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Question

The number of joules contained in 1kWh is_____

A
36×102
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B
36×103
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C
36×104
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D
3.6×106
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Solution

The correct option is D 3.6×106
The kilowatt hour is a unit of energy equal to 3.6 megajoules. If the energy is being transmitted or used at a constant rate over a period of time, the total energy in kilowatt hours is the power in kilowatts multiplied by the time in hours.
Let energy is used as 1J/s. For an hour or 3600 sec. Then total energy used is 3600J. And kWh means 1000×3600.
Which gives 3.6×106.

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