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Explain the relation between, the commercial and SI unit of energy.

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The commercial unit of energy is a kilowatt-hour (kWh) while the SI unit of energy is the joule. Their relation is

1 kWh = 1kW x 1hr 

= 1000 Wx 3600 s 

= 3600000J

(Watt x Sec = Joule) 

1 kWh = 3.6 x 106 J.

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