Download Electric Power and Electrical Energy Use Quiz

Electric Power and Electrical Energy Use Quiz
1. True or false: Electric power is the rate at which an electric device changes electrical
energy to another form of energy.
2. The SI unit for the rate described in question 1 is the _____.
3. Which equation can be used to calculate the power of an electric device?
a) Power = Current x Voltage
b) Power = Current/Voltage
c) Power = Voltage/Current
d) none of the above
4. A watt equals one
a) volt per second.
b) amp per second.
c) ohm per second.
d) joule per second.
5. True or false: One kilowatt equals 100 watts.
6. If an electric device in a 120-volt circuit uses 10 amps of current, then the power of the
device is
a) 1200 watts.
b) 130 watts.
c) 110 watts.
d) 12 watts.
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7. How many kilowatts of power does the device in question 6 have?
8. Which equation can be used to calculate the electrical energy used by an appliance?
a) Energy = Power/Time
b) Energy = Power x Time
c) Energy = Time/Power
d) Energy = Power + Time
9. Electrical energy use is typically expressed in the unit _____.
10. If a 1.2-kilowatt microwave oven runs for half an hour, how much electrical energy
does it use?
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