1. a unit of energy, equivalent to the energy transferred or expended in one hour by one kilowatt of power; approximately 1.34 horsepower-hours. Abbreviation: kWh, K.W.H., kwhr


  1. a unit of energy equal to the work done by a power of 1000 watts in one hourSymbol: kWh

  1. A unit used to measure energy, especially electrical energy in commercial applications. One kilowatt-hour is equal to one kilowatt of power produced or consumed over a period of one hour, or 3.6 X 106 joules.

A unit of energy: the expenditure of one kilowatt of power for one hour. A toaster running for an hour will use about this much energy.

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