• kilowatt-hour

    The kilowatthour (symbolized kWh) is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour. One watt is equal to 1 J/s. One kilowatthour 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.