One kilowatt hour is defined as?

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Solution

Definition
One kilowatt-hour is defined as the amount of work done or energy consumed when a device of power $1$ kilowatt is used for an $1$ hour at rated voltage.
It is measurement of electrical energy equivalent to the power consumption.
$1$ kilowatt hour $=$ $3600$ kilojoules
It is the SI symbol for kilowatt hour is $kWh$
It is used as billing unit of electricity consumption.

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