kilowattA kilowatt-hour (kWh) is a measure of the amount of energy an appliance needs to run for one hour, and is commonly used as a billing unit for residential or commercial electrical services. For example, if you leave ten 100-watt light bulbs on for one hour, you will use kilowatt-hours of electricity. Electric cars also measure their battery capacity in kilowatt-hours that the batteries can hold. See also kilowatts, watts.  

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