1. Compared to the number of free electrons in a conductor, the number of free electrons in an insulator of the same volume is(1) less (3) the same(2) greater

2. Most metals are good electrical conductors because(1) their molecules are close together(2) they have high melting points(3) they have many intermolecular spaces through which

the current can flow(4) they have a large number of free electrons

3. If an insulator replaces a conductor in an electrical circuit, the flow of electrons in the circuit will be(1) less (3) the same(2) greater

4. When the total resistance of a simple electricalcircuit is decreased while keeping the voltageconstant, the current in the electrical circuit will(1) decrease (3) remain the same(2) increase

5. If the resistance of a circuit is doubled and the voltage remains unchanged, the current flowing in the circuit will be(1) one-half as much (3) one-fourth as much(2) twice as much (4) four times as much

6. As the value of a variable resistor is increased, while voltage is held constant, the current flow in the resistor will(1) decrease (3) remain the same(2) increase

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

8. An ampere can be defined as one(1) coulomb per second (3) joule per coulomb(2) ohm per volt (4) Newton per coulomb

9. A wire carries a current of 2.0 amperes. How many electrons pass a given point in this wire in 1.0 second?(1) 1.3 × 1018 (3) 1.3 × 1019

(2) 2.0 × 1018 (4) 2.0 × 1019

10. The current traveling from the cathode to the screen in a television picture tube is 5.0 × 10–5 ampere. How many electrons strike the screen in 5.0 seconds?(1) 3.1 × 1024 (3) 1.6 × 1015

(2) 6.3 × 1018 (4) 1.0 × 105

11. A uniform copper wire has a resistance of 100 ohms. If the wire is cut into 10 equal lengths, the resistance of each piece will be(1) 1 Ω (3) 100 Ω(2) 10 Ω (4) 1,000 Ω

12. A piece of wire has a resistance of 8 ohms. A second piece of wire of the same composition, diameter, and temperature, but one-half as long as the first wire, has a resistance of(1) 8 Ω (3) 16 Ω(2) 2 Ω (4) 4 Ω

13. If the length of a copper wire is reduced by half, then the resistance of the wire will be(1) halved (3) quartered(2) doubled (4) quadrupled

14. A copper wire is part of a complete circuit through which current flows. Which graph best represents the relationship between the wire's length and its resistance?(1)

(2)

(3)

(4)

15. A manufacturer recommends that the longer the extension cord used with an electric drill, the thicker (heavier gauge) the extension cord should be. This recommendation is made because the resistance of a wire varies(1) directly with length and inversely with cross-sectional

area(2) inversely with length and directly with cross-sectional

area(3) directly with both length and cross-sectional area(4) inversely with both length and cross-sectional area

16. A copper wire of length L and cross-sectional area A has resistance R. A second copper wire at the same temperature has a length of 2L and a cross-sectional area of 12

12A. What is

the resistance of the second copper wire?(1) R(2) 2R(3) 1 R

2(4) 4R

17. To reduce the resistance of a metal conductor one should(1) cool the conductor to a low temperature(2) heat the conductor to a high temperature(3) coat the conductor with an insulator(4) wire the conductor in series with another resistor

18. As the temperature of a coil of copper wire increases, its electrical resistance(1) decreases (3) remains the same(2) increases

19. When an incandescent light bulb is turned on, its thin wire filament heats up quickly. As the temperature of this wire filament increases, its electrical resistance(1) decreases (3) remains the same(2) increases

20. The resistance of a copper wire is measured to be 4 ohms at 20ºC. If the wire is heated to 30ºC, the resistance of the wire will be(1) zero ohms (3) more than 4 ohms(2) less than 4 ohms (4) 4 ohms

21. The graph below shows the relationship between the potential difference across a metallic conductor and the electric current through the conductor at constant temperature T1.

Which graph best represents the relationship between potential difference and current for the same conductor maintained at a higher constant temperature, T2?

(1) (2) (3) (4)

22. The diagram below represents a lamp, a 10-volt battery, and a length of nichrome wire connected in series.

As the temperature of the nichrome is decreased, the brightness of the lamp will(1) decrease (3) remain the same(2) increase

23. If the cross-sectional area of a fixed length of wire were decreased, the resistance of the wire would(1) decrease (3) remain the same(2) increase

24. The resistance of a metallic wire conductor is inversely proportional to its(1) tensile strength (3) length(2) cross-sectional area (4) temperature

25. A copper wire has a resistance of 200 ohms. A second copper wire with twice the cross-sectional area and the same length would have a resistance of(1) 50Ω (3) 200Ω(2) 100Ω (4) 400Ω

26. Which graph below best represents how the resistance (R) of a series of copper wires of uniform length and temperature varies with cross-sectional area (A)?

(1) (3)

(2) (4)

27. The diagram below shows a circuit in which a copper wire connects points A and B.

The electrical resistance between points A and B can be decreased by(1) replacing the wire with a thicker copper wire of the

same length(2) replacing the wire with a longer copper wire of the

same thickness(3) increasing the temperature of the copper wire(4) increasing the potential difference supplied by the

battery

28. Which segment of copper wire has the highest resistance at room temperature?(1) 1.0 m length, 1.0 × 10–6 m2 cross-sectional area(2) 2.0 m length, 1.0 × 10–6 m2 cross-sectional area(3) 1.0 m length, 3.0 × 10–6 m2 cross-sectional area(4) 2.0 m length, 3.0 × 10–6 m2 cross-sectional area

29. If both the cross-sectional area and the length of a metallic conductor were doubled, the resistance of the conductor would be(1) halved (3) unchanged(2) doubled (4) quadrupled

30. The graph below represents the relationship between potential difference and current for four different resistors. Which resistor has the greatest resistance?

(1) A (3) C(2) B (4) D

31. A student needs to increase the resistance in a circuit. All that is available for this task is a wide variety of wires of different lengths and thicknesses. To obtain the maximum resistance, the student should replace the wire with one that is(1) shortest and thickest (3) longest and thickest(2) shortest and thinnest (4) longest and thinnest

32. A 10.-meter length of wire with a cross-sectional area of 3.0 × 10–6 square meter has a resistance of 9.4 × 10–2 ohm at 20° Celsius. The wire is most likely made of(1) silver (3) aluminum(2) copper (4) tungsten

33. The table below lists various characteristics of two metallic wires, A and B.

If wire A has resistance R, then wire B has resistance(1) R(2) 2R(3) R

2(4) 4R

34. Which voltage would cause a current of 0.5 ampere in a circuit that has a resistance of 24 ohms?(1) 6.0 V (3) 24 V(2) 12 V (4) 48 V

35. If the potential difference across a 30.-ohm resistor is 10. volts, what is the current through the resistor?(1) 0.25 A (3) 3.0 A(2) 0.33 A (4) 0.50 A

36. A lamp has a current of 2.0 amperes at 6.0 volts. The resistance of the lamp must be(1) 1.5 Ω (3) 3.0 Ω(2) 6.0 Ω (4) 12 Ω

37. A potential difference of 12 volts is applied across a circuit which has a 4.0-ohm resistance. What is the magnitude of the current in the circuit?(1) 0.33 A (3) 3.0 A(2) 48 A (4) 4.0 A

38. A series circuit has a total resistance of 1.00 × 102 ohms and an applied potential difference of 2.00 × 102 volts. The amount of charge passing any point in the circuit in 2.00 seconds is(1) 1.26 × 1019 C (3) 2.52 × 1019 C(2) 2.00 C (4) 4.00 C

39. A 20.-ohm resistor has 40. coulombs passing through it in 5.0 seconds. The potential difference across the resistor is(1) 8.0 V (3) 160 V(2) 100 V (4) 200 V

40. In a flashlight, a battery provides a total of 3.0 volts to a bulb. If the flashlight bulb has an operating resistance of 5.0 ohms, the current through the bulb is(1) 0.30 A (3) 1.5 A(2) 0.60 A (4) 1.7 A

41. A 50-watt lightbulb and a 100-watt lightbulb are each operated at 100 volts. Compared to the resistance of the 50-watt bulb, the resistance of the 100-watt bulb is(1) half as great (3) one-fourth as great(2) twice as great (4) four times as great

42. The diagram below represents a simple circuit consisting of a variable resistor, a battery, an ammeter, and a voltmeter.

What is the effect of increasing the resistance of the variable resistor from 1000 Þ to 10000 Þ? [Assume constant temperature.](1) The ammeter reading decreases.(2) The ammeter reading increases.(3) The voltmeter reading decreases.(4) The voltmeter reading increases.

43. Which graph best represents the relationship between the current (I) and the potential difference (V) in a circuit in which resistance remains constant?

(1) (3)

(2) (4)

44. The slope of the line on the graph at the right represents

(1) resistance of a material(2) electric field intensity(3) power dissipated in a resistor(4) electrical energy

45. The graph below represents the relationship between the potential difference (V) across a resistor and the current (I) through the resistor.

Through which entire interval does the resistor obey Ohm’s law?(1) AB (3) CD(2) BC (4) AD

46. Which circuit segment has an equivalent resistance of 6 ohms?

(1) (3)

(2)

(4)

47. The diagram below shows a circuit with three resistors.

What is the resistance of resistor R3?(1) 6.0 Ω (3) 12 Ω(2) 2.0 Ω (4) 4.0 Ω

48. A student needs a 4-ohm resistor to complete a circuit. Only a large quantity of 1-ohm resistors are available. Which of the following should be done to complete the circuit?(1) Connect four 1-ohm resistors in series.(2) Connect four 1-ohm resistors in parallel.(3) Connect two of the 1-ohm resistors in series and two in

parallel.(4) Connect only two 1-ohm resistors in parallel.

49. Which quantity must be the same for each component in any series circuit?(1) voltage (3) resistance(2) power (4) current

50. A 5-ohm and a 10-ohm resistor are connected in series. The current in the 5-ohm resistor is 2 amperes. The current in the 10-ohm resistor is(1) 1 A (3) 0.5 A(2) 2 A (4) 8 A

51. The diagram below represents a series circuit containing three resistors.

What is the current through resistor R2?(1) 1.0 A (3) 3.0 A(2) 0.33 A (4) 9.0 A

52. The diagram below represents a simple electric circuit.

How much charge passes through the resistor in 2.0 seconds?(1) 6.0 C (3) 8.0 C(2) 2.0 C (4) 4.0 C

53. A 30.-ohm resistor and a 60.-ohm resistor are connected in an electric circuit as shown below.

Compared to the electric current through the 30.-ohm resistor, the electric current through the 60.-ohm resistor is(1) smaller (3) the same(2) larger

54. A 9.0-volt battery is connected to a 4.0-ohm resistor and a 5.0-ohm resistor as shown in the diagram below.

What is the current in the 5.0-ohm resistor?(1) 1.0 A (3) 1.8 A(2) 2.3 A (4) 4.0 A

55. The diagram below represents an electric circuit.

If the voltage between A and B is 10 volts, the voltage between B and C is(1) 5 V (3) 15 V(2) 10 V (4) 20 V

56. Three resistors of 20. ohms, 30. ohms, and 60. ohms, respectively, are connected in series with a battery. A current of 2.0 amperes will flow through this circuit when the potential difference of the battery is(1) 10. V (3) 110 V(2) 20. V (4) 220 V

57. As more resistors are added in series across a battery, the potential drop across each resistor(1) decreases (3) remains the same(2) increases

58. The diagram below shows a circuit with two resistors.

Compared to the potential drop across the 8-ohm resistor, the potential drop across the 4-ohm resistor is(1) the same (3) one-half as great(2) twice as great (4) four times as great

59. What is the voltage of the power supply shown on the below?

(1) 0.5 volt (3) 15 volts(2) 10 volts (4) 50 volts

60. The diagram below shows three resistors, R1, R2, and R3, connected to a 12-volt battery.

If voltmeter V1 reads 3 volts and voltmeter V2 reads 4 volts, what is the potential drop across resistor R3?(1) 12 V (3) 0 V(2) 5 V (4) 4 V

61. In the circuit shown below, voltmeter V2 reads 80. volts.

What is the reading of voltmeter V1?(1) 160 V (3) 40. V(2) 80. V (4) 20. V

62. Compared to the potential drop across the 10 ohm resistor shown in the diagram, the potential drop across the 5 ohm resistor is

(1) the same (3) one-half as great(2) twice as great (4) four times as great

63. What is the current in the circuit represented in the diagram below?

(1) 1 A (3) 3 A(2) 2 A (4) 6 A

64. In the circuit shown below, how many coulombs of charge will pass through resistor R in 2.0 seconds?

(1) 36 C (3) 3.0 C(2) 6.0 C (4) 4.0 C

65. The diagram below shows a circuit with two resistors.

What is the reading on ammeter A?(1) 1.3 A (3) 3.0 A(2) 1.5 A (4) 0.75 A

66. The diagram below represents an electric circuit consisting of a 12-volt battery, a 3.0-ohm resistor, R1, and a variable resistor, R2.

At what value must the variable resistor be set to produce a current of 1.0 ampere through R1?(1) 6.0 Þ (3) 3.0 Þ(2) 9.0 Þ (4) 12 Þ

67. In the circuit represented by the diagram below, what is the reading of voltmeter V?

(1) 20. V (3) 30. V(2) 2.0 V (4) 40. V

68. A 6.0-ohm lamp requires 0.25 ampere of current to operate. In which circuit below would the lamp operate correctly when switch S is closed?(1)

(2)

(3)

(4)

69.

In the circuit diagram above, what is the potential difference across the 3.0-ohm resistor?(1) 1.0 V (3) 3.0 V(2) 2.0 V (4) 1.5 V

70. In the circuit shown at the right, the potential difference across the 4.0-ohm resistor is

(1) 6.0 volts (3) 3.0 volts(2) 2.0 volts (4) 12 volts

71. Two identical resistors connected in series have a combined resistance of 8 ohms. When connected in parallel, the resistance of the combination will be(1) 8 Ω (3) 16 Ω(2) 2 Ω (4) 4 Ω

72. Three resistances of 2 ohms, 4 ohms, and 6 ohms are connected in parallel. The equivalent resistance of the three resistors is(1) less than 2 Ω (3) between 4 Ω and 6 Ω(2) between 2 Ω and 4 Ω (4) greater than 6 Ω

73. Which circuit segment below has the same total resistance as the circuit segment shown in the diagram to the right?

(1)

(2)

(3)

(4)

74. Circuit A and circuit B are shown below.

Compared to the total resistance of circuit A, the total resistance of circuit B is(1) less (3) the same(2) greater

75. Which two of the resistor arrangements shown below have equal resistances?

(1) A and B (3) C and D(2) B and C (4) D and A

76. The total resistance of several resistors connected in parallel is(1) equal to the sum of the separate resistances(2) equal to the largest resistance(3) smaller than the smallest resistance(4) greater than the largest resistance

77. Which diagram represents resistances connected in series?(1)

(2)

(3)

(4)

78. As more resistors are added in parallel, the total resistance of a circuit(1) decreases (3) remains the same(2) increases

79. The diagram below 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?

(1) less than 5 ohms (3) 15 ohms(2) 5 ohms (4) greater than 15 ohms

80. Resistors R1 and R2 have an equivalent resistance of 6 ohms when connected in the circuit shown below.

The resistance of R1 could be(1) 1 Ω (3) 8 Ω(2) 5 Ω (4) 4 Ω

81. A physics student is given three 12-ohm resistors with instructions to create the circuit that would have the lowest possible resistance. The correct circuit would be a(1) series circuit with an equivalent resistance of 36 Þ?(2) series circuit with an equivalent resistance of 4.0 Þ?(3) parallel circuit with an equivalent resistance of 36 Þ?(4) parallel circuit with an equivalent resistance of 4.0 Þ?

82. In which circuit would ammeter A show the greatest current?

(1) (3)

(2) (4)

83. Two identical resistors connected in series have an equivalent resistance of 4 ohms. The same two resistors, when connected in parallel, have an equivalent resistance of(1) 1 Þ (3) 8 Þ(2) 2 Þ (4) 4 Þ

84. Ammeters A1, A2 and A3 are placed in a circuit as shown below.

What is the reading on ammeter A3?(1) 1.0 A (3) 3.0 A(2) 2.0 A (4) 5.0 A

85. In the diagram below of a parallel circuit, ammeter A measures the current supplied by the 110-volt source.

The current measured by ammeter A is(1) 1.0 A (3) 5.5 A(2) 0.10 A (4) 11 A

86. The diagram below represents currents in a segment of an electric circuit.

What is the reading of ammeter A?(1) 1 A (3) 3 A(2) 2 A (4) 4 A

87. What is the current in ammeter A in the diagram below?

(1) 1 A (3) 3 A(2) 1/3 A (4) 9 A

88. An electric circuit contains an operating heating element and a lit lamp. Which statement best explains why the lamp remains lit when the heating element is removed from the circuit?(1) The lamp has less resistance than the heating element.(2) The lamp has more resistance than the heating element.(3) The lamp and the heating element were connected in

series.(4) The lamp and the heating element were connected in

parallel.

89. In the circuit diagram shown below, ammeter A1 reads 10. amperes.

What is the reading of ammeter A2?(1) 6.0 A (3) 20. A(2) 10. A (4) 4.0 A

90. When three 30-ohm resistors are connected in parallel across a 9-volt source, the total current is(1) 0.10 A (3) 0.45 A(2) 0.30 A (4) 0.90 A

91. A 10-ohm and a 20-ohm resistor are connected in parallel to a constant voltage source. If the current through the 10-ohm resistor is 4 amperes, then the current through the 20-ohm resistor is(1) 1 A (3) 8 A(2) 2 A (4) 4 A

92. In the circuit diagram below, ammeter A measures the current supplied by the 10.-volt battery.

The current measured by ammeter A is(1) 0.13 A (3) 0.50 A(2) 2.0 A (4) 4.0 A

93. In the circuit diagram shown below, what is the current through the 4.0-ohm resistor?

(1) 1.0 ampere (3) 3.0 amperes(2) 0.33 ampere (4) 48 amperes

94. As the number of resistors in a parallel circuit is increased, what happens to the equivalent resistance of the circuit and total current in the circuit?(1) Both equivalent resistance and total current decrease.(2) Both equivalent resistance and total current increase.(3) Equivalent resistance decreases and total current

increases.(4) Equivalent resistance increases and total current

decreases.

95. Which circuit shown below could be used to determine the total current and potential difference of a parallel circuit?

(1) (3)

(2) (4)

96. A student uses a voltmeter to measure the potential difference across a circuit resistor. To obtain a correct reading, the student must connect the voltmeter(1) in parallel with the circuit resistor(2) in series with the circuit resistor(3) before connecting the other circuit components(4) after connecting the other circuit components

97. Which circuit shows the correct use of meters?(A-ammeter, V-voltmeter)(1)

(2)

(3)

(4)

98. In the circuits represented below, the symbol for the ammeter is A and the symbol for the voltmeter is V. Which diagram represents the proper connections for determining the resistance of the circuit?

(1)

(3)

(2) (4)

99. What quantities may be directly measured by the arrangement of meters shown in the diagram below?

(1) voltage drop across R2 and current through R2(2) current through R1 and R2(3) current through R1 and voltage drop across R2(4) the resistance of Rl and R2

100. Two resistors are connected to a source of voltage as shown in the diagram below.

At which position should an ammeter be placed to measure the current passing only through resistor R1?(1) 1 (3) 3(2) 2 (4) 4

101. Which circuit diagram shows voltmeter V and ammeter A correctly positioned to measure the total potential difference of the circuit and the current through each resistor?

(1) (2) (3) (4)

102. In which circuit represented below are meters properly connected to measure the current through resistor R1 and the potential difference across R2?

(1)

(3)

(2) (4)

103. A 120-volt toaster is rated at 600 watts. Under normal conditions, the current in the toaster is(1) 0.20 A (3) 10. A(2) 5.0 A (4) 25 A

104. Which combination of current and electromotive force would use energy at the greatest rate?(1) 10 A at 110 V (3) 3 A at 220 V(2) 8 A at 110 V (4) 5 A at 110 V

105. Three resistors of 10 ohms, 20 ohms, and 30 ohms are connected in series to a 120-volt source. The power developed is(1) greatest in the 10 Ω(2) greatest in the 20 Ω resistor(3) greatest in the 30 Ω resistor(4) the same in all three resistors

106. If energy is used in an electric circuit at the rate of 20 joules per second, then the power supplied to the circuit is(1) 5 watts (3) 25 watts(2) 20 watts (4) 100 watts

107. Two resistors are connected in parallel to a 12-volt battery as shown in the diagram.

If the current in resistor R is 3.0 amperes, the rate at which R consumes electrical energy is(1) 1.1 × 102 W (3) 24 W(2) 36 W (4) 4.0 W

108. A lamp and an ammeter are connected to a source as shown.

What is the electrical energy expended in the lamp in 3.0 seconds?(1) 50. J (3) 50. W(2) 150 J (4) 150 W

109. To increase the brightness of a desk lamp, a student replaces a 60-watt light bulb with a 100-watt bulb. Compared to the 60-watt bulb, the 100-watt bulb has(1) less resistance and draws more current(2) less resistance and draws less current(3) more resistance and draws more current(4) more resistance and draws less current

110. If the potential drop across an operating 300.-watt floodlight is 120 volts, what is the current through the floodlight?(1) 0.40 A (3) 7.5 A(2) 2.5 A (4) 4.5 A

111. In which of the circuits represented below will the resistor consume the most electrical power?

(1) (3)

(2) (4)

112. An air conditioner is designed to operate at 110 volts and is rated at 2,400 watts. Is it possible to use the air conditioner in a circuit which has a 15-ampere circuit breaker (or fuse) on a 110-volt line?(1) Yes, because the current needed is less than 15

amperes.(2) No, because the voltage required is too high.(3) Yes, because the voltage is lower than that needed.(4) No, because the current needed is greater than 15

amperes.

113. As the potential difference across a given resistor is increased, the power expended in moving charge through the resistor(1) decreases (3) remains the same(2) increases

114. One watt is equivalent to one(1) N•m (3) J•s(2) N/m (4) J/s

115. A light bulb is in series with a rheostat variable resistor and a fixed voltage is applied across the total circuit. As the resistance of the rheostat decreases, the brightness of the bulb(1) decreases (3) remains the same(2) increases

116. The potential difference across a 100.-ohm resistor is 4.0 volts. What is the power dissipated in the resistor?(1) 0.16 W (3) 4.0 × 102 W(2) 25 W (4) 4.0 W

117. The same potential difference is applied to two lamps, A and B. The resistance of lamp A is twice the resistance of lamp B. Compared to the power developed by lamp B, the power developed by lamp A is(1) less (3) the same(2) greater

118. While operating at 120 volts, an electric toaster has a resistance of 15 ohms. The power used by the toaster is(1) 8.0 W (3) 960 W(2) 120 W (4) 1,800 W

119. As the resistance of a lamp operating at a constant voltage increases, the power dissipated by the lamp(1) decreases (3) remains the same(2) increases

120. As the resistance of a constant-voltage circuit is increased, the power developed in the circuit(1) decreases (3) remains the same(2) increases

121. The heating element on an electric stove dissipates 4.0 × 102 watts of power when connected to a 120-volt source. What is the electrical resistance of this heating element?(1) 0.028 Ω (3) 3.3 Ω(2) 0.60 Ω (4) 36 Ω

122. The potential difference applied to a circuit element remains constant as the resistance of the element is varied. Which graph best represents the relationship between power (P) and resistance (R) of this element?

(1) (3)

(2) (4)

123. Identical resistors (R) are connected across the same 12-volt battery. Which circuit uses the greatest power?(1)

(2)

(3)

(4)

124. If the potential difference applied to a fixed resistance is doubled, the power dissipated by that resistance(1) remains the same (3) halves(2) doubles (4) quadruples

125. Assuming total conversion of electrical energy to heat energy, how many joules of heat energy are produced by a 20-watt heating unit in 5 seconds?(1) 100 J (3) 24 J(2) 25 J (4) 4 J

126. A series circuit contains a 4W and a 2W resistor connected to a 110-volt source. Compared to the energy dissipated in the 2W resistor, the energy dissipated in the 4W resistor during the same time is(1) one-half as great (3) twice as great(2) the same (4) four times as great

127. How long must a 100-watt light bulb be used in order to dissipate 1,000 joules of electrical energy?(1) 10 s (3) 1,000 s(2) 100 s (4) 100,000 s

128. What is the current in a 1,200-watt heater operating on 120 volts?(1) 0.10 A (3) 10. A(2) 5.0 A (4) 20. A

129.

The circuit represented in the diagram above is a series circuit. The electrical energy expended in resistor R in 2.0 seconds is(1) 20. J (3) 80. J(2) 40. J (4) 120 J

130. If the power developed in an electric circuit is doubled, the energy used in one second is(1) halved (3) quartered(2) doubled (4) quadrupled

131. An electric iron draws a current of 5 amperes and has a resistance of 20 ohms. The amount of energy used by the iron in 40 seconds is(1) 100 J (3) 4,000 J(2) 500 J (4) 20,000 J

132. A clothes dryer connected to a 240-volt line draws 30. amperes of current for 20. minutes. Approximately how much electrical energy is consumed by the dryer?(1) 4.8 × 103 J (3) 1.4 × 105 J(2) 7.2 × 103 J (4) 8.6 × 106 J

133. An electric dryer consumes 6.0 x 106 joules of energy when operating at 220 volts for 30. minutes. During operation, the dryer draws a current of approximately(1) 10. A (3) 20. A(2) 15 A (4) 25 A

134. How long will it take the immersion heater shown in the diagram below to deliver 1000 joules of heat to the water?

(1) 0.2 sec (3) 20 sec(2) 2 sec (4) 200 sec

135. How much time is required for an operating 100-watt light bulb to dissipate 10 joules of electrical energy?(1) 1 s (3) 10 s(2) 0.1 s (4) 1000 s

136. An operating electric heater draws a current of 10. amperes and has a resistance of 12 ohms. How much energy does the heater use in 60. seconds?(1) 120 J (3) 7200 J(2) 1200 J (4) 72,000 J

137. A 4.50-volt personal stereo uses 1950 joules of electrical energy in one hour. What is the electrical resistance of the personal stereo?(1) 433 Ohms (3) 37.4 Ohms(2) 96.3 Ohms (4) 0.623 Ohms

138. How much work is done in moving 6 electrons through a potential difference of 2.0 volts?(1) 6.0 eV (3) 3.0 eV(2) 2.0 eV (4) 12 eV

139. An elementary charge is accelerated by a potential difference of 9.0 volts. The total energy acquired by the charge is(1) 9.0 eV (3) 3.0 eV(2) 12 eV (4) 27 eV

140. An alpha particle with a charge of +2 elementary charges is accelerated in a vacuum through a potential difference of 10,000. volts. what is the energy acquired by the particle?(1) 3.2 × 10–15 eV (3) 20,000. eV(2) 2.0 eV (4) 40,000. eV

141. An alpha particle with a charge of +2 elementary charges is accelerated by a potential difference of 1.0 × 106 volts. The energy acquired by the particle is(1) 0.50 × 106 eV (3) 2.0 × 106 eV(2) 1.6 × 10–19 eV (4) 3.2 × 10–13 is eV

Answer KeyMisc. User-Made Questions [Aug 10, 2009]

Answer KeyMisc. User-Made Questions [Aug 10, 2009]

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Answer KeyMisc. User-Made Questions [Aug 10, 2009]

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