Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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There is a potential difference of 12 V across a resistor with 0.25 A of current
in it. The resistance of the resistor is
a. | 48 W. | c. | 12 W. | b. | 24 W. | d. | 0.021 W. |
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2.
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A resistor has a resistance of 280 W. How much
current is in the resistor if there is a potential difference of 120 V across the resistor?
a. | 160 A | c. | 0.12 A | b. | 0.43 A | d. | 2.3 A |
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3.
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If a lamp is measured to have a resistance of 120 W
when it operates at a power of 1.00 ´ 102 W, what is the
potential difference across the lamp?
a. | 110 V | c. | 0.913 V | b. | 120 V | d. | 220 V |
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4.
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A microwave draws 5.0 A when it is connected to a 120-V outlet. If electrical
energy costs $0.090/kW • h, what is the cost of running the microwave for exactly 6
hours?
a. | $2.70 | c. | $0.72 | b. | $1.60 | d. | $0.32 |
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5.
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When there is an equal amount of positive and negative charges on an object, the
object is
a. | positively charged. | c. | neutral. | b. | negatively charged. | d. | supercharged. |
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6.
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The electric force between charged objects is
a. | attractive only. | c. | either attractive or repulsive. | b. | repulsive
only. | d. | neither attractive
nor repulsive. |
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7.
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Every charged particle produces a(n)
a. | negative charge. | c. | magnetic field. | b. | positive charge. | d. | electric field. |
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8.
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When compared to a –2 charge, there are
a. | an equal number of field lines pointing inward toward a +4
charge. | b. | twice as many field lines pointing inward toward a +4 charge. | c. | twice as many field
lines pointing outward from a +4 charge. | d. | half as many field lines pointing outward from
a +4 charge. |
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9.
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Potential difference is measured in
a. | amperes. | c. | coulombs. | b. | volts. | d. | joules. |
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10.
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Current is the rate at which charges move through a(n)
a. | conductor. | c. | voltage. | b. | insulator. | d. | joule. |
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11.
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A flashlight bulb with a potential difference of 4.5 V across its filament has a
power output of 8.0 W. How much current is in the bulb filament?
a. | 3.7 A | c. | 0.23 A | b. | 1.8 A | d. | 0.56 A |
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12.
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A 13-W resistor has 0.050 A of current in it. What is
the potential difference across the resistor?
a. | 6.5 V | c. | 0.065 V | b. | 0.65 V | d. | 0.0065 V |
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13.
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A set of electric trains are powered by a 9-V battery. What is the resistance of
the trains if they draw 3.0 A of current?
a. | 3 W | c. | 27 W | b. | 0.03 W | d. | 2.7
W |
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14.
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An electric toaster has a power rating of 1,100 W at 110 V. What is the
resistance of the heating coil?
a. | 7.5 W | c. | 10 W | b. | 9.0 W | d. | 11
W |
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15.
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A color television draws about 2.5 A when it is connected to a 120-V outlet.
Assuming electrical energy costs $0.060 per kW • h, what is the cost of running the television
for exactly 8 hours?
a. | $1.44 | c. | $0.14 | b. | $0.03 | d. | $0.30 |
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16.
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A device that protects a circuit from current overload is called a
a. | resistor. | c. | circuit breaker. | b. | capacitor. | d. | closed circuit. |
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17.
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What happens to the resistance of a superconductor when its temperature drops
below the critical temperature?
a. | Resistance increases. | c. | Resistance drops to zero. | b. | Resistance
doubles. | d. | Resistance is
reduced by one half. |
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18.
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What happens to the overall resistance of a circuit when too many appliances are
connected across a 120-V outlet?
a. | Resistance is increased. | c. | Resistance is
decreased. | b. | Resistance stays the same. | d. | Resistance is zero. |
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Matching
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Match each item to the correct statement below. a. | a material that allows electric charges to move easily | b. | SI unit of electric
charge | c. | alignment of charges at the surface of an object producing an induced
charge | d. | the force of attraction or repulsion between objects due to
charge | e. | a material that does not easily transfer electric charge | f. | an electrical
property of matter that creates electric and magnetic forces and
interactions |
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19.
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electrical insulator
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20.
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electrical conductor
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21.
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electric force
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22.
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polarization
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23.
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coulomb
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24.
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electric charge
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Match each item to the correct statement below. a. | a circuit in which two or more paths are connected to the voltage
source | b. | a device that contains a metal strip that melts when a certain current is
exceeded | c. | a low-resistance alternative pathway for current to travel in a
circuit | d. | a device used to open or close an electric circuit | e. | a circuit in which
the components form a single path | f. | the rate at which electrical work is
done |
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25.
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switch
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26.
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series circuit
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27.
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parallel circuit
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28.
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electric power
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29.
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fuse
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30.
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short circuit
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