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1. 
An object that is grounded provides a path for an electric charge to...
A.
flow through a circuit.
B.
move to Earth.
C.
jump from one object to another.
D.
generate energy.
2. 
In an alternating current...
A.
electrons flow through a wire in a single direction.
B.
batteries are used to supply the flow of electrons.
C.
electricity can be transported only over very short distances.
D.
electrons vibrate back and forth in a wire to transmit power.
3. 
Transformers are used to deliver electricity to homes because they:
A.
Can increase and decrease the voltage along the power transmission lines.
B.
Function as insulators.
C.
Change DC electron flow to AC electron flow.
D.
Function as circuit breakers to prevent an overload that can cause excess heat.
4. 
Which is an example of an electromagnet?
A.
Refrigerator magnet.
B.
Stereo speaker.
C.
Compass needle.
D.
Iron nail.
5. 
What sources do generators use to produce heat?
A.
Fossil fuels.
B.
Nuclear reactions.
C.
Running water and wind.
D.
All of the above.
6. 
A simple circuit containing a light switch in the "on" position is:
A.
An open circuit.
B.
A closed circuit.
C.
A series circuit.
D.
A parallel circuit.
7. 
A device that is magnetized by current electricity is:
A.
A transformer.
B.
A generator.
C.
An electromagnet.
D.
A battery.
8. 
What kind of energy can cause your hair to stand on end after you brush it vigorously?
A.
Heat energy.
B.
Magnetism.
C.
Static energy.
D.
Light energy.