Question

define one kilowatt hour

Answer 1

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The killowatt hour is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour. 

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Answer 2

The kilowatt hour (symbolized kW⋅h as per SI) is a composite unit of energy equivalent to one kilowatt (1 kW) of power sustained for one hour. One watt is equal to 1 J/s. One kilowatt hour is 3.6 megajoules, which is the amount of energy converted if work is done at an average rate of one thousand watts for one hour