# 1) ASSOCIATE ELEMENTARY PARTICLES WITH THEIR ELECTRICAL CHARGE

Save this PDF as:

Size: px
Start display at page:

## Transcription

1 Name Date STUDY GUIDE CHAPTER 5 ELECTRICITY AND MAGNETISM 1) ASSOCIATE ELEMENTARY PARTICLES WITH THEIR ELECTRICAL CHARGE Scientists now know that an atom is composed of even smaller particles of matter: protons, neutrons and electrons. The following illustration represents the distribution of these elementary particles inside the atom: Figure 1: SUBATOMIC PARTICLES Electrical charge is a property of protons and electrons. It was proven that: - protons are positively charged (+); - electrons are negatively charged(-); - neutrons have neutral electrical charge(no charge or zero charge); SAMPLE QUESTIONS: 1) What do protons and neutrons have in common? A) They both carry an electrical charge. B) None of them carries an electrical charge. C) They are both situated outside the nucleus of an atom. D) They are both situated inside the nucleus of an atom. 2) Which of the following are positively charged? 1) The proton. 2) The electron. 3) The neutron. 4) The nucleus A) 1 and 2 B) 2 and 3 C) 3 and 4 D) 1 and 4 3) Which one of the following sentences is true? A) Positively charged objects have a deficit of protons. B) Positively charged objects have surplus of electrons. C) Negatively charged objects have a surplus of electrons. D) Negatively charged objects have a surplus of protons. Chapter 5 ELECTRICITY AND MAGNETISM Page 1

2 2) DESCRIBE THE BEHAVIOR OF ELECTRICAL CHARGES OF OPPOSITE SIGNS OR OF THE SAME SIGN WHEN CLOSE TOGETHER Brought close together, two electrically charged objects interact: - when the charges are similar, the objects repel each other positive repels positive negative repels negative - when the charges are opposite, the objects attract each other positive and negative attract SAMPLE QUESTIONS: 1) The following diagram shows four different objects and their electrical charge. The positive sign (+) represents the charge of the protons and negative sign (-) represents the charge of the electrons. Which of these objects are positively charged? A) 1 and 2 B) 2 and 3 C) 3 and 4 D) 1 and 4 Chapter 5 ELECTRICITY AND MAGNETISM Page 2

3 2) Silk and glass are two electrically neutral materials. Silk can be represented by and glass by. After these materials are rubbed together, silk becomes negatively charged and glass becomes positively charged. Which of the following models may represent silk and glass after these materials have been rubbed together? A) silk glass B) silk glass C) silk glass D) silk + glass ) Five metallic spheres were electrically charged and then suspended as shown in the diagram below: If sphere A lost electrons, which of the spheres were negatively charged? A) B and C B) C and D C) D and E D) E and B Chapter 5 ELECTRICITY AND MAGNETISM Page 3

4 4. The list below arranges different substances in increasing order of their tendency to acquire electrons. When two of these substances are rubbed together, the one situated lower on the list attracts electrons from the substance above and becomes negatively charged. Table 1 ELECTROSTATIC SERIES CHART In the laboratory, a student rubs a cotton cloth with each of the following substances: ebonite, plastic, acetate and glass. He then brings different samples together: 1) ebonite and plastic 2) plastic and acetate 3) acetate and glass 4) glass and ebonite In which of the situations did the objects repel each other? 4) 1 and 2 B) 1 and 3 C) 2 and 4 D) 2and 3 5) Tom wants to prepare a surprise party for his baby sister. Amongst other things, he wants to decorate the walls of their house with multi-coloured balloons. Once the balloons are inflated, Tom rubs them on his hair for a few seconds and then sticks them to the wall. He knows that this is possible due to friction, as the balloons become electrically charged and are attracted to the wall. Which of the following produced the static electricity? A) The transfer of protons between the hair and the balloons. B) The transfer of electrons between the hair and the balloons. C) The transfer of electrons between the balloons and the wall. D) The transfer of protons between the balloons and the wall. Chapter 5 ELECTRICITY AND MAGNETISM Page 4

5 3) DESCRIBE STATIC ELECTRICITY AS THE TRANSFER OF ELECTRONS FROM ONE BODY TO ANOTHER An electrically neutral body contains the same amount of protons (positive charges) and electrons (negative charges). Protons are very tightly bound to the nucleus and cannot be easily removed. Some electrons however, are not so tightly bound and can be transferred from one body to another. These transfers usually occur when two bodies are rubbed against each other. The atom that loses electrons becomes positively charged. The atom that gains electrons becomes negatively charged. Figure 1: ELECTRICALLY CHARGED OBJECTS Electrical charges can also be transferred from one body to another by direct contact. SAMPLE QUESTIONS: 1) Which one of the following sentences is true? A) The positive charge of an object comes from the transfer of protons. B) The human body conducts electricity. C) The lightning energy comes from the positive charges of protons. D) The unit of measurement for electrical energy is the watt. Chapter 5 ELECTRICITY AND MAGNETISM Page 5

6 2) Demonstrations using ebonite rods and wool cloth are very common in static electricity. After being rubbed with wool, an ebonite rod attracts small objects. Ebonite is known to hold its electrons very tightly when rubbed against other substances. Wool on the other hand, exerts very weak attraction on its electrons. The diagram below shows the distribution of electrical charges before the two objects (ebonite rod and wool) are rubbed together: A) Show the distribution of electrical charges in the two substances after the two objects are rubbed together (use + and -). Explain your diagram. THE WOOL CLOTH DOES NOT HOLD ITS ELECTRONS TIGHTLY, LIKE THE EBONITE ROD. BY RUBBING THESE SUBSTANCES TOGETHER SOME ELECTRONS ARE TRANSFERRED FROM THE WOOL CLOTH TO THE EBONITE ROD. BEFORE BEING RUBBED, BOTH OBJECTS CONTAIN EQUAL NUMBERS OF POSITIVE AND NEGATIVE CHARGES. AFTER RUBBING, THE EBONITE ROD HAS A SURPLUS OF ELECTRONS WHEREAS THE WOOL CLOTH HAS A DEFICIT OF ELECTRONS. NOTE: The number of negative charges that are added to the ebonite should equal the number negative charges that were removed from the wool cloth. The number of positive charges remains the same in both objects, because the positive charges cannot be transferred B) Explain why the ebonite rod attracts small objects after being rubbed with the wool cloth. SINCE THE EBONITE HAS ACQUIRED A NEGATIVE CHARGE, WHEN IT IS BROUGHT CLOSE TO OBJECTS LIKE SMALL PIECES OF PAPER, STYROFOAM ETC, THE POSITIVE CHARGES IN THESE OBJECTS WILL BE ATTRACTED BY THE GREATER NUMBER OF NEGATIVE CHARGES IN THE ONITE ROD AND WILL MOVE TOWARDS IT (BE ATTRACTED BY THE EBONITE ROD). Chapter 5 ELECTRICITY AND MAGNETISM Page 6

7 3) A student rubbed two identical inflated balloons on a piece of fur and suspended them from a high stand. He then rubbed a plastic ruler with a piece of wool and placed it between the two suspended balloons. The balloons quickly went high in the air as shown in the figure below. Knowing that the wool cloth transferred electrical charges to the ruler, determine the overall charge of the wool cloth, balloons, fur and ruler, when the balloons are in the air. Explain your answer. ruler Electrical Charge (positive/negative) negative Explanation Because only electrons can be transferred from one object to another, the ruler acquired a surplus of electrons by being rubbed with the wool cloth. wool cloth positive The wool cloth has transferred electrons to the ruler, so it has lost electrons and became positively charged. balloons negative Since the ruler is negatively charged and repels the two balloons, the balloons must be negatively charged also. They acquired a surplus of electrons by being rubbed with the fur. fur positive By transferring electrons to the balloons, the fur acquired a deficit of electrons and became positively charged. Chapter 5 ELECTRICITY AND MAGNETISM Page 7

8 4) DESCRIBE THE FUNCTION OF DIFFERENT ELEMENTS OF AN ELECTRICAL CIRCUIT Electrical circuits transform electrical energy into other forms of usable energy (light, heat, sound, mechanical energy etc). The table below presents some components of electrical circuits and their specific role. Table 2 BASIC ELECTRICAL CIRCUIT COMPONENTS AND THEIR FUNCTIONS COMPONENT ELECTRICAL FUNCTION DESCRIPTION power source, power supply creates a potential difference; transfers energy to battery electrons wires conduction connect the elements and the power supply; carry electrons from the source to the elements and back to the source resistors(elements) transformation transform electrical energy into other forms of energy (light, heat, sound etc); limit the flow of electrons switch control allows the current control by connecting or breaking the circuit; (when a switch is off, the electron flow is interrupted) ammeter measures the current flowing through a circuit (connected in series) voltmeter measures the potential difference (energy) that electrons have between two points of the circuit (connected in parallel) SAMPLE QUESTIONS: 1) Which of the components depicted by the symbols below is used to STOP the electron flow in an electrical circuit? A) B) C) D) 2) Which of the circuit components below is designed to hinder the flow of electrons through an electrical circuit? A) a copper wire B) an alkaline battery C) a light bulb D) an electrical switch Chapter 5 ELECTRICITY AND MAGNETISM Page 8

9 3) In which of the following electrical circuits below the electron flow IS NOT possible? A) 1 and 2 B) 1 and 3 C) 2 and 3 D) 2 and 4 4) Draw arrows to match the components below with the right function they carry in electrical circuits: Chapter 5 ELECTRICITY AND MAGNETISM Page 9

10 5) DESCRIBE THE TWO TYPES OF CONNECTIONS IN ELECTRICAL CIRCUITS (SERIES, PARALLEL). REPRESENT A SIMPLE ELECTRICAL CIRCUIT USING A DIAGRAM An electrical current is a flow of electrical charges. An electrical circuit is a network in which electrical charges flow continuously. In order for charges to flow, all parts of the circuit must be connected together. SERIES CIRCUITS In a series circuit, elements are linked directly together (connected end to end). All charges follow the same pathway. If a part of the circuit is open or an element is defective, the current ceases to flow through the entire circuit. PARALLEL CIRCUITS A parallel circuit branches out in at least one point (node). The charges follow different pathways. If a part of the circuit is open or an element is defective, the current continues to flow through the other branches. Diagram 1: SERIES CIRCUIT Diagram 2: PARALLEL CIRCUIT The conventional current, I, represents the flow of positive charges (from the positive to the negative terminal). MEASURING INSTRUMENTS Ammeters are connected IN SERIES (the current passes through the ammeter). Voltmeters are connected IN PARALLEL (outside the element whose voltage is measured). Diagram 3: MEASURING INSTRUMENTS Chapter 5 ELECTRICITY AND MAGNETISM Page 10

11 SAMPLE QUESTIONS: 1) Which of the circuits below are connected in parallel? A) 1 and 4 B) 2 and 4 C) 1 and 3 D) 2 and 3 4 2) Four electrical circuit diagrams are given below. Which of these diagrams shows the voltmeter correctly positioned to measure the potential difference across the terminals of resistor R1? A) C) R1 V R2 V R1 R2 B) D) R1 R1 R2 V V R2 Chapter 5 ELECTRICITY AND MAGNETISM Page 11

12 3) A circuit consists of a power supply and two light bulbs (L1 and L2). Which of the following diagrams shows the correct connection for an ammeter that measures the current flowing through light bulb L2? A) A C) L 1 L 1 L 2 A L 2 B) A D) L 1 L 1 L 2 L 2 A 4) In which of the circuits on the right is the voltmeter correctly connected? A) 1 and 2 B) 2 and 3 C) 3 and 4 D) 1 and 4 Chapter 5 ELECTRICITY AND MAGNETISM Page 12

13 5) Which of the diagrams below represents a circuit in which the following 2 situations are possible? ANSWER:B When Switch S1 is on and Switch S2 is off, only light L1 will be on. When Switch S1 is off and Switch S2 is on, neither light will be on 6) An electric circuit consists of a power source, two switches (S1 and S2) and two light bulbs (L1 and L2). The following table shows what happens to both light bulbs: Which of the following circuit diagrams illustrates the results shown in the table above? ANSWER:A Chapter 5 ELECTRICITY AND MAGNETISM Page 13

14 7) The figure below represents a simple electrical circuit containing a power source, two light bulbs and one resistor: Which of the following diagrams could represent this circuit? ANSWER:B Chapter 5 ELECTRICITY AND MAGNETISM Page 14

15 6) DISTINGUISH BETWEEN ALTERNATING AND DIRECT CURRENT There are two types of electric current: DIRECT CURRENT (DC) - electrons continuously move in the same direction (ex. the current produced by a battery). Figure 1 MOTION OF ELECTRONS IN DIRECT CURRENT ALTERNATING CURRENT (AC) - electrons change direction many times every second (they flow back and forth); it is produced by power plants. In North America, the current has a frequency of 60Hz which means that it changes direction 60 times every second. Figure 2 MOTION OF ELECTRONS IN ALTERNATING CURRENT Power plants produce alternating current. This is more advantageous as during the electrical current distribution of alternating current, less energy is lost. Since most electrical appliances and electronic devices function on direct current, they usually use a regulator that transforms alternating current into direct current. SAMPLE QUESTIONS: 1) Which of the following statements describe an alternating current (AC)? 1. It is produced by a battery 2. Electrons change direction continuously. 3. It is produced by a power plant. 4. Electrons move in the same direction. A) 1 and 2 B) 2 and 3 C) 2 and 4 D) 3 and 4 Chapter 5 ELECTRICITY AND MAGNETISM Page 15

16 7) DESCRIBE THE RELATIONSHIP BETWEEN VOLTAGE, RESISTANCE AND CURRENT INTENSITY IN AN ELECTRICAL CIRCUIT; APPLY THE MATHEMATICAL RELATIONSHIP BETWEEN VOLTAGE, RESISTANCE AND CURRENT INTENSITY IN AN ELECTRICAL CIRCUIT Ohm s law describes the relationship between several important physical quantities used in electricity. The current intensity (I) represents the amount of charges that flow through a point of an electrical circuit in one second. The potential difference (V) is the amount of energy transferred by electrons between two points of an electrical circuit. The resistance (R) of an element or a circuit is a property of materials. It represents the ability of a material to oppose (resist) the flow of electric charges. Ohm s Law states that: FOR A GIVEN RESISTANCE, THE POTENTIAL DIFFERENCE IN AN ELECTRICAL CIRCUIT IS DIRECTLY PROPORTIONAL TO THE CURRENT INTENSITY. The mathematical expression of Ohm s Law shows the direct proportionality between the potential difference and current intensity, for a given resistance: V=R I The above formula can be also written as: and Where: V is the potential difference (voltage) expressed in volt (V) I is the current intensity (current) expressed in amperes (A) R is the resistance expressed in ohm (Ω) SAMPLE QUESTIONS: 1) In an electrical circuit, the number of electrons crossing through the section of a wire in one second has doubled. The total resistance of the circuit stayed the same. How did potential difference change? A) The potential difference halved. B) The potential difference doubled. C) The potential difference quadrupled. D) The potential difference stayed the same. Chapter 5 ELECTRICITY AND MAGNETISM Page 16

17 2) In the circuit diagram below the voltmeter measures 12 V and the ammeter measures 0.6 A. What is the resistance of element R?. =20 Ω A) 7.2 Ω B) 0.05 Ω C) 20 Ω D) 7.2 J 3) What is the potential difference of a current of 10 A flowing through a resistance of 25 Ω? V=R I=25 Ω x 10 A = 250 V A) 0.4 V B) 250 Ω C) 2.5 V D) 250 V 4) You have a large flashlight that takes a 1.5 V battery. If the resistance of the light bulb is 3 Ω, what is the current in the light bulb?.. Ω A) 500 A B) 500 ma C) 2 A D) 4.5 A 5) An electrical appliance has a defective resistor with a resistance of 10 Ω. You are asked to replace this resistor. The following table provides information about four resistors you have been given. Resistor Potential difference (V) Current (A) Which one of the above resistors could replace the defective one? A) Resistor 1 B) Resistor 2 C) Resistor 3 D) Resistor 4. =10 Ω Chapter 5 ELECTRICITY AND MAGNETISM Page 17

18 6) A circuit contains a 1.5 volt battery and a bulb with a resistance of 3 ohms. Calculate the current., =0.5A 7) An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance. =240 Ω. 8) What is the voltage of a circuit with 15 amps of current and toaster with 8 ohms of resistance? V = R I = 8 Ω x 15A = 90 V 8) APPLY THE MATHEMATICAL RELATIONSHIP BETWEEN POWER, VOLTAGE AND CURRENT INTENSITY IN AN ELECTRICAL CIRCUIT (P = VI) Electrical power is physical quantity expressing the amount of work an electrical device can perform in one second. The electrical power of a circuit is directly proportional to both voltage and current intensity and can be expressed in a formula as: Where: P is the electrical power expressed in W (watt) V is the voltage expressed in V (volt) I is the current intensity expressed in A (amperes) SAMPLE QUESTIONS: 1) A student was asked to assemble a simple electrical circuit made of a resistor and a battery and calculate its electrical power. Since he was asked to perform further calculations, he also connected also a voltmeter and an ammeter to his circuit. The diagram below represents the circuit that he assembled: The current intensity in the circuit is 0.8 A and the voltage on the resistor is 20 V. What is the electrical power of this circuit?. A) 0.04 W B) 16 kw C) 16 W D) 25 Kw Chapter 5 ELECTRICITY AND MAGNETISM Page 18

19 2) What is the current drawn when a kettle of power 1.65 kw is connected to an 110V power supply? =15A A) A B) A C) 15 A D) A 3) What is the voltage required by an electric grill of power 2.2 kw and current 20 A? =110V A) 110 V B) 0.11 V C) 26.4 V D) 9.1 V 9) DESCRIBE QUALITATIVELY THE RELATIONSHIP BETWEEN THE POWER OF AN ELECTRICAL APPLIANCE, THE ELECTRICAL ENERGY IT CONSUMES AND THE AMOUNT OF TIME IT IS IN OPERATION. APPLY THE MATHEMATICAL RELATIONSHIP BETWEEN ELECTRICAL ENERGY CONSUMED, THE POWER OF AN ELECTRICAL APPLIANCE AND THE AMOUNT OF TIME IT IS IN OPERATION (E = P T) The electrical energy of an electrical circuit can be calculated using the formula: E t Where: E is the electrical energy expressed in J (joule) or kwh (kilowatt hour) P is the electrical power expressed in W (watt) or kw (kilowatt) t is the time interval expressed in seconds (s) or hours (h) The electrical energy consumed by an electrical appliance is directly proportional to the power of the appliance and the amount of time it is in operation. In other words, the more powerful an electrical appliance is, the more energy it consumes. The longer an appliance is in operation, the more energy it consumes. SAMPLE QUESTIONS: 1) Which of the following would reduce the cost of using an electrical appliance? 1. Increase the operation time. 2. Use an appliance with a lower power rating. 3. Use a cheap appliance. 4. Reduce the operation time. 5. Use an appliance with a higher power rating. 6. Use a new appliance. A) 1 and 3 B) 2 and 4 C) 3 and 5 D) 4 and 6 Chapter 5 ELECTRICITY AND MAGNETISM Page 19

20 2) How much energy does an electric heater of power 200 W give off in 2 minutes (120s)? E = =24000 J=24kJ A) 400 J B) 24 kj C) 100 J D) 0.01 kj 3) What is the energy consumed by an oven with an electrical power of 4 kw which is in use for 2.5 hours? E =. =10kW h A) 0.9 kwh B) 10kJ C) 10 kwh D) kj 4) What is the time taken for a fire of power 2 kw (2000 W) to use J of energy? =15s A) 15 s B) s C) 60 min D) 0.07 h 5) What is the power of an electric bulb that gives off 3600 J of energy in 10 minutes (600s)? =6W A) 6 W B) 360 W C) 2.8 kw D) 6 kw 6) This morning, Julie did the following: She turned on a 40-W lamp and left it for 1 hour and 18 minutes. For 54 minutes, she listened to a radio with a power of 5 W. She took a shower. She did her laundry in warm water. The following table indicates the amount of electrical energy consumed during certain activities. ENERGY CONSUMED FOR DIFFERENT ACTIVITIES Activity Energy consumed (W h) bath 3600 Shower 2400 Warm water laundry 2590 Cold water laundry 240 Using this information, determine the total amount of electrical energy Julie used this morning. Show all your work. Chapter 5 ELECTRICITY AND MAGNETISM Page 20

21 Answer: 1) Calculate the energy consumed by the lamp: Usage time = 1 h + 18 min = 1 hour hours = 1.3 hours Energy: 40W x 1.3 hours = 52 W h 1) Calculate the energy consumed by the radio: Usage time = 54min = 0.9 hours Energy= 5W x 0.9 hours = 4.5 W h 2) Calculate all energy consumed: Activity Using the lamp Listening to the radio Shower Warm water laundry Total Energy consumed 52 W h 4.5 W h 2400 W h 2590 W h W h Answer: The total amount of energy Julie used this morning is W h Chapter 5 ELECTRICITY AND MAGNETISM Page 21

22 10) DESCRIBE THE FORCES OF ATTRACTION AND REPULSION BETWEEN MAGNETS AND FERROMAFNETIC SUBSTANCES All magnets have a magnetic field. The magnetic field is the space around a magnet where magnetic forces are felt (both attraction and repulsion). The Lines of force show you the shape, direction, and strength of the magnetic field around a magnet. The shape is shown by lines of force which can be straight, curved, circular, etc. The direction is shown by arrowheads; the direction is always from North to South. The strength is shown by how close the lines are to each other. The closer the lines of force are, the stronger the magnetic field. SAMPLE QUESTIONS: 1) Draw the magnetic field between the following poles: 2) Determine whether there is an attractive or repulsive force between the following pairs of magnets. Chapter 5 ELECTRICITY AND MAGNETISM Page 22

23 3) Indicate the polarity (N or S) in the space indicated for the following pairs of magnets: 4) Draw the magnetic field around the following bar magnet: 5) Two magnets are placed end to end. Which diagram correctly illustrates the magnetic fields around these magnets? ANSWER: B 6) Does a magnetic field have a direction? YES: NORTH TO SOUTH Chapter 5 ELECTRICITY AND MAGNETISM Page 23

24 7) A straight magnet always produces an external magnetic field. In which of the following diagrams is this magnetic field correctly represented? ANSWER: A 8) Indicate the North (N) and South (S) poles in the following magnet. Chapter 5 ELECTRICITY AND MAGNETISM Page 24

### 3. As shown in the diagram below, a charged rod is held near, but not touching, a neutral electroscope.

1. As a positively charged rod is brought near to but not allowed to touch the knob of an uncharged electroscope, the leaves will diverge because negative charges are transferred from the electroscope

### Circuits Review KEY Interpreting Diagrams Use the diagram below to answer the following questions.

Circuits Review KEY Interpreting Diagrams Use the diagram below to answer the following questions. 1. Look at the arrows which indicate the direction of the flow of electrons. Label the negative and the

### 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

### 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

### 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

### 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

### Chapter 17 Study Questions Name: Class:

Chapter 17 Study Questions Name: Class: Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. If two charges repel each other, the two charges

### 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

### STUDY GUIDE: ELECTRICITY AND MAGNETISM

319 S. Naperville Road Wheaton, IL 60187 www.questionsgalore.net Phone: (630) 580-5735 E-Mail: info@questionsgalore.net Fax: (630) 580-5765 STUDY GUIDE: ELECTRICITY AND MAGNETISM An atom is made of three

### 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

### 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,

### Basic Electricity Notes

Basic Electricity Notes EVERYTHING IS MADE OF ATOMS Imagine a pure gold ring. Divide it in half and give one of the halves away. Keep dividing and dividing and dividing. Soon you will have a piece so small

### Electrical Power. How do you calculate electrical power? 14.3

. Name: Date: Electrical Power 14.3 How do you calculate electrical power? In this skill sheet you will review the relationship between electrical power and Ohm s law. As you work through the problems,

### 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

### 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

### CHAPTER 17 NOTES FOR EIGHTH GRADE PHYSICAL SCIENCE ALL MATTER IS COMPOSED OF VERY SMALL PARTICLES CALLED ATOMS.

CHAPTER 17 NOTES FOR EIGHTH GRADE PHYSICAL SCIENCE ALL MATTER IS COMPOSED OF VERY SMALL PARTICLES CALLED ATOMS. THE LAW OF ELECTRIC CHARGES STAES THAT LIKE CHARGES REPEL AND OPPOSITE CHARGES ATTRACT. BECAUSE

### 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,

### 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

### 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

### Electrical discharge in air e.g. lightning

Static Electricity electron transfer causes static electricity results from an imbalance of charges can occur by induction, friction, and contact You need to describe the direction of motion of charges

### 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

### 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

### 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

### Coulomb's Law. Two like charges of 1 Coulomb placed 1 meter apart repel each other with a force of 9 x 10 9 Newtons

Electricity Electricity is a force much like gravity but many times more powerful. Unlike gravity, electrical forces can be attractive or repulsive. Gravity has only one type of mass. Electricity has two

### 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

### Electricity. Introduction. Key concepts of electricity. Static electricity. Current electricity

Electricity Introduction This topic explores the key concepts of electricity as they relate to: static electricity current electricity higher order models of electric circuits household electricity electricity

### Material World: Electricity

17. Coulomb s Law The force, F, between two objects with charge q 1 and q 2, is given by: k q 1 q F - 2, where r = distance between the two charges in meters 2 r k = Coulomb's constant = 9 X 10 9 m 2 /C

### National 5 Physics. Language Wikipedia. Electricity

National 5 Physics Catlin.Fatu@English Language Wikipedia Electricity Throughout the Course, appropriate attention should be given to units, prefixes and scientific notation. tera T 10 12 x 1,000,000,000,000

### 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

### Concepts and principles of electricity

Unit 5 Uses Concepts and Principles of Electricity Physics Chapter 5 Concepts and principles of electricity Competency Uses concepts and principles of electricity in daily life Competency level 5' 1' Produces

### 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

### Vocabulary Electrical Energy Negative charge Electric Field Conductor Insulator Voltage Current Circuit breaker Fuse. Chapter 17.

Introduction to Electricity Table of Contents Bellringer Write a definition for electric charge in your own words in your science journal. When do you experience electric charges most, in winter or in

### 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

### Section 6. Current, Voltage, and Resistance in Parallel and Series Circuits: Who s in Control? What Do You See? What Do You Think?

Section 6 Current, Voltage, and Resistance in Parallel and Series Circuits: Who s in Control? What Do You See? Learning Outcomes In this section, you will ssemble a switch in a circuit with parallel components

### Henry Lin, Department of Electrical and Computer Engineering, California State University, Bakersfield Lecture 3 (Electric Circuits) July 16 th, 2013

Henry Lin, Department of Electrical and Computer Engineering, California State University, Bakersfield Lecture 3 (Electric Circuits) July 16 th, 2013 1 What is an electrical circuit? An electrical network

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

### 1. What is the potential difference across a 5 ohm resistor which carries a current of 5 A? a. 100 V b. 25 V c. 4 V d. 1 V

3s 1. What is the potential difference across a 5 ohm resistor which carries a current of 5 A? a. 100 V b. 25 V c. 4 V d. 1 V 2. A superconducting wire's chief characteristic is which of the following?

### 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

### Lesson Plan for Introduction to Electricity

Lesson Plan for Introduction to Electricity Last Updated: 01/16/2009 Updated by: Science For Kids Electricity Lesson 1 Table of Contents Lesson Summary... 3 Lesson Information... 4 Activity Descriptions

### 101 BASICS SERIES LEARNING MODULE 2: FUNDAMENTALS OF ELECTRICITY. Cutler-Hammer

101 BASICS SERIES LEARNING MODULE 2: FUNDAMENTALS OF ELECTRICITY Cutler-Hammer WELCOME Welcome to Module 2, Fundamentals of Electricity. This module will cover the fundamentals of electricity in a practical

### 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:

### ELECTRICAL FUNDAMENTALS

General Electricity is a form of energy called electrical energy. It is sometimes called an "unseen" force because the energy itself cannot be seen, heard, touched, or smelled. However, the effects of

### 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

### Magnets and the Magnetic Force

Magnets and the Magnetic Force We are generally more familiar with magnetic forces than with electrostatic forces. Like the gravitational force and the electrostatic force, this force acts even when the

### 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

### Coulomb s Law. F = k q 1q 2. k = x 10 9 N m 2 /C 2

Electricity Electricityisaforcemuchlikegravitybutmillionsoftimemorepowerful. Unlike gravity, electricity can be attractive and repulsive. There are two types of electric charge which are labeled positive

### Conceptual Questions Two charged objects are separated by a distance d. The first charge is larger in magnitude than the second charge.

Conceptual Questions 16 1. Two charged objects are separated by a distance d. The first charge is larger in magnitude than the second charge. A) The first charge exerts a larger force on the second charge.

### Chapter 02. Voltage and Current

Chapter 02 Voltage and Current Source: Circuit Analysis: Theory and Practice Delmar Cengage Learning C-C Tsai Atom Atomic Theory Review Contains a nucleus of protons and neutrons Nucleus is surrounded

### Exampro GCSE Physics. P2 Foundation - Static and Electrical Circuits Self Study Questions. Name: Class: Author: Date: Time: 129. Marks: 129.

Exampro GCSE Physics P2 Foundation - Static and Electrical Circuits Self Study Questions Name: Class: Author: Date: Time: 29 Marks: 29 Comments: Page of 45 Q. The diagram shows a circuit. (a) (i) Name

### Clayton College & State University Department of Natural Sciences September 2, Physics 1112 Quiz 1. Name SOLUTION

Clayton College & State University September 2, 2004 Name SOLUTION 1. Three non-conducting balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball

### Shining a Light. Design & Technology. Year 9. Structure of an electric torch. Shining a Light

Looking at electronic circuits and what is meant by current, voltage, and resistance. Shining a Light Have you ever taken an electric torch to pieces to find out how it works? Look at the diagram below

### Section 5. Electric Power: Load Limit. What Do You See? What Do You Think? Investigate. Learning Outcomes

Section 5 Electric Power: Load Limit What Do You See? Learning Outcomes In this section, you will Define power, insulator, and conductor. Use the equation for power, P = IV. Calculate the power limit of

### 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.

### 1. The diagram below represents magnetic lines of force within a region of space.

1. The diagram below represents magnetic lines of force within a region of space. 4. In which diagram below is the magnetic flux density at point P greatest? (1) (3) (2) (4) The magnetic field is strongest

### Energy, electricity and magnetism page The diagram below shows an object made from a battery, a nail, and some wire.

Energy, electricity and magnetism page 3 Name: ate: 1. The diagram below shows an object made from a battery, a nail, and some wire. What will happen if you touch a metal paperclip to the nail? A. The

### Reading Comprehension Skills Preview the Book Compare and Contrast How to Read Charts Main Idea and Details

TM Red Edition Grade 3 4 reading level Purple Edition Grade 4 5 reading level Objectives Understand that electric charge is a property of matter. Compare static electricity and current electricity. Describe

### Chapter 3: Electricity

Chapter 3: Electricity Goals of Period 3 Section 3.1: To define electric charge, voltage, and energy Section 3.2: To define electricity as the flow of charge Section 3.3: To explain the generation electricity

### 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

### 4 Electrical Quantities and Ohm s Law

Ch a pt er 4 Electrical Quantities and Ohm s Law Learning Outcomes Define electric current, voltage, resistance, power, and energy, and list the unit of measurement of each. Identify the essential parts

### 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

### 10.2. The Transfer of Static Electric Charges. Charged Objects

10.2 The Transfer of Static Electric Charges Here is a summary of what you will learn in this section: Electroscopes are instruments that detect static charge. In charging by contact, an orginally neutral

### Quiz: What is the voltage difference across the 25- resistance?

Quiz: What is the voltage difference across the 25- resistance? a) 0.1 V b) 2.5 V c) 6 V d) 25 V e) 60 V since I 25 I series : V 25 I series R 25 0.1 A 25 2.5 V In a parallel circuit, there are points

### 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

### Investigating Electrical Energy Workshop. QUT Extreme Engineering

Investigating Electrical Energy Workshop QUT Extreme Engineering Investigating Electrical Energy Introduction This workshop is designed for grades 6-7, to give them some hands-on experience in building

### TOPIC 4 ELECTRIC CIRCUITS

IGCSE Physics 0625 notes Topic 4: Electric Circuits 1 TOPIC 4 ELECTRIC CIRCUITS ELECTRIC CURRENT (I): Current (I) is defined as the rate of flow of electric charge (Q) in an electric conductor. The unit

### Chapter 11. Circuits

Chapter 11 Circuits 376 377 AP Physics Multiple Choice Practice Circuits 1. Multiple Correct. Which two arrangements of resistors shown above have the same resistance between the terminals? Select two

### National 4 Summary Notes

North Berwick High School Department of Physics National 4 Summary Notes Unit 3 Electricity and Energy Physics N4 Unit 1: Pupil Notes Page 1 of 22 Section 1: Generation of Electricity What is electricity?

### Let s Explore Electricity Basics!

Let s Explore Electricity Basics! Instructor Guide Subject Area Unit Grade Time Science Physical Science 5th grade 45 minutes Overview This lesson provides instruction on static electricity and the two

### 2. In Newton s universal law of gravitation the masses are assumed to be. B. masses of planets. D. spherical masses.

Practice Test: 41 marks (55 minutes) Additional Problem: 19 marks (7 minutes) 1. A spherical planet of uniform density has three times the mass of the Earth and twice the average radius. The magnitude

### 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.

### 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

### 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.

### Student Exploration: Circuits

Name: Date: Student Exploration: Circuits Vocabulary: ammeter, circuit, current, ohmmeter, Ohm s law, parallel circuit, resistance, resistor, series circuit, voltage Prior Knowledge Questions (Do these

### Currents in electrical circuits

Currents in electrical circuits P2 73 minutes 73 marks Page of 3 Q. (a) The diagram shows the inside of a three-pin plug. (i) What name is given to the wire labelled S? Draw a ring around the correct answer.

### Electricity. Electrostatics. Charge vs Charged. + / - terminology

Electricity Electrostatics Charge vs Charged + / - terminology 1 Charge Facts 1.) Charge 2.) 1 C of charge. 3.) You can convert # of electrons into charge and vice versa 4.) Opposites Attract Like charges

### Note-A-Rific: Characteristics

Note-A-Rific: Characteristics Any path along which electrons can flow is a circuit. For a continuous flow of electrons, there must be a complete circuit with no gaps. A gap is usually an electric switch

### 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

### Direction of current flow. Heat produced in a resistor. Heat produced in a resistor. L 27 Electricity and Magnetism [4]

L 27 Electricity and Magnetism [4] simple electrical circuits direct current DC Alternating current (AC) vs direct current (DC) electric power distribution household electricity household wiring GFIC s

### 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,

### 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

### Experiment 5-Electric Charges Lab

Experiment 5-Electric Charges Lab So what are atoms made of? In the middle of each atom is a "nucleus." The nucleus contains two kinds of tiny particles, called protons and neutrons. Orbiting around the

### 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

### 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.

### Pure water is non-conducting. Gas discharges. Current flow of electric charge. L 26 Electricity and Magnetism [3] A salt water solution is a conductor

L 26 Electricity and Magnetism [3] Electric circuits what conducts electricity what doesn t conduct electricity Current voltage and resistance Ohm s Law Heat in a resistor power loss Making simple circuit

### Circuits and Electricity

Have you ever thought about how much we depend on electricity? Electricity is a form of energy that runs computers, appliances, and radios. Electricity lights our homes, schools, and office buildings.

### 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

### Slide 1 / 33. Electric Charge and Electric Field

Slide 1 / 33 Electric Charge and Electric Field Slide 2 / 33 Electric Charge When you rub a rod with a piece of fur both objects become charged and you can pick up small pieces of paper. This natural phenomenon

### Preview of Period 12: Electric Circuits

Preview of Period 2: Electric Circuits 2. Voltage, Current, and esistance How are voltage, current, and resistance related? 2.2 esistance and Voltage of esistors in Connected in Series How does current

### Electric Potential Difference

Name: Electric Potential Difference Read from Lesson 1 of the Current Electricity chapter at The Physics Classroom: http://www.physicsclassroom.com/class/circuits/u9l1a.html http://www.physicsclassroom.com/class/circuits/u9l1b.html

### 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,

### 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

### f. The current at location A is equal to the current at location B. e. The current at location B is greater than the current at location E.

1. Answer: The current outside the branches of a combination circuit is everywhere the same. The current inside of the branches is always less than that outside of the branches. When comparing the current

### SNC1L Unit 3 Electrical Circuits

SNC1L Unit 3 Electrical Circuits SNC1L Science Unit 3 - Introduction Introduction Electricity is an energy source that we encounter every day. We are very familiar with what electrical energy can do, but

### Electrical Fundamentals Module 3: Parallel Circuits

Electrical Fundamentals Module 3: Parallel Circuits PREPARED BY IAT Curriculum Unit August 2008 Institute of Applied Technology, 2008 ATE310- Electrical Fundamentals 2 Module 3 Parallel Circuits Module

### 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

### Magnetic Forces and Magnetic Fields

1 Magnets Magnets are metallic objects, mostly made out of iron, which attract other iron containing objects (nails) etc. Magnets orient themselves in roughly a north - south direction if they are allowed

### ELECTRICITY. Electricity

ELECTRICITY Electricity Subject area : Physics Safety net : Atoms, Static electricity,attract/repel forces,nucleus, protons,electrons, neutrons, phenomenon, charge Electric force and Coulomb s law. Learning

### SERIES AND PARALLEL CIRCUITS

SERIES AND PARALLEL CIRCUITS Circuits Provides a path for electricity to travel Similar to water pipes in your house Because of the voltage of an outlet, electrons will travel through the circuit Electrons