Electricity Review-Sheet

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1 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 charged strip is brought near, but does not touch, the electroscope?.. 6. In the diagram, a cloth is brought near, but does not touch a neutral electroscope. The electroscope leaves separate. What charge, if any, does the cloth have?. a positive charge. a negative charge. an unknown charge. no charge 7. In the diagram here a negatively charged rod approaches a neutral pith ball. In which direction will the pith ball move? particle of aluminum is found to have 13 protons in its nucleus with 10 electrons in orbit around the nucleus. This particle would be 3. In the resistor shown, 24 joules of work is done in moving 6.0 coulombs of charge from point to point. What is the electrical potential between and?. negatively charged. positively charged. electrically neutral. heavier than a normal aluminum atom. 12 volts. 48 volts. 3.0 volts. 4.0 volts 4. Electrical power is measured in units called. watts. joules. volts. amperes 9. n electrical potential of one joule per coulomb is equal to. one coulomb. one ampere. one ohm. one volt 5. negatively charged rod is brought in contact with an electroscope. s the rod gives up electrons, the number of protons in the rod will 10. unit of electrical energy is the. ampere. volt. watt. joule. decrease. increase. remain the same page 1

2 11. What is the charge of an object repelled by a negatively charged rubber rod? 15. If an uncharged electroscope is touched with a neutral object, the separation of the leaves of the electroscope will. It must be positively charged.. It must be negatively charged.. decrease. increase. remain the same. It may be neutral.. It may be either positively charged or neutral. 16. body will maintain a constant negative electrostatic charge if the body 12. Objects and are charged as shown in the diagram. and are brought together and touched. Which is the correct distributions of charge after the two objects have been separated?... maintains the same excess of electrons. maintains the same excess of protons. continuously receives more electrons than it loses. continuously receives more protons than it loses Two neutral materials are rubbed together and there is a transfer of electrical charge from one material to the other. The net electrical charge for the system. increases as electrons are transferred. increases as protons are transferred. remains constant as electrons are transferred. remains constant as protons are transferred 13. Two objects, and, are rubbed together. If object acquires an excess of 100 electrons, object must have. gained 100 electrons. gained 100 protons 18. The diagram represents two charged parallel plates. How does the intensity of the electric field compare at locations,, and?. lost 100 electrons. lost 100 protons 14. Which of the diagrams given shows the correct distribution of charge on the knob and leaves of an electroscope after it has made contact with a negatively charged hard rubber rod?... The intensity is greater at than at.. The intensity is greater at than at.... The intensity is greater at than at.. The intensity is the same at,, and. page 2

3 19. s shown in the diagram, a charged rod is held near, but not touching, a neutral electroscope. The charge on the knob is 22. Electrostatic force F exists between two point charges with a separation distance d. Which graph best represents the relationship between F and d?... positive and the leaves are positive... positive and the leaves are negative. negative and the leaves are positive. negative and the leaves are negative 20. The diagram represents oppositely charged plates in an evacuated glass tube. Which diagram below represents the path of free electrons between the charged plates? 23. negatively charged object is brought near the knob of a negatively charged electroscope. The leaves of the electroscope will. move closer together. move farther apart. become positively charged. become neutral s an electron moves between two charged parallel plates from point to point, as shown in the diagram, the force of the electric field on the electron. decreases. increases.. remains the same 21. beam of electrons is fired from point toward plate as shown in the diagram. fter the beam passes through a hole in positively charged plate, the electrons will. speed up. slow down. be pushed up. be pushed toward the right page 3

4 25. Which diagram best represents the charge distribution on a neutral electroscope when a negatively charged rod is held near it? 27. In the diagram, is a point near a positively charged sphere. Which vector best represents the direction of the electric field at point? The diagram shows the electric field in the vicinity of two charged conducting-spheres, and. What is the static electric charge on each of the conducting spheres? 28. The diagram shown represents an electron with a velocity of meters per second directed into a region between two large, flat charged parallel plates.. is negative and is positive.. is positive and is negative.. oth and are positive.. oth and are negative. The magnitude of the electric field intensity between the plates is N/ N/ N/ N/ page 4

5 29. The diagram pictured shows four charged metal spheres suspended by strings. The charge of each sphere is indicated. If spheres,,, and simultaneously come into contact, the net charge on the four spheres will be 32. What is the voltage of the power supply shown in the diagram?. 0.5 volt. 2 volts. 15 volts. 50 volts n inflated balloon which has been rubbed against a person s hair is touched to a neutral wall and remains attracted to it. Which diagram best represents the charge distribution on the balloon and wall? In the diagrams of charged objects shown, which diagram correctly represents the direction of flow of electrons when the objects are connected by a conductor? student in the electricity lab plotted the graph shown of current I established in a particular circuit as a function of the voltage V applied to the circuit. Which mathematical relationship most probably exists between the current and voltage? Shown are copper wires of identical cross-sectional area. Which wire will have the least resistance?.. direct linear. direct square. inverse. inverse square... page 5

6 35. The diagram here shows the current in three of the branches of a direct current electric circuit. The current in the fourth branch, between junction P and point W, must be 39. The accompanying diagram shows a circuit with three resistors.. 1 toward point W. 1 toward point P. 7 toward point W. 7 toward point P What is the resistance of resistor R 3? 36. The diagram shows the current in a segment of a direct current circuit. What is the reading of ammeter? Ω. 2.0 Ω. 12 Ω. 4.0 Ω 40. The two ends of a wire are connected to a galvanometer, forming a complete electric circuit. The wire is then moved through a magnetic field, as shown in the accomapnying diagram. 37. The diagram shows currents in a segment of an electric circuit What is the reading of ammeter? The galvanometer is being used to measure. current. potential difference. temperature change. resistance 38. n electric dryer consumes joules of energy when operating at 220 volts for 30 minutes (1800 seconds). uring operation, the dryer draws a current of approximately ohm resistor and a 60.-ohm resistor are connected in an electric circuit as shown ompared to the electric current through the 30.-ohm resistor, the electric current through the 60.-ohm resistor is. smaller. larger. the same page 6

7 42. The accompanying graph shows the relationship between the potential difference across a metallic conductor and the electric current through the conductor at constant temperature T Which graph best represents the relationship between the electrical power and the current in a resistor that obeys Ohm s Law?. Which graph best represents the relationship between potential difference and current for the same conductor maintained at a higher constant temperature, T 2? page 7

8 44. ase your answer(s) to the following question(s) on the information and data table below. 46. In the circuit diagram shown, what is the current through the 4.0-ohm resistor? n experiment was performed using various lengths of a conductor of uniform crosssectional area. The resistance of each length was measured and the data recorded in the table below. Length (meters) Resistance (ohms) Mark an appropriate scale on the axis labeled Length (m) ampere ampere. 3.0 amperes. 48 amperes 47. The diagram here shows a resistor of 5 ohms and a resistor of 10 ohms connected in parallel in a circuit. What is the total resistance of the circuit?. less than 5 ohms. 5 ohms. 15 ohms. greater than 15 ohms 45. The total resistance of the series circuit shown is 15 ohms. What is the resistance of R 2? 48. Which statement describes the diagram shown of a switch-controlled circuit?. less than 5.0 ohms. 5.0 ohms. 15 ohms. 25 ohms. The switches are in series and this is an N circuit.. The switches are in series and this is an OR circuit.. The switches are in parallel and this is an N circuit.. The switches are in parallel and this is an OR circuit. page 8

9 49. Which circuit shows the correct use of meters? ( ammeter, V voltmeter) 53. The accompanying diagram shows a circuit with two resistors..... What is the reading on ammeter? Which diagram represents resistances connected in series? The accompanying diagram represents currents in a segment of an electric circuit Which type of circuit is shown in the diagram? What is the reading of ammeter? N. OR. series. closed 52. ase your answer(s) to the following question(s) on the diagram given. What is the total resistance of the circuit? Ω Ω Ω Ω page 9

10 55. Which circuit diagram below correctly shows the connection of ammeter and voltmeter V to measure the current through and potential difference across resistor R? 58. In which circuit would ammeter show the greatest current? ase your answer(s) to the following question(s) on the information and data table. Three lamps were connected in a circuit with a battery of constant potential. The current, potential difference, and resistance for each lamp are listed in the data table below. (There is negligible resistance in the wires and the battery.) 59. In the circuit diagram shown below, ammeter 1 reads 10 amperes. Using the circuit symbols found in the Reference Tables for Physical Setting/Physics, draw a circuit showing how the lamps and battery are connected. What is the reading of ammeter 2? 57. alculate the equivalent resistance of the circuit. [Show all work, including the equation and substitution with units.] page 10

11 60. In the circuit represented by the diagram below, what is the reading of voltmeter V?. 20. V. 2.0 V. 30. V. 40. V page 11

12 cces format version c Educide Software Licensed for use by Problem-ttic Electricity Review-Sheet 03/22/

13 Teacher s Key Page = = R eq R 1 R 2 R Ω Ω Ω R eq = 48Ω or 47.7Ω or I = I 1 + I 2 + I 3 = = 0.84 R = V I = 40.1 V = 48Ω or 47.7Ω

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

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