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ICSE Class 10 Physics 2020 Paper

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Question : 3 of 67
Marks: +1, -0
Define a kilowatt hour. How is it related to joule?
Solution:  
A kilowatt hour (1kWh)(1 \mathrm{kWh}) is the energy spent (or work done) by a source of power 1kW1 \mathrm{kW} in 1 hour.
1kWh=1kW×1 hour1 \mathrm{kWh} = 1 \mathrm{kW} \times 1 \text{ hour}
=1000J s−1×3600s= 1000 \mathrm{J\,s}^{-1} \times 3600 \mathrm{s}
=3.6×106J= 3.6 \times 10^6 \mathrm{J}
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