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What is the commercial unit of electric ...

What is the commercial unit of electric energy? Obtain the relation between this unit and the SI unit of energy.

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The commercial unit of electric energy is the kilowatt -hour (kW-h) and the SI unit of energy is the joule (J).
`1 KW* h=10^(3) J/S xx3600s `
`=3.6xx10^(6) ` J
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