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Section 12.1
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1
Alternating current…
A)has no net movement of electrons in either direction.
B)travels in only one direction.
C)changes the size of the potential difference of a circuit.
D)is used in cell phones and portable music players.
2
Electrical current produced at power generating stations is usually…
A)25 kV.
B)60 kV to 138 kV.
C)20,000 V or less.
D)500,000 V
3
Why is alternating current used to transmit electrical energy over long distances?
A)Wire loses small amounts of chemical energy.
B)Large amounts of chemical energy accumulate on the wires.
C)There is a low loss of heat energy.
D)Huge amounts of energy are lost as heat.
4
The "live" wires that lead from the transformer to your home are…
A)used to carry alternating current.
B)used to carry direct current.
C)neutral.
D)not insulated.
5
The purpose of a circuit breaker or fuse is to…
A)increase the current through a circuit.
B)limit the amount of current to a set value.
C)decrease the amount of voltage arriving at an appliance.
D)allow all appliances to be switched on at once.





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