Question Bank. Electric Circuits, Resistance and Ohm s Law

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Question Bank. Electric Circuits, Resistance and Ohm s Law"

Transcription

1 Electric Circuits, Resistance and Ohm s Law. Define the term current and state its SI unit. Ans. The rate of flow of charge in an electric circuit is called current. Its SI unit is ampere. 2. (a) Define Ampere. (b) Calculate the current flowing in ampere, if a charge of 5000 C flows through a circuit in 20 minutes. Ans. (a) When one coulomb of charge flows through a conductor in one second, then the current flowing through the circuit is said to be one ampere. Q 5000 C 5000 C (b) Current (I) = = = =4.6A t 20 min 200 s 3. Define the term potential. State its SI unit. Ans. The amount of work done (energy spent) in moving a unit positive charge from infinity to a given point in an electric field is called electric potential. The SI unit of electric potential is volt (V). 4. (a) Define Volt. (b) 4000 J of work is done in bringing 600 C of charge from infinity to a given point A in an electric field. Calculate the potential at point A.

2 Ans. (a) When one coulomb electric charge is brought from infinity to a given point in an electric field, such that work done is joule, then the electric potential at that point is one volt. Work done (b)electric potential = = 4000 J Charge 600 C = 2.5 V 5. How is potential difference between two points defined? State its SI unit. Ans. The amount of work done in moving a unit charge (say positive) from one point to another point in an electric field is called potential difference (p.d.). Unit of potential difference in SI system is volt (V). 6. Explain the statement the potential difference between two points is volt. Ans. From the above statement it implies that when a unit charge ( coulomb) is moved between the two points in an electric field then the amount of work done is one joule. 7. (a) Define the term electric resistance and state its practical unit. (b) Define the unit of resistance named in (a). (c) How does the resistance of following conductors change with the rise in temperature? () Tungsten wire, (2) German silver, (3) Carbon rod. Ans. (a) The opposition offered by a conductor, to the passage of drifting electrons is called electric resistance. Its practical unit is ohm. (b) When a current of A flows through a conductor, whose ends are maintained at a p.d. of volt, then the resistance of conductor is one ohm. (c) () The resistance of tungsten increases with the rise in temperature. (2) The resistance of German silver does not increase appreciably with the rise in temperature. (3) The resistance of carbon rod decreases with the rise in temperature. 2

3 8. State laws of electric resistance and write an expression in terms of length and area of cross-section. Ans. (i) The resistance of a conductor is directly proportional to length. (ii) The resistance of a conductor is inversely proportional to its area of crosssection. Expression : R = l, where ρ is the specific resistance of a conductor. a 9. (a) What do you understand by the term specific resistance? (b) What is the effect on specific resistance with the change in temperature? (c) State the SI unit of specific resistance. Ans. (a) The resistance offered by a conductor of unit length and unit area of crosssection, such that the current enters and leaves the conductor from its opposite faces, is called specific resistance. (b) The specific resistance does not change with the rise in temperature. (c) The SI unit of specific resistance is ohm-metre (Ω-m). 0. State two differences between resistance and specific resistance. Ans.(i) The resistance of conductor changes with the change in length, area of crosssection, temperature, etc, but the specific resistance of a conductor is a constant quantity. (ii) The resistance is measured in ohm, whereas specific resistance is measured in ohm-m. 3

4 . Two wires, one of copper and other of iron have same length and same radius. Which wire has more resistance? Ans. Iron wire will have more resistance than copper wire, because the specific resistance of iron wire is more than copper wire. 2. (a) What do you understand by terms : (i) Electric circuit, (ii) Series circuit? (b) State three characteristics of series circuit. Ans. (a) (i) A continuous conducting path, between the terminals of source of electricity (such as cell or battery) is called electric circuit. (ii) When a number of resistors are connected end to end, such that tail of one resistor is connected to initial end of other resistor, so as to form closed electrical circuit, then such a circuit is called series circuit. (b)(i) The current in series circuit is a constant quantity. (ii) There is a continuous drop in potential all along in series circuit, but potential difference goes on increasing. (iii) Total p.d in series circuit is equal to the sum total of p.d across the terminals of individual resistors : V = V + V2 + V3. 4

5 3. What do you understand by the term parallel circuit? State its three characteristics. Ans. When a number of resistors are connected such that they have a common positive and a common negative terminal, then resistors are said to be in parallel circuit. (a) The p.d. in a parallel circuit is a constant quantity. (b) The current divides in parallel circuit in the inverse ratio of the resistances. (c) Total current flowing through a parallel circuit is equal to the sum total of current flowing through the individual resistors. I = I + I2 + I3. 4. State Ohm s law. Ans. Ohm s Law : All physical conditions of a conductor remaining the same, the current flowing through it is directly proportional to potential difference at its ends. 5. Draw a neat circuit diagram for the verification of Ohm s law by voltmeterammeter method. By another diagram show the relation between p.d. and current. Ans. 5

6 6. Draw a neat diagram for the verification of Ohm s law by potentiometer method. Show the relation between p.d. and the length of conductor. Ans. 7. (a) What do you understand by the term ohmic resistance? Give two examples. (b) What do you understand by the term non-ohmic resistance? Give two examples. Ans. (a) A resistor, which obeys Ohm s law, is said to have ohmic resistance. Examples : Tungsten filament; nichrome wire. (b) A resistor, which does not obey Ohm s law, is said to have non-ohmic resistance. Examples : Electronic valve; armature of electric motor. 6

7 8. Which amongst the following is an ohmic resistance? (i) Diode, (ii) Diamond, (iii) Germanium and (iv) Nichrome. Ans. Nichrome is an ohmic resistance. 9. Figures (a), (b), (c) and (d) below shows I V characteristic curves for same resistors. Identify the ohmic and non-ohmic resistors and give a reason for your answer. Ans.(a), (b) an (c) are non-ohmic resistors. It is because the V I as the curves are not a straight line. (d) is an ohmic resistance as V I and the curve is a straight line. 20. Write an expression connecting the resistance and resistivity. State the meaning of symbols used. Ans. R =ρ. l a R is resistance in ohm, ρ is the resistivity (sp. resistance) of conductor, l is the length of the conductor and a the area of cross-section of the conductor. 2. State the S.I. unit of resistivity (sp. resistance). Ans. The SI unit of resistivity is ohm-metre (Ω-m). 7

8 22. State the order of resistivity of : (i) metals, (ii) semi-conductors and (iii) insulators. Ans. The order of resistivity of metals is of the order of 0 8 ohm-metre. The order of resistivity of semiconductors is of the order of 0 5 ohm-metre. The order of resistivity of insulators is of the order of 08 to 06 ohm-metre. 23. Two wires of same material and same length have radii r and r 2 respectively. Compare their (a) resistances, (b) resistivities. Ans. (i) The resistance of wire Area of cross-section (Radius) 2 resistance of wires will be in the ratio of : r r (ii) As the material of the wires does not change, therefore, specific resistance does not change. Ratio of resistivities of the wire will be :. 24. A given wire is stretched to double its length. How will its resistance change? Give a reason for your answer. Ans. As the length of wire doubles the area of the wire becomes half. Now, the resistance of wire is inversely proportional to the square of the radius, therefore, the resistance will increase four times. 8

9 25. Name the material used for making the connection wires. Give a reason for your answer. Ans. Copper is the material commonly used for making connection wires on account of its very low specific resistance. 26. Name the material used for making standard resistors. Give a reason for your answer. Ans. Constantan or Eureka is used for making standard resistors. It is because, these materials offer appreciable amount of resistance, which does not change with the moderate rise in temperature. 27. What is a super conductor? Give two examples. Ans. A material which does not offer any electrical resistance when cooled below certain temperature, is called super conductor. Examples : () Mercury when cooled below 4.2 K, becomes super conductor. (2) Ceramic materials containing small amount of lanthanium and barium becomes super conductor, when cooled below 35 K. 28. (a) What do you understand by the term internal resistance of cell? (b) How is internal resistance of cell affected with change in (i) surface area of electrodes in contact with electrolyte? (ii) distance between the electrodes? (iii) concentration of electrolyte? (iv) temperature of electrolyte? 9

10 Ans. (a) The resistance offered by the electrolyte of a cell is called internal resistance. (b) (i) The internal resistance of cell is inversely proportional to the surface area of electrodes in contact with electrolyte. (ii) The internal resistance of cell is directly proportional to the distance between electrodes. (iii) The internal resistance of cell increases with the concentration of electrolyte. (iv) The internal resistance of cell decreases with the rise in temperature. 29. Explain the meaning of terms e.m.f. and terminal voltage of a cell. Ans. e.m.f. : When no current is drawn from the cell, i.e., when the cell is in open circuit, the potential difference between its terminals is called e.m.f. Terminal Voltage : When the current is drawn from a cell, i.e., when the cell is in closed circuit, the potential difference between its terminals is called terminal voltage. 30. A high resistance voltmeter is connected in parallel to the terminals of cell which shows emf E. The cell is connected to an external circuit through a switch and rehostat. When the current in the external circuit is gradually increased, the reading of voltmeter drops. Explain. Ans. Drop in potential is given by the expression : Drop in potential = (E V) = Ir. Now as the magnitude of I increases, so does the expression Ir. Thus, the drop in potential also increases. This results in the drop in reading in voltmeter. 0

11 3. Differentiate between e.m.f. and terminal voltage of a cell. e.m.f. of cell. It is the measure of amount of work done in moving a unit positive charge in a complete electrical circuit, inside and outside the cell. 2. It is the characteristic of the cell i.e., it does not depend on the amount of current drawn from the cell. 3. It is a constant quantity for a given cell. Terminal voltage of cell. It is the measure of amount of work done in moving a unit positive charge in an electrical circuit, outside the cell 2. It depends upon the amount of current drawn from the cell. More is the current drawn from the cell, less is the terminal voltage. 3. It is a variable quantity and depends upon the external resistance.

12 Numerical Problems.. A wire of resistance 4.5 Ω and length.5 m has area of cross-section of 0.04 cm2. Calculate the specific resistance of wire. Ans. R = 4.5 Ω; l =.5 m = 50 cm; a = 0.04 cm2; ρ =? Ra ρ = = =0.002 Ω cm.. l A wire of length 40 cm and area of cross-section 0. mm2 has a resistance of 0.8 Ω. Calculate the specific resistance of the wire. Ans. l = 40 cm; a = 0. mm2 = 0.00 cm2; R = 0.8 Ω; ρ =? Ra ρ = = = Ω cm. l A conductor of length 85 cm has a resistance of 3.75 Ω. Calculate the resistance of a similar conductor of length 540 cm. Ans. l = 85 cm; R = 3.75 Ω; l2 = 540 cm; R2 =? R R l R 2 = R2 = 2 l2 l R2 = = Ω. 85 l 2

13 4. A resistance wire made of German silver has resistance of 4.25 Ω. Calculate the resistance of another wire made from the same material, such that its length increases four times and the area of cross-section decreases three times. Ans.Case (i) : Let l be the length of wire and a the area of cross-section l ρl R = ρ or 4.25 = (i) a a a Case (ii) : Length of wire = 4l; area of cross-section of wire = 3 4l R = ρ a /3 2 ρl or R = ρ (ii) a Dividing (ii) by (i) R 2ρl a = 4.25 a ρl R = = 5 Ω. 5. (a) A metallic wire has a resistance of 2 ohms per metre. Find the total resistance of two lengths of this wire, each.5 m long and connected in parallel. (b) What will be the resistance of 4 m of a wire of same material, but twice the area of cross-section? Ans.(a) Resistance of.5 m of wire = 2.5 = 3 Ω Resistance of two.5 m wires in parallel, 3

14 = + = 2 R R= =.5 Ω 2 (b) Resistance of 4 m wire = 4 2 = 8 Ω 8 Ω = 4 ρ a (i) When the area of cross-section of wire doubles, Dividing (ii) by (i) R 4 = ρ (ii) 2a R 4 a = ρ 8Ω 2a ρ 4 R= 8 2 = 4 Ω. 6. A nichrome wire of length l and area of cross-section a/4 has a resistance R. Another nichrome wire of length 3l and area of cross-section a/2 has resistance R. Find the ratio R : R. Ans. Case (i) : Length = l; Area of cross-section = a/4; Resistance = R ρl 4ρl R = = a/4 a Case (ii) : Length of wire = 3l; (i) Area of cross-section of wire = a/2; Resistance = R 4

15 ρ 3l 6ρl R= =...(ii) a/2 a R : R = 6 ρl : 4 ρ l = 6 : 4 = 3 : 2. a a 7. Three resistors of 6 Ω, 3 Ω. and 2 Ω are connected together, such that their total resistance is greater than 6 Ω, but less than 8 Ω. Draw a diagram to show this arrangement and calculate total resistance. Ans. Equivalent resistance of 3 Ω and 2 Ω in parallel 5 6 = + = R = =.2Ω R Resistance of circuit = 6 Ω +.2 Ω = 7.2 Ω. 8. Calculate the equivalent resistance of resistors r ; r 2 ; r 3 and r 4. Ans. Equivalent resistance of r 3 and r 4 in parallel R r + r r r = + = R = r3 r4 r3 r4 r4 + r 3 Equivalent resistance of r, r 2 and R in series R = r + r 2 + r r r r 4 3 5

16 9. Diagram below shows a network of five resistances. Calculate the resistance between points X and Y. Ans. Equivalent resistance of 3 Ω and 2 Ω in series = = 5 Ω. Equivalent resistance of two 5 Ω resistances parallel with Ω resistance and 2 Ω and 3 Ω are in series (3 + 2 = 5 Ω) = + + = 7 R R = = 0.7Ω 7 0. The diagram below shows resistors of 3Ω, in a network. Calculate the equivalent resistance : (i) Between points P and Q. (ii) Between points X and Y. Ans.(i) Equivalent resistance of PA and QA in series; 6

17 R = 3 Ω + 3 Ω = 6 Ω. Equivalent resistance of R in parallel with PQ; R 2 3 = + = = R2 = 2 Ω Resistance between points P and Q = 2 Ω (ii) Equivalent resistance of XP; R2 and YQ in series = 3 Ω + 2 Ω + 3 Ω = 8 Ω.. Equivalent resistance of circuit diagram is 6 Ω.. Calculate the value of x. Ans. Equivalent resistance of 8 Ω; 9Ω and x in series, R = 8 Ω + 9 Ω + x = 7 Ω + x Equivalent resistance of 3 Ω and 5 Ω in series R2 = 3 Ω + 5 Ω = 8 Ω Equivalent resistance of R and R2 in parallel x 25 + x = + = = R 7 + x 8 8 (7 + x) x x R = 25 + x 7

18 Also, equivalent resistance of circuit = 6Ω x 6 = 25 + x Or x = x 2x = 4 x = 7 Ω. 2. Equivalent resistance of circuit diagram is 5Ω. Calculate the value of x. Ans. Equivalent resistance of resistances in parallel x+ 6+ 3x 4x+ 6 = + + = = R 6 x 2 6x 6x 6x R = 4x + 6 Equivalent resistance of R in series with 4 Ω 6x 6x x R = 4+ = 4x+ 6 4x+ 6 = 22x x + 6 Also, equivalent resistance of circuit, R = 5 Ω 8

19 22x x + 6 = 5 22x + 24 = 20x x = 6 x = 3 Ω. 3. A current of 0.2 A flows through a conductor of resistance 4.5 Ω. Calculate the p.d. at the ends of conductor. Ans. I = 0.2 A; R = 4.5 Ω; V =? V = I.R = = 0.9 V. 4. A bulb of resistance 400 Ω is connected to 200 V mains. Calculate the magnitude of current. Ans. R = 400 Ω; V = 200 V; I =? I V 200 = = =0.5A R An electric heater draws a current of 5 A, when connected to 220 V mains. Calculate the resistance of its filament. Ans. I = 5 A; V = 220 V; R =? V 200 R= = = 44Ω. I 5 6. The figure below, shows a circuit diagram having a battery of 24 V and negligible internal resistance. Calculate : (i) Reading of ammeter, (ii) Reading recorded by V; V2 and V3. 9

20 Ans. (i) Equivalent resistance of 3 Ω and 6 Ω in parallel. 3 = + = = R R = 2 Ω. Total external resistance in series, e.m.f. of cell = 24 V. R =.5 Ω + 2 Ω Ω = 2 Ω. Reading of ammeter I = V R = 24 2 = 2 A. (ii) As all the resistors are in series, therefore current in each of them is 2A. p.d. across.5 Ω resistor, V = I.R = 2.5 = 3V. p.d. across R resistor, V2 = I.R = 2 2 = 4 V. p.d. across 8.5 Ω resistor, V3 = I.R = = 7 V. 20

21 7. Two cells, each having e.m.f of 2 V and internal resistance.5 Ω are connected in parallel. The arrangement is then connected to 4.25 Ω resistor. Calculate the current flowing through 4.25 Ω resistor. Ans. e.m.f. of one cell = 2 V. e.m.f. of two cells in parallel = 2V [ p.d. in parallel is a constant quantity.] Internal resistance of one cell =.5 Ω Internal resistance of two cells in parallel 2 r = =.5 r =.5 2 = 0.75 Ω External resistance = 4.25 Ω Current in circuit, E 2 I = R + r = = I = 0.4 A. 8. Figure given below shows a circuit diagram, having a battery of 9 V and internal resistance 0.6 Ω connected to three resistors A, B and C. Calculate the current in each resistor. 2

22 Ans. e.m.f. of battery = 9V Internal resistance of battery = 0.6 Ω Equivalent resistance of 4 Ω and 6 Ω in parallel, = + = = R R = 2 5 = 2.4 Ω Total external resistance R in series Current in main circuit I = = 2 Ω Ω = 4.4 Ω E A R+ r = = 5 = Current in A (which is in series) =.8 A p.d. across B and C, V = IR = = 4.32 V Current in B, I = V = 4.32 =.08 A. R 4 Current in C, I2 = V = 4.32 = 0.72 A. R 6 9. Four cells each of e.m.f. 2V and internal resistance 0. Ω are connected in series. The combination in series is connected to an ammeter of negligible resistance,.6 Ω resistor and an unknown resistor R. The current in the circuit is 2A. Draw a labelled circuit diagram for the above arrangement and calculate : (i) Total resistance in the circuit, (ii) Total e.m.f., (iii) Value of R, (iv) p.d. across R. 22

23 Ans. (i) Internal resistance of four cells in series = 4 0. = 0.4 Ω External resistance =.6 Ω + R Total resistance in circuit = int. resistance + ext. resistance = 0.4 Ω +.6 Ω + R = 2.0 Ω + R. (ii) Total e.m.f of four cells in series = 4 2 = 8 V. (iii) E I= R 8 2= 2+R 4 + 2R = 8 R = 2 Ω. (iv) p.d across R, V = I.R = 2 2 = 4 V. 23

24 20. A cell of e.m.f..5 V and internal resistance 0.3 Ω is connected to a set of two resistances of 2 Ω and 3 Ω in parallel. Draw a labelled circuit diagram, showing the above arrangement, and calculate the current drawn from the cell. Ans. Equivalent resistance of 3 Ω and 2 Ω in parallel = + = 5 R R = =.2Ω 5 Current drawn from cell. E.5.5 I= A. R + r = =.5 = 2. Figure below is a circuit diagram in which three resistors of Ω, 2Ω and 3Ω are connected to a cell of e.m.f. 2V and internal resistance 0.5 Ω. (i) Calculate the total resistance of the circuit. (ii) What is the reading of the ammeter? 24

25 (iii) What will be the reading of ammeter, if an exactly similar cell is connected in series, with the given cell? Ans.(i) Equivalent resistance of Ω and 2 Ω in series, R = + 2 = 3 Ω. Equivalent resistance of R in parallel with 3 Ω = + = 2 R R2 = = Ω Total resistance in circuit 2 = int. resistance + ext. resistance = 0.5Ω +.5Ω = 2.0Ω (ii) Reading of ammeter, Total e.m.f 2 I= = = A. Total Resistance 2 (iii) New e.m.f. of cells= 2 2 = 4 V New internal resistance of cells = = Ω. Ext. resistance =.5 Ω Total resistance in circuit = +.5 = 2.5 Ω New reading of ammeter, Total e.m.f 4 I= = =.6 A. Total Resistance

26 22. Four cells, each of e.m.f. 2V and internal resistance 0.2 Ω are connected in series to form a battery. The battery is connected to an ammeter, a resistance of.2 Ω and a set of three resistances of 4 Ω; 6 Ω and 2 Ω in parallel, so as to complete an overall circuit in series. (i) Draw the circuit diagram of the arrangement. (ii) Calculate current recorded by ammeter. (iii) Calculate current flowing in 6 Ω wire (iv) Calculate p.d. across.2 Ω wire (v) Calculate drop in potential across the terminals of battery. Ans. (i) The figure is shown below. (ii) e.m.f. of four cells in series, E = 4 2 = 8 V. Internal resistance of four cells in series, r = = 0.8 Ω Equivalent external resistance of parallel circuit 6 = = R R = 2Ω Total external resistance = (2.2) = 3.2 Ω. 26

27 Current recorded by ammeter, E 8 8 I= 2A. R+ r = = 4 = (iii) p.d. across parallel circuit, V = IR = 2 2 = 4 V. Current in 6 Ω wire, I = V = 4 = 0.67 A. R 6 (iv) p.d. across.2 Ω wire V= IR = 2.2 = 2.4 V. (v) Drop in potential across terminals of battery, (E V) = Ir = =.6 V. 23. Two cells, each of e.m.f..5v and internal resistance Ω are connected in parallel to form a battery. The battery is connected to an external resistance of 0.5 Ω and two resistances of 3 Ω and.5 Ω in parallel. (i) Draw the circuit diagram (ii) Calculate the current in main circuit (iii) Calculate the current in.5ω resistor (iv) Calculate the drop in potential across the terminals of battery. Ans. (i) e.m.f of 2 cells in parallel =.5 V Internal resistance of two cells in parallel, 2 = + = r r = = 0.5 Ω 2 27

28 External resistance of 3 Ω and.5 Ω in parallel, + 2 = + = R R = Ω Total external resistance = =.5 Ω Current in main circuit, E.5.5 I= = = R + r = 0.75 A. (iii) p.d. across parallel circuit, V = IR = 0.75 = 0.75 V Current in.5 Ω resistor, V 0.75 I= = = 0.50 A. R.5 Drop in potential across terminals of battery : E V = Ir = = V. 28

29 24. The given figure is a circuit diagram, such that a current of A flows through the circuit, when p.d. recorded at the ends of parallel resistors is.0 V. Calculate the values of R and r. Ans. (i) Current in main circuit =.0 A p.d. at the ends of parallel resistors =.0 V Current in 3 Ω resistor, I = V = R 3 A Current in R = = 2 A 3 3 Resistance of resistor V 3 R= = = I 2/3 2 =.5 Ω. Resistance of parallel circuit, 3 = + = = R R = Ω E I = R + r =.5 + r or + r =.5 r = 0.5 Ω. 29

30 25. A cell of e.m.f..8 V is connected to an external resistance of 2 Ω when p.d. recorded at the ends of resistance is.6 V. Calculate the internal resistance of cell. Ans. E =.8 V; R = 2 Ω; V =.6 V; r =? R(E V) 2(.8.6) r = = = =0.25 Ω. V A cell when connected to an external resistance of 4.5 Ω, shows a p.d. of.35 V. If 4.5 Ω resistance is replaced by 2.5 Ω resistance, the p.d. drops to.25 V. Calculate the value of e.m.f. and internal resistance of the cell. Ans. Let E be the e.m.f. and r the internal resistance. Case (i) Case (ii) Comparing (i) and (ii) 4.5(E.35) r = (i) (E.25) r = (ii) (E.35) 2.5 (E.25) = (E.35) 2 (E.25) = 3.33E 4.5 = 2E E = 2 2 E=.33 E =.50 V 30

31 Substituting the value of E in (ii) 2.5 (.5.25) r =.25 =2 0.25= 0.5 Ω. 3

OHM S LAW 05 AUGUST 2014

OHM S LAW 05 AUGUST 2014 OHM S LAW 05 AUGUST 2014 In this lesson, we: Current Lesson Description Revise the definitions of current, potential difference and emf Explore Ohm s law Identify the characteristics of ohmic and non-ohmic

More information

Objectives 200 CHAPTER 4 RESISTANCE

Objectives 200 CHAPTER 4 RESISTANCE Objectives Explain the differences among conductors, insulators, and semiconductors. Define electrical resistance. Solve problems using resistance, voltage, and current. Describe a material that obeys

More information

Electrostatics. Electrostatics Version 2

Electrostatics. Electrostatics Version 2 1. A 150-watt lightbulb is brighter than a 60.-watt lightbulb when both are operating at a potential difference of 110 volts. Compared to the resistance of and the current drawn by the 150-watt lightbulb,

More information

Electric Currents. Electric Potential Energy 11/23/16. Topic 5.1 Electric potential difference, current and resistance

Electric Currents. Electric Potential Energy 11/23/16. Topic 5.1 Electric potential difference, current and resistance Electric Currents Topic 5.1 Electric potential difference, current and resistance Electric Potential Energy l If you want to move a charge closer to a charged sphere you have to push against the repulsive

More information

Science AS90191 Describe Aspects of Physics.

Science AS90191 Describe Aspects of Physics. Circuits and components Science AS90191 Describe Aspects of Physics. An electric current is the movement of electrons (negatively charged particles). A circuit is made up of components connected together

More information

STUDY MATERIAL FOR CLASS 10+2 - Physics- CURRENT ELECTRICITY. The flow of electric charges in a particular direction constitutes electric current.

STUDY MATERIAL FOR CLASS 10+2 - Physics- CURRENT ELECTRICITY. The flow of electric charges in a particular direction constitutes electric current. Chapter : 3 Current Electricity Current Electricity The branch of Physics which deals with the study of electric charges in motion is called current electricity. Electric current The flow of electric charges

More information

1) 10. V 2) 20. V 3) 110 V 4) 220 V

1) 10. V 2) 20. V 3) 110 V 4) 220 V 1. The diagram below represents an electric circuit consisting of a 12-volt battery, a 3.0-ohm resistor, R 1, and a variable resistor, R 2. 3. What is the total resistance of the circuit 1) 6.6 Ω 2) 10

More information

[2]...[1] [3]

[2]...[1] [3] High Demand Questions QUESTIONSHEET 1 (a) In the circuit below, lamps P and Q are identical. The reading on the ammeter is 3A. The cell shown is of emf. 6V. A P Q Calculate the current that passes through

More information

Series and Parallel Circuits

Series and Parallel Circuits Series and Parallel Circuits Components in a circuit can be connected in series or parallel. A series arrangement of components is where they are inline with each other, i.e. connected end-to-end. A parallel

More information

7. What is the current in a circuit if 15 coulombs of electric charge move past a given point in 3 seconds? (1) 5 A (3) 18 A (2) 12 A (4) 45 A

7. What is the current in a circuit if 15 coulombs of electric charge move past a given point in 3 seconds? (1) 5 A (3) 18 A (2) 12 A (4) 45 A 1. Compared to the number of free electrons in a conductor, the number of free electrons in an insulator of the same volume is less the same greater 2. Most metals are good electrical conductors because

More information

Saturday X-tra X-Sheet: 19. Electric circuits

Saturday X-tra X-Sheet: 19. Electric circuits Saturday X-tra X-Sheet: 9 Key Concepts Electric circuits This lesson focuses on the following: Potential Difference Current The resistance of a conductor Ohm s Law and circuit calculations Terminology

More information

A) The potential difference across the 6-ohm B) 2.0 A resistor is the same as the potential difference across the 3-ohm resistor. D) 4.

A) The potential difference across the 6-ohm B) 2.0 A resistor is the same as the potential difference across the 3-ohm resistor. D) 4. 1. A 2.0-ohm resistor and a 4.0-ohm resistor are connected in series with a 12-volt battery. If the current through the 2.0-ohm resistor is 2.0 amperes, the current through the 4.0-ohm resistor is A) 1.0

More information

Chapter 11- Electricity

Chapter 11- Electricity Chapter 11- Electricity Course Content Definition of Electricity Circuit Diagrams Series and Parallel Circuits Calculating total resistances Measurement of Electricity Ammeters and Voltmeters Ohm s Law

More information

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 1 - D.C. CIRCUITS

EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME 1 - D.C. CIRCUITS EDEXCEL NATIONAL CERTIFICATE/DIPLOMA UNIT 5 - ELECTRICAL AND ELECTRONIC PRINCIPLES NQF LEVEL 3 OUTCOME - D.C. CIRCUITS Be able to use circuit theory to determine voltage, current and resistance in direct

More information

EMF & INTERNAL RESISTANCE 28 JULY 2015 Section A: Summary Notes

EMF & INTERNAL RESISTANCE 28 JULY 2015 Section A: Summary Notes EMF & INTERNAL RESISTANCE 28 JULY 2015 Section A: Summary Notes Internal Resistance The emf of a cell is the maximum amount of energy which the cell can supply. When the cell is delivering current, the

More information

Electricity CHAPTER 12 12.1 ELECTRIC CURRENT AND CIRCUIT

Electricity CHAPTER 12 12.1 ELECTRIC CURRENT AND CIRCUIT CHAPTER 12 Electricity Electricity has an important place in modern society. It is a controllable and convenient form of energy for a variety of uses in homes, schools, hospitals, industries and so on.

More information

Current and resistance

Current and resistance Current and resistance Electrical resistance Voltage can be thought of as the pressure pushing charges along a conductor, while the electrical resistance of a conductor is a measure of how difficult it

More information

Q1. (a) Complete the sentence below to name the instrument used to measure electrical current.

Q1. (a) Complete the sentence below to name the instrument used to measure electrical current. Q. (a) Complete the sentence below to name the instrument used to measure electrical current. The instrument used to measure electrical current is called... () (b) In the diagram below each box contains

More information

Level 2 Physics: Demonstrate understanding of electricity and electromagnetism

Level 2 Physics: Demonstrate understanding of electricity and electromagnetism Level 2 Physics: Demonstrate understanding of electricity and electromagnetism Static Electricity: Uniform electric field, electric field strength, force on a charge in an electric field, electric potential

More information

Chapter 18 Electric Current and Circuits

Chapter 18 Electric Current and Circuits Chapter 18 Electric Current and Circuits 3. When a current flows down a wire: A. electrons are moving in the direction of the current. B. electrons are moving opposite the direction of the current. C.

More information

Meters - Ohm s Law R 2 R 1 APPARATUS INTRODUCTION R 1 R 2 A

Meters - Ohm s Law R 2 R 1 APPARATUS INTRODUCTION R 1 R 2 A Meters - Ohm s Law APPARATUS 1. Board on which two wires are mounted, each 1 m long, equipped with a sliding contact 2. Rheostat (variable resistance), 0... 7 Ω 3. DC ammeter (full scale: 2 A) 4. Voltmeter

More information

Electricity Review-Sheet

Electricity Review-Sheet Name: ate: 1. The unit of electrical charge in the MKS system is the. volt. ampere. coulomb. mho 2. Which sketch best represents the charge distribution around a neutral electroscope when a positively

More information

PHYSICS REFERENCE STUDY MATERIAL. for. Summative Assessment -I CLASS X 2014 15 CHAPTER WISE CONCEPTS, FORMULAS AND NUMERICALS INLCUDING HOTS PROBLEMS

PHYSICS REFERENCE STUDY MATERIAL. for. Summative Assessment -I CLASS X 2014 15 CHAPTER WISE CONCEPTS, FORMULAS AND NUMERICALS INLCUDING HOTS PROBLEMS PHYSICS REFERENCE STUDY MATERIAL for Summative Assessment -I CLASS X 2014 15 CHAPTER WISE CONCEPTS, FORMULAS AND NUMERICALS INLCUDING HOTS PROBLEMS Prepared by M. S. KUMARSWAMY, TGT(MATHS) M. Sc. Gold

More information

physics 112N current, resistance and dc circuits

physics 112N current, resistance and dc circuits physics 112N current, resistance and dc circuits current! previously we considered electrostatic situations in which no E-field could exist inside a conductor! now we move to the case where an electric

More information

Circuits-Circuit Analysis

Circuits-Circuit Analysis Base your answers to questions 1 through 3 on the information and diagram below. 4. A 9-volt battery is connected to a 4-ohm resistor and a 5-ohm resistor as shown in the diagram below. A 3.0-ohm resistor,

More information

MC Electricity Resistors Review

MC Electricity Resistors Review 2. In the circuit shown above, what is the value of the potential difference between points X and Y if the 6 volt battery has no internal resistance? (A) 1 V (B) 2 V (C) 3 V (D) 4 V (E) 6V 8. The circuit

More information

CHAPTER12. Electricity. Multiple Choice Questions. Fig. 12.1

CHAPTER12. Electricity. Multiple Choice Questions. Fig. 12.1 CHAPTER12 Electricity Multiple Choice Questions 1. A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure12.1. The current recorded in the ammeter will be Fig. 12.1

More information

Electric circuits, Current, and resistance (Chapter 22 and 23)

Electric circuits, Current, and resistance (Chapter 22 and 23) Electric circuits, Current, and resistance (Chapter 22 and 23) Acknowledgements: Several Images and excerpts are taken from College Physics: A strategic approach, Pearson Education Inc Current If electric

More information

TOPIC 3.1: ELECTRIC CIRCUITS

TOPIC 3.1: ELECTRIC CIRCUITS TOPIC 3.1: ELECTRIC CIRCUITS S4P-3-1 S4P-3-2 S4P-3-3 S4P-3-4 S4P-3-5 S4P-3-6 Describe the origin of conventional current and relate its direction to the electron flow in a conductor. Describe the historical

More information

Capacitance, Resistance, DC Circuits

Capacitance, Resistance, DC Circuits This test covers capacitance, electrical current, resistance, emf, electrical power, Ohm s Law, Kirchhoff s Rules, and RC Circuits, with some problems requiring a knowledge of basic calculus. Part I. Multiple

More information

Circuits. Page The diagram below represents a series circuit containing three resistors.

Circuits. Page The diagram below represents a series circuit containing three resistors. Name: Circuits Date: 1. Which circuit segment has an equivalent resistance of 6 ohms? 4. The diagram below represents a series circuit containing three resistors. 2. Base your answer to the following question

More information

CLASS TEST GRADE 11. PHYSICAL SCIENCES: PHYSICS Test 3: Electricity and magnetism

CLASS TEST GRADE 11. PHYSICAL SCIENCES: PHYSICS Test 3: Electricity and magnetism CLASS TEST GRADE 11 PHYSICAL SCIENCES: PHYSICS Test 3: Electricity and magnetism MARKS: 45 TIME: 1 hour INSTRUCTIONS AND INFORMATION 1. Answer ALL the questions. 2. You may use non-programmable calculators.

More information

Unit 7: Electric Circuits

Unit 7: Electric Circuits Multiple Choice Portion 1. The diagram below shows part of an electrical circuit. Unit 7: Electric Circuits 4. A 12 V battery supplies a 5.0 A current to two light bulbs as shown below. What are the magnitude

More information

Ch. 20 Electric Circuits

Ch. 20 Electric Circuits Ch. 0 Electric Circuits 0. Electromotive Force Every electronic device depends on circuits. Electrical energy is transferred from a power source, such as a battery, to a device, say a light bulb. Conducting

More information

Chapter 13: Electric Circuits

Chapter 13: Electric Circuits Chapter 13: Electric Circuits 1. A household circuit rated at 120 Volts is protected by a fuse rated at 15 amps. What is the maximum number of 100 watt light bulbs which can be lit simultaneously in parallel

More information

Q1. (a) The diagram shows the voltage-current graphs for three different electrical components.

Q1. (a) The diagram shows the voltage-current graphs for three different electrical components. Q. (a) The diagram shows the voltage-current graphs for three different electrical components. Which one of the components A, B or C could be a 3 volt filament lamp? Explain the reason for your choice...................

More information

Experiment #3, Ohm s Law

Experiment #3, Ohm s Law Experiment #3, Ohm s Law 1 Purpose Physics 182 - Summer 2013 - Experiment #3 1 To investigate the -oltage, -, characteristics of a carbon resistor at room temperature and at liquid nitrogen temperature,

More information

AP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules

AP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules Name Period AP Physics Electricity and Magnetism #4 Electrical Circuits, Kirchoff s Rules Dr. Campbell 1. Four 240 Ω light bulbs are connected in series. What is the total resistance of the circuit? What

More information

Ohm s Law & Series Circuit

Ohm s Law & Series Circuit Open the TI-Nspire document Ohms_Law_&_Series_Circuit.tns. We all use and rely on electric circuits every day by flipping a switch, turning up the volume, or operating a computer or calculator. Even the

More information

The diagram shows a negatively charged plastic rod held near to a thin stream of water. The water is attracted towards the rod.

The diagram shows a negatively charged plastic rod held near to a thin stream of water. The water is attracted towards the rod. Current electricity exam qs C grade Madeley High School Q.(a) The diagram shows a negatively charged plastic rod held near to a thin stream of water. The water is attracted towards the rod. Which one of

More information

Chapter 12: Current Electricity

Chapter 12: Current Electricity Chapter 12: Current Electricity And God said, Let there be light and there was light, but the electricity board said He would have to wait until Thursday to be connected. Spike Milligan Objectives 1. Define

More information

What will we learn in this chapter?

What will we learn in this chapter? Chapter 19: Current, resistance, circuits What will we learn in this chapter? What are currents? Resistance and Ohm s law (no, there are no 3 laws). Circuits and electric power. Resistors in series and

More information

EE301 RESISTANCE AND OHM S LAW

EE301 RESISTANCE AND OHM S LAW Learning Objectives a. Describe the concept of resistance b. Use Ohm s law to calculate current, voltage, and resistance values in a circuit c. Discuss the difference between an open circuit and a short

More information

CURRENT ELECTRICITY PREVIOUS EAMCET QUESTIONS ENGINEERING

CURRENT ELECTRICITY PREVIOUS EAMCET QUESTIONS ENGINEERING Current lectricity CUNT LCTICITY PVIOUS AMCT QUSTIONS NGINING. In the circuit shown below, a voltmeter of internal resistance, when connected across B and C reads 00/ volts. Neglecting the internal resistance

More information

MAGNETISM AND ELECTRICITY

MAGNETISM AND ELECTRICITY WEEK 19 MAGNETISM AND ELECTRICITY ELECTRIC CIRCUITS. 1 Resistance: After this lesson, you should be able to do the following: Know how to define resistance. Know what resistance is. Know the unit for resistance.

More information

B. 1.3 Ω D Ω (Total 1 mark)

B. 1.3 Ω D Ω (Total 1 mark) Practice Test: 30 marks (39 minutes) Additional Problem: 5 marks (37 minutes) 1. One electronvolt is equal to A. 1.6 10 19 C. B. 1.6 10 19 J. C. 1.6 10 19 V. D. 1.6 10 19 W.. In the circuit below, which

More information

CURRENT ELECTRICITY OHM S LAW KIRCHHOFF S LAW

CURRENT ELECTRICITY OHM S LAW KIRCHHOFF S LAW CURRENT ELECTRICITY OHM S LAW KIRCHHOFF S LAW 1 01. A current of 16mA flows through a conductor. The number of electrons flowing per second is, (1) 10 14 (2) 10 15 (3) 10-17 (4) 10 17 2 Solution (1):-

More information

CURRENT ELECTRICITY - I

CURRENT ELECTRICITY - I CURRNT LCTRCTY - 1. lectric Current 2. Conventional Current 3. Drift elocity of electrons and current 4. Current Density 5. Ohm s Law 6. Resistance, Resistivity, Conductance & Conductivity 7. Temperature

More information

Chapter 13 Electric Circuits

Chapter 13 Electric Circuits Chapter 13 Electric Circuits What is Electric Current? How does it resemble the flow of water in a pipe? Can you get a flashlight bulb to light, with a battery and a single wire? Electric Circuits and

More information

Current, Resistance and Electromotive Force. Young and Freedman Chapter 25

Current, Resistance and Electromotive Force. Young and Freedman Chapter 25 Current, Resistance and Electromotive Force Young and Freedman Chapter 25 Electric Current: Analogy, water flowing in a pipe H 2 0 gallons/minute Flow Rate is the NET amount of water passing through a

More information

The content contained in sections 1 4, 6 9, 11 13, and 15 of chapter 20 of the textbook is included on the AP Physics B exam.

The content contained in sections 1 4, 6 9, 11 13, and 15 of chapter 20 of the textbook is included on the AP Physics B exam. hapter 0 Electric ircuits hapter 0 ELETR RUTS PREVEW onventional current is the flow of positive charges though a closed circuit. The current through a resistance and the voltage which produces it are

More information

What is the direction of a compass needle placed at point A?

What is the direction of a compass needle placed at point A? SAMPLE QUIZ: COVERAGE OHM S LAW CIRCUIT ANALYSIS RESISTANCE ELECTRICAL POWER MAGNETISM AND ELECTROMAGNETISM MAGNETISM: 1. In order to produce a magnetic field, an electric charge must be 1. stationary

More information

The current that flows is determined by the potential difference across the conductor and the resistance of the conductor (Ohm s law): V = IR P = VI

The current that flows is determined by the potential difference across the conductor and the resistance of the conductor (Ohm s law): V = IR P = VI PHYS1000 DC electric circuits 1 Electric circuits Electric current Charge can move freely in a conductor if an electric field is present; the moving charge is an electric current (SI unit is the ampere

More information

PHYSICS 111 LABORATORY Experiment #3 Current, Voltage and Resistance in Series and Parallel Circuits

PHYSICS 111 LABORATORY Experiment #3 Current, Voltage and Resistance in Series and Parallel Circuits PHYSCS 111 LABORATORY Experiment #3 Current, Voltage and Resistance in Series and Parallel Circuits This experiment is designed to investigate the relationship between current and potential in simple series

More information

Electric Circuits Review

Electric Circuits Review Electric Circuits Review 1. Which of the following statements are true about electric current? Circle all that apply. a. Electric current is measured in units of Amperes. b. Electric current is defined

More information

Student Content Brief Advanced Level

Student Content Brief Advanced Level Student Content Brief Advanced Level Electric Circuits Background Information There are a variety of forces acting on the body of the Sea Perch. One important force is pushing electrons through the wires

More information

Fundamentals of Direct Current Circuits

Fundamentals of Direct Current Circuits Fundamentals of Direct Current Circuits Course No: E06-001 Credit: 6 PDH A. Bhatia Continuing Education and Development, Inc. 9 Greyridge Farm Court Stony Point, NY 10980 P: (877) 322-5800 F: (877) 322-4774

More information

Series & Parallel Circuits Challenge

Series & Parallel Circuits Challenge Name: Part One: Series & Parallel Circuits Challenge 1. Build a circuit using two batteries and two light bulbs in a way to illuminate the two light bulbs so that if either light bulb is disconnected,

More information

Ohm's Law and Circuits

Ohm's Law and Circuits 2. Conductance, Insulators and Resistance A. A conductor in electricity is a material that allows electrons to flow through it easily. Metals, in general, are good conductors. Why? The property of conductance

More information

Experiment #4: Basic Electrical Circuits

Experiment #4: Basic Electrical Circuits Purpose: Equipment: Discussion: Experiment #4: Basic Electrical Circuits Rev. 07042006 To construct some simple electrical circuits which illustrate the concepts of current, potential, and resistance,

More information

s_5xut Page 1 Physics Samples

s_5xut Page 1 Physics Samples Physics Samples E&M Unit 1. Two metal spheres having charges of +4.0 x 10 6 coulomb and +2.0 x 10 5 coulomb, respectively, are brought into contact and then separated. After separation, the charge on each

More information

More Concepts. I = dq. Current is the rate of flow of charge around a circuit.

More Concepts. I = dq. Current is the rate of flow of charge around a circuit. RC Circuits In this presentation, circuits with multiple batteries, resistors and capacitors will be reduced to an equivalent system with a single battery, a single resistor, and a single capacitor. Kirchoff's

More information

Physics Worksheet Electric Circuits Section: Name: Series Circuits

Physics Worksheet Electric Circuits Section: Name: Series Circuits Do Now: (1) What is electric circuit? (2) Convert the following picture into schematic diagram. Series Circuits 4. Label every component of the circuit; identify each of the voltage and current. 5. Relation

More information

Chapter 6. Experiment 4: Electric Currents and Circuits. 6.1 Introduction The Electric Current

Chapter 6. Experiment 4: Electric Currents and Circuits. 6.1 Introduction The Electric Current Chapter 6 Experiment 4: Electric Currents and Circuits 6.1 Introduction The resistance to the flow of an electric current is essential in the design of electronic devices and electric circuits generally.

More information

electrons/s

electrons/s CURRNT, RSISTANC, AND DIRCT-CURRNT CIRCUITS 9 Answers to Multiple-Choice Problems. B 2. B 3. D 4. B, D 5. A 6. A 7. C 8. A 9. C 0. C. C 2. C 3. C 4. A 5. Solutions to Problems 9.. Set Up: A 5 C/s. An electron

More information

ANSWERS to CIRCUITS V

ANSWERS to CIRCUITS V 1 ANSWERS to CIRCUITS 1. The speed with which electrons move through a copper wire is typically 10-4 m s -1. a. Explain why is it that the electrons cannot travel faster in the conductor? b. Explain why

More information

Chapter 24 Electric Currents and DC Circuits

Chapter 24 Electric Currents and DC Circuits What we call physics comprises that group of natural sciences which base their concepts on measurements; and whose concepts and propositions lend themselves to mathematical formulation. Its realm is accordingly

More information

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) If the voltage at a point in space is zero, then the electric field must be A) zero. B) positive.

More information

Electric Current and Current Density. Ohm s Law: resistance and resistors

Electric Current and Current Density. Ohm s Law: resistance and resistors CH25: Current, Resistance and Electromotive Force Electric Current and Current Density Drift Velocity Resistivity Ohm s Law: resistance and resistors Circuits Connection and emf Energy and Power in Circuits

More information

Resistance is defined as a measure of the ease of current flow, and is the ratio of the potential difference to the current - Ohm s law.

Resistance is defined as a measure of the ease of current flow, and is the ratio of the potential difference to the current - Ohm s law. Resistance and Ohms Law When we have a fixed potential difference then the electric field will also be fixed and therefore there will be a steady electric force on the charge carriers (electrons) - this

More information

Resistance and Ohm s Law - MBL

Resistance and Ohm s Law - MBL Resistance and Ohm s Law - MBL In this experiment you will investigate different aspects of Ohm s Law, which relates voltage, current, and resistance. A computer will be used to collect, display, and help

More information

3_given a graph of current_voltage for a resistor, determine the resistance. Three resistance R1 = 1.0 kω, R2 = 1.5 kω, R3 = 2.

3_given a graph of current_voltage for a resistor, determine the resistance. Three resistance R1 = 1.0 kω, R2 = 1.5 kω, R3 = 2. Ohm s Law Objectives: 1_measure the current_voltage curve for a resistor 2_construct a graph of the data from objective 1 3_given a graph of current_voltage for a resistor, determine the resistance Equipment:

More information

Introduction to Electricity & Magnetism. Dr Lisa Jardine-Wright Cavendish Laboratory

Introduction to Electricity & Magnetism. Dr Lisa Jardine-Wright Cavendish Laboratory Introduction to Electricity & Magnetism Dr Lisa Jardine-Wright Cavendish Laboratory Examples of uses of electricity Christmas lights Cars Electronic devices Human body Electricity? Electricity is the presence

More information

Physics 1653 Exam 3 - Review Questions

Physics 1653 Exam 3 - Review Questions Physics 1653 Exam 3 - Review Questions 3.0 Two uncharged conducting spheres, A and B, are suspended from insulating threads so that they touch each other. While a negatively charged rod is held near, but

More information

PHYS-2020: General Physics II Course Lecture Notes Section III

PHYS-2020: General Physics II Course Lecture Notes Section III PHYS-2020: General Physics Course Lecture Notes Section Dr. Donald G. Luttermoser East Tennessee State University Edition 4.0 Abstract These class notes are designed for use of the instructor and students

More information

Batteries, conductors and resistors

Batteries, conductors and resistors Batteries, conductors and resistors Lecture 3 1 How do we generate electric fields where does the energy come from? The e.m.f. generator uses some physical principle to create an excess of electrons at

More information

Exam 2. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.

Exam 2. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question. Class: Date: Exam 2 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. You wish to measure a current through a resistor. You should connect the measuring

More information

3.- What atom s particle moves through a conductor material? 4.- Which are the electric components of an elemental electric circuit?

3.- What atom s particle moves through a conductor material? 4.- Which are the electric components of an elemental electric circuit? 1.- What is electricity? 2.- Write down the name of the atom s particles. 3.- What atom s particle moves through a conductor material? 4.- Which are the electric components of an elemental electric circuit?

More information

Electricity and Water Analogy

Electricity and Water Analogy [ Assignment View ] [ Eðlisfræði 2, vor 2007 25. Current, Resistance, and Electromagnetic Force Assignment is due at 2:00am on Wednesday, February 14, 2007 Credit for problems submitted late will decrease

More information

Circuit symbol. Each of the cells has a potential difference of 1.5 volts. Figure 1. Use the correct answer from the box to complete the sentence.

Circuit symbol. Each of the cells has a potential difference of 1.5 volts. Figure 1. Use the correct answer from the box to complete the sentence. Q.(a) Draw one line from each circuit symbol to its correct name. Circuit symbol Name Diode Light-dependent resistor (LDR) Lamp Light-emitting diode (LED) (3) Figure shows three circuits. The resistors

More information

Σ I in = Σ I out E = IR 1 + IR 2 FXA 2008 KIRCHHOFF S LAWS 1. Candidates should be able to : LAW 1 (K1)

Σ I in = Σ I out E = IR 1 + IR 2 FXA 2008 KIRCHHOFF S LAWS 1. Candidates should be able to : LAW 1 (K1) UNT G482 Module 3 2.3.1 Series & Parallel Circuits Candidates should be able to : KRCHHOFF S LAWS 1 LAW 1 (K1) State Kirchhoff s second law and appreciate that it is a consequence of conservation of energy.

More information

Electric Circuits. 1 Electric Current and Electromotive Force

Electric Circuits. 1 Electric Current and Electromotive Force 1 Electric Current and Electromotive Force The flow of electric charges: Electric currents power light bulbs, TV sets, computers etc. Definition of electric current: The current is the rate at which charge

More information

Preview of Period 13: Electrical Resistance and Joule Heating

Preview of Period 13: Electrical Resistance and Joule Heating Preview of Period 13: Electrical Resistance and Joule Heating 13.1 Electrical Resistance of a Wire What does the resistance of a wire depend upon? 13.2 Resistance and Joule Heating What effect does resistance

More information

AP* Electric Circuits Free Response Questions

AP* Electric Circuits Free Response Questions AP* Electric Circuits Free Response Questions 1996 Q4 (15 points) A student is provided with a 12.0-V battery of negligible internal resistance and four resistors with the following resistances: 100 Ω,

More information

ch 18 practice Multiple Choice

ch 18 practice Multiple Choice ch 18 practice Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following is the best description of a schematic diagram? a. uses pictures

More information

Electro - Principles I

Electro - Principles I Electro - Principles I Atomic Theory Atomic Theory Page It is our intention here to handle atomic theory in a very light manner. Some knowledge is required in order to understand the characteristics of

More information

Experiment #5, Series and Parallel Circuits, Kirchhoff s Laws

Experiment #5, Series and Parallel Circuits, Kirchhoff s Laws Physics 182 Summer 2013 Experiment #5 1 Experiment #5, Series and Parallel Circuits, Kirchhoff s Laws 1 Purpose Our purpose is to explore and validate Kirchhoff s laws as a way to better understanding

More information

A. the current increases. B. the current decreases. C. the current stays the same. D. not enough information given to decide

A. the current increases. B. the current decreases. C. the current stays the same. D. not enough information given to decide Q25.1 Two copper wires of different diameter are joined in series in a circuit. A current flows in the wire combination. When the current flows from the larger-diameter wire into the smaller-diameter wire,

More information

Introduction to Electric Circuits. Dr. William A. Stapleton Ingram School Of Engineering Texas State University San Marcos

Introduction to Electric Circuits. Dr. William A. Stapleton Ingram School Of Engineering Texas State University San Marcos Introduction to Electric Circuits Dr. William A. Stapleton Ingram School Of Engineering Texas State University San Marcos Electrical Circuits (Over)simplified The simple model of matter is that it is made

More information

Chapter 6. Current and Resistance

Chapter 6. Current and Resistance 6 6 6-0 Chapter 6 Current and Resistance 6.1 Electric Current... 6-2 6.1.1 Current Density... 6-2 6.2 Ohm s Law... 6-5 6.3 Summary... 6-8 6.4 Solved Problems... 6-9 6.4.1 Resistivity of a Cable... 6-9

More information

Experiment #6, Series and Parallel Circuits, Kirchhoff s Laws

Experiment #6, Series and Parallel Circuits, Kirchhoff s Laws Physics 182 Spring 2013 Experiment #6 1 Experiment #6, Series and Parallel Circuits, Kirchhoff s Laws 1 Purpose Our purpose is to explore and validate Kirchhoff s laws as a way to better understanding

More information

Two kinds of electrical charges

Two kinds of electrical charges ELECTRICITY NOTES Two kinds of electrical charges Positive charge Negative charge Electrons are negatively charged Protons are positively charged The forces from positive charges are canceled by forces

More information

very small Ohm s Law and DC Circuits Purpose: Students will become familiar with DC potentiometers circuits and Ohm s Law. Introduction: P31220 Lab

very small Ohm s Law and DC Circuits Purpose: Students will become familiar with DC potentiometers circuits and Ohm s Law. Introduction: P31220 Lab Ohm s Law and DC Circuits Purpose: Students will become familiar with DC potentiometers circuits and Ohm s Law. Introduction: Ohm s Law for electrical resistance, V = IR, states the relationship between

More information

Series,"Parallel," and"series." Parallel"Circuits"

Series,Parallel, andseries. ParallelCircuits chapter 25 Series,"Parallel," and"series." Parallel"Circuits" FIGURE 25.1 A series circuit with three bulbs. All current flows through all resistances (bulbs). The total resistance of the circuit is the

More information

Part 1. Part 1. Electric Current. and Direct Current Circuits. Electric Current. Electric Current. Chapter 19. Electric Current

Part 1. Part 1. Electric Current. and Direct Current Circuits. Electric Current. Electric Current. Chapter 19. Electric Current Electric Current Electric Current and Direct Current Circuits Chapter 9 Resistance and Ohm s Law Power in Electric Circuits Direct Current Circuits Combination Circuits Real life is mostly dynamic Part

More information

Resistors in Series and Parallel

Resistors in Series and Parallel Resistors in Series and Parallel INTRODUCTION Direct current (DC) circuits are characterized by the quantities current, voltage and resistance. Current is the rate of flow of charge. The SI unit is the

More information

PS-6.2 Explain the factors that determine potential and kinetic energy and the transformation of one to the other.

PS-6.2 Explain the factors that determine potential and kinetic energy and the transformation of one to the other. PS-6.1 Explain how the law of conservation of energy applies to the transformation of various forms of energy (including mechanical energy, electrical energy, chemical energy, light energy, sound energy,

More information

Section 4. Ohm s Law: Putting up a Resistance. What Do You See? What Do You Think? Investigate. Learning Outcomes

Section 4. Ohm s Law: Putting up a Resistance. What Do You See? What Do You Think? Investigate. Learning Outcomes Section 4: Ohm s Law: Putting up a Resistance Section 4 Ohm s Law: Putting up a Resistance What Do You See? Learning Outcomes In this section, you will Calculate the resistance of an unknown resistor given

More information

AP1 Electricity. 1. A student wearing shoes stands on a tile floor. The students shoes do not fall into the tile floor due to

AP1 Electricity. 1. A student wearing shoes stands on a tile floor. The students shoes do not fall into the tile floor due to 1. A student wearing shoes stands on a tile floor. The students shoes do not fall into the tile floor due to (A) a force of repulsion between the shoes and the floor due to macroscopic gravitational forces.

More information

Physics Worksheet Electric Current Section: Name:

Physics Worksheet Electric Current Section: Name: Do Now: Water Flow vs. Electric Current Models: f an electric circuit consists of wires, a battery and a light bulb, please compare the water flow in the following picture to the electric current in a

More information