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Question

How many joules are there in 1 kilowatt hour?


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Solution

Step 1: Given Data

Power P=1kW

Time t=1hr

Step 2: Formula used

Energy E=P×t

Step 3: Conversion to Joules

We know that,

P=1kW=1000W

Also,

1hr=60min×60s=3600s

The unit of energy is joules.

Also, energy E=P×t

=1000×3600Ws=3.6×106J

Hence, 1 kilowatt hour is equal to 3.6×106J.


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