The kilowatt hour, or kilowatt-hour, (symbol kW·h, kW h or kWh) is a unit of energy equal to 1000 watt hours or 3.6 megajoules. For constant power, energy in watt hours is the product of power in watts and time in hours. The kilowatt hour is most commonly known as a billing unit for energy delivered to consumers by electric utilities.

Read more about Kwh:  Definition, Examples, Symbol and Abbreviation For Kilowatt Hour, Conversions, Watt Hour Multiples and Billing Units, Other Energy-related Units, Confusion of Kilowatt Hours and Kilowatts