If an electric heater consumes 1000 W of power, how much electrical energy does it use in 1 hour?
1 kWh
Electrical energy consumed = Power × Time. With Power = 1000 W = 1 kW and Time = 1 hour:
Energy = 1 kW × 1 h = 1 kWh (kilowatt-hour), which is the commercial unit of electrical energy. In SI units this equals 3,600,000 J (3.6 MJ).
The option '1000 J' is far too small (that would be consumed in just 1 second at 1000 W). '3600 J' is 1 W for 3600 s, not 1000 W. '1000 kWh' would require 1000 hours of operation. The correct answer is : 1 kWh.
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