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What is the commercial unit of electrical energy ? Represent it in terms of joules.

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What is the commercial unit of electrical energy ? Represent it in terms of joules.
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The commercial unit of electrical energy is kilowatt hour. It is written as kWh
`1 kWh = 1 kW xx h`
`= 1000 W xx 3600 s` `" "(because 1 kW = 1000W, 1h= 3600 s)`
`=3.6 xx 10^(6) J`
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