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what is the relation between KW h and joules

We know kWh is commercial unit of Energy. 

SI Unit Of Energy = Joule (J)

1 kWh = 1 kW x 1 h

=> 1000 W x 3600 s

1 watt × second = 1 joule

1 kWh = 3600000 J

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hello gopinath,

KWh is the commercial unit of energy ,which is converted into  joules

joules is the si unit of energy

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KWH = 1000 Joules per second

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1 kWh = 3.6 * 106 Joules

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