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# Download Electric Power and Electrical Energy Use Quiz

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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. 1 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? 2