Modified True/False
Indicate
whether the sentence or statement is true or false. If false, change the identified word or
phrase to make the sentence or statement true.
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1.
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A
conductor is a material that doesn't allow electrons to flow through it easily.
_________________________
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2.
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Thunder produces air temperatures hotter than the Sun's surface.
_________________________
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3.
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Different household appliances use electrical energy at different rates.
_________________________
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4.
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A
lightning bolt occurs when billions of protons are transferred at the same time.
_________________________
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5.
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A
fuse is a device used to keep electrical circuits from overheating.
_________________________
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6.
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Voltage difference is measured in amperes.
_________________________
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7.
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The
unit of power is the kilowatt-hour. _________________________
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8.
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The
unit used to measure current is the volt. _________________________
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9.
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The
rearrangement of electrons on a neutral object caused by a nearby charged object is called charging
by induction. _________________________
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10.
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Ohm's law is the tendency for a material to oppose the flow of electrons.
_________________________
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Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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11.
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A
circuit that has two or more branches for electrons to follow is a(n) ____. a. | parallel
circuit | c. | circuit
diagram | b. | electron circuit | d. | series circuit | | | | |
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12.
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Which
of the following is a device designed to open an overloaded circuit and prevent
overheating? a. | magnet | c. | transformer | b. | resistor | d. | circuit breaker | | | | |
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13.
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A
material through which electrons do NOT easily flow is a(n) ____. a. | fuse | c. | transformer | b. | insulator | d. | conductor | | | | |
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14.
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Lightning is ____. a. | harmless | c. | a high-voltage electric current | b. | a large
discharge of static electricity | d. | a buildup of
neutrons | | | | |
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15.
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Electric charge that has accumulated on an object is referred to as
____. a. | static
electricity | c. | current
electricity | b. | circuit electricity | d. | current circuit | | | | |
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16.
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Resistance is measured in a unit called the ____. a. | coulomb | c. | volt | b. | ohm | d. | ampere | | | | |
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17.
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If
the leaves of an electroscope spread apart, it indicates that ____. a. | the leaves of
the electroscope are neutral | b. | no charge is moving through the
electroscope | c. | there is static electricity in the
electroscope | d. | the leaves of the electroscope have received a
charge | | |
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18.
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A
path that allows only one route for an electric current is called a ____. a. | parallel
circuit | c. | series
current | b. | parallel current | d. | series circuit | | | | |
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19.
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One
source of constant electric current is a ____. a. | switch | c. | coulomb | b. | transformer | d. | dry
cell | | | | |
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20.
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The
carbon rod in a standard D-cell serves as ____. a. | part of the chemical reaction | c. | a negative terminal | b. | a conductor to
transfer electrons | d. | an insulator to
prevent electric shock | | | | |
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21.
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The
statement that current is equal to the voltage difference divided by the resistance is known as
____. a. | Einstein's
equation | c. | Ohm's
law | b. | Faraday's
law | d. | Newton's
law | | | | |
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22.
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The
rate at which an electrical device converts energy from one form to another is called
____. a. | electrical
resistance | c. | electrical
energy | b. | electrical power | d. | voltage regulation | | | | |
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23.
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Which
of the following is the correct equation to calculate electrical energy? a. | V = P
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I | c. | E = P
´
t | b. | P = I ´ V | d. | P = I/V | | | | |
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24.
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Which
of the following is the correct relationship among power, current, and voltage? a. | P = I
´
V | c. | E = P
´
t | b. | V = P ´ I | d. | P = I/V | | | | |
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25.
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A
static discharge differs from an electric current in that a static discharge ____. a. | involves the
movement of ions as well as electrons | b. | lasts for only a fraction of a second | c. | results because
a force is exerted on the electrons | d. | is a flow of electrons | | |
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