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define kilowatt hour and convert it into joule.

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One kilowatt-hour is the electrical energy consumed by an electrical appliance in one hour of power 1 kilowatt when it is used for 1 hour.
1 kilowatt hour or 1 kwh
= 1 kilowatt X 1 hour
= 1000 watt X 1 hour
= 1000 joule per second x (60 x 60) seconds
= 3.6 into 106 J

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