Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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Which
of the following is not a characteristic of electrical potential energy? a. | It is a form of
mechanical energy. | b. | It results from a single charge. | c. | It results from
the interaction between charges. | d. | It is associated with a charge in an electric
field. | | |
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2.
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When
comparing the net charge of a charged capacitor with the net charge of the same capacitor when it is
uncharged, the net charge is a. | greater in the charged capacitor. | b. | less in the
charged capacitor. | c. | equal in both capacitors. | d. | greater or less
in the charged capacitor, but never equal. | | |
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3.
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When
a capacitor discharges, a. | it must be attached to a battery. | b. | charges move
through the circuit from one plate to the other until both plates are
uncharged. | c. | charges move from one plate to the other until equal and
opposite charges accumulate on the two plates. | d. | it cannot be
connected to a material that conducts. | | |
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4.
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A
capacitor consists of two metal plates; ____ is stored on one plate, and ____ is stored on the
other. a. | negative charge,
positive charge | c. | potential
difference, internal resistance | b. | potential energy, kinetic
energy | d. | residual charge,
induced charge | | | | |
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5.
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Increasing the potential difference between the plates of a capacitor will produce
what effect on the capacitor? a. | It will increase the charge on each
plate. | b. | It will decrease the charge on each
plate. | c. | It will increase the capacitance. | d. | It will decrease
the capacitance. | | |
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6.
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A
0.25 mF capacitor is
connected to a 9.0 V battery. What is the charge on the capacitor? a. | 1.2 ´ 10 C | c. | 2.5 ´ 10 C | b. | 2.2 ´ 10 C | d. | 2.8 ´ 10 C | | | | |
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7.
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A 1.5
mF capacitor is
connected to a 9.0 V battery. Use the expression PE =  C(DV) to determine how much energy is stored in the
capacitor. a. | 1.1 ´ 10 J | c. | 6.1 ´ 10 J | b. | 6.1 ´ 10 J | d. | 60.8 J | | | | |
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8.
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How
is current affected if the time interval over which the charge passes through a given area decreases
while the amount of charge remains the same? a. | The current increases. | b. | The current
decreases. | c. | The current initially increases and then is gradually
restored. | d. | The current is not affected. | | |
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9.
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A
wire carries a steady current of 0.1 A over a period of 20 s. What total charge moves through the
wire in this time interval? a. | 200 C | c. | 2 C | b. | 20 C | d. | 0.005 C | | | | |
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10.
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The
amount of charge that moves through the filament of a lightbulb in 2.00 s is 2.67 C. What is the
current in the lightbulb? a. | 5.34 A | c. | 0.835 A | b. | 1.33
A | d. | 0.417
A | | | | |
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11.
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When
electrons move through a metal conductor, a. | they move in a straight line through the
conductor. | b. | they move in zigzag patterns because of repeated collisions
with the vibrating metal atoms. | c. | the temperature of the conductor
decreases. | d. | they move at the speed of light in a
vacuum. | | |
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12.
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What
is the potential difference across a 5.0 W resistor that carries a current of 5.0 A? a. | 1.0 ´ 10 V | c. | 10.0
V | b. | 25
V | d. | 1.0
V | | | | |
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13.
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A
lightbulb has a resistance of 240 W when operating at 120 V. What is the current in the lightbulb? a. | 2.0
A | c. | 0.50
A | b. | 1.0
A | d. | 0.20
A | | | | |
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14.
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Which
of the following wires would have the least resistance, assuming that all of the wires have
the same cross-sectional area? a. | an iron wire 10 cm in length | c. | a copper wire 10 cm in length | b. | an iron wire 5
cm in length | d. | a copper wire 5
cm in length | | | | |
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15.
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Which
of the following wires would have the least resistance? a. | an aluminum wire
20 cm in diameter at 40°C | b. | an aluminum wire 20 cm in diameter at 60°C | c. | an aluminum wire 40 cm in diameter at 40°C | d. | an aluminum wire 40 cm in diameter at 60°C | | |
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16.
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Which
set of information will allow you to calculate the kilowatt•hr usage? a. | the voltage and
current in the circuit | b. | the resistance, the current, and the time the circuit
operates | c. | the voltage and the resistance of the
circuit | d. | the current and the time the circuit
operates | | |
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17.
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If a
75 W lightbulb operates at a voltage of 120 V, what is the current in the bulb? a. | 0.62
A | c. | 1.95
´ 10 A | b. | 1.6 A | d. | 9.0 ´ 10 A | | | | |
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18.
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Tripling the current in a circuit with constant resistance has the effect of changing
the power by what factor?
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19.
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How
much does it cost to operate a 695 W heater for exactly 30.0 min if electrical energy costs $0.060
per kW·h? a. | $0.02 | c. | $0.36 | b. | $0.18 | d. | $0.90 | | | | |
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20.
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A
blow dryer draws 11 A when it is connected to 125 V. If electrical energy costs $0.090/kW·h, what is the
cost of using the blow dryer for exactly 15 min? a. | $0.33 | c. | $0.064 | b. | $0.12 | d. | $0.032 | | | | |
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