Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Resistance is measured in a unit called the ____.
a. | ampere | c. | ohm | b. | coulomb | d. | volt |
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2.
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What would you use to see if something is charged?
a. | electric reader | c. | electroscope | b. | thermometer | d. | electric force |
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3.
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If a material does not allow charges to move through it easily, what is it
called?
a. | electrical insulator | c. | static electricity | b. | electrical conductor | d. | electric
discharge |
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4.
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What is the loss of static electricity as charges move off an object?
a. | static | c. | friction | b. | electric discharge | d. | induction |
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5.
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What does the size of a current depend upon?
a. | protons | c. | voltage | b. | electrons | d. | charge |
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6.
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As resistance goes up, what happens to the current?
a. | The current goes up. | c. | The current stays the same. | b. | The current goes
down. | d. | The current
disappears. |
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7.
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What is the rate at which electrical energy is changed into other forms of
energy?
a. | electric power | c. | electrical energy | b. | voltage | d. | amps |
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8.
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What is the voltage if the current is 4 A and the resistance is 10 ??
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9.
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How much electrical energy does a 75 W light bulb use if it is on for 4
hours?
a. | 0.150 kWh | c. | 0.300 kWh | b. | 150 W | d. | 300 W |
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10.
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In the formula P = V x I, what does the I stand
for?
a. | current | c. | voltage | b. | intensity | d. | resistance |
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11.
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Circuits need three basic parts—an energy source, wires, and what
else?
a. | charge | c. | load | b. | force | d. | energy |
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12.
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How many pathways are there for moving charges in a series circuit?
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13.
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Why are protons and electrons attracted to each other?
a. | because protons have a positive charge and electrons have a negative
charge | b. | because protons have a negative charge and electrons have a positive
charge | c. | because they both are positively charged | d. | because they both
are negatively charged |
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14.
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The size of an electric force depends upon which two things?
a. | the amount of each charge and the size of the electric field | b. | the distance between
the charges and the size of the electric field | c. | the number of protons and the distance between
the charges | d. | the amount of each charge and the distance between the
charges |
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15.
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Which of the following is NOT an insulator?
a. | air | c. | glass | b. | wood | d. | copper |
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16.
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What generates electrical energy from chemical energy?
a. | cell | c. | circuit | b. | switch | d. | current |
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17.
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What is the voltage if the current is 0.4 A and the resistance is 3 ??
a. | 12 V | c. | 1.2 V | b. | 12 ? | d. | 1.2 ? |
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18.
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A video monitor draws 1.5 A at a voltage of 150 V. What is the power rating of
the monitor?
a. | 220 W | c. | 150 W | b. | 225 W | d. | 2,250 W |
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19.
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How much electrical energy does a 75 W light bulb use if it is on for 5
hours?
a. | 375 W | c. | 300 W | b. | 0.375 kWh | d. | 0.300 kWh |
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20.
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What is a switch that automatically opens if the current is too high?
a. | fuse | c. | circuit breaker | b. | conductor | d. | insulator |
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21.
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What happens if you rub a glass rod with a piece of silk and the rod becomes
positively charged?
a. | Electrons on the rod are destroyed. | c. | Protons move to the
rod. | b. | The silk becomes negatively charged. | d. | The glass attracts more
protons. |
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22.
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What is the rate at which charges pass a given point?
a. | electrical energy | c. | electric current | b. | ohms | d. | voltage |
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23.
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What goes down as resistance goes up?
a. | Power goes down. | c. | Current goes down. | b. | Charge goes down. | d. | Temperature goes
down. |
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24.
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What is a circuit where loads are connected side by side?
a. | parallel | c. | series | b. | voltage | d. | breaker |
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Matching
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Match each item with the correct statement below. a. | switch | c. | series circuit | b. | parallel circuit | d. | electric
circuit |
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25.
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a circuit in which loads are connected side by side
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26.
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a complete, closed path through which electric charges flow
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27.
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a device used to open and close a circuit
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28.
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a circuit in which all parts are connected in a single loop
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Completion
Complete each
statement.
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29.
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Metal cords are often covered in plastic and have metal prongs. This is because
metal is a good ____________________ and plastic is a good ____________________.
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30.
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In a battery, electric current exists between the two electrodes because there
is a difference in ____________________ between the electrodes.
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31.
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Another word for potential difference is ____________________.
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32.
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The electrical outlets in the United States usually supply a voltage of
____________________ V.
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33.
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Thin wires have ____________________ resistance than thick wires.
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34.
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Short wires have ____________________ resistance than long wires.
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Short Answer
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35.
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What does Ohm’s law tell us?
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36.
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How does lightning form?
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37.
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Find the resistance of a circuit that draws a 1.5 A when 3.0 V are
applied.
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Examine the diagram below and answer the question that follows.
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38.
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If one bulb in this circuit burns out, how will the other bulb be affected?
Explain your answer.
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Essay
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39.
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Why would it be dangerous to replace a blown fuse with a copper penny?
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40.
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How does a lightning rod protect a building from lightning strikes?
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