The kilowatt hour
) is a unit for measuring energy
. It corresponds to one kilowatt
(kW) of power
being used over a period of one hour
The kilowatt hour is commonly used for electrical energy, since it may be easier to understand in a practical context than the proper SI unit for energy, the joule, which is a watt second (W·s). The joule is a comparatively small unit, making numbers quite large.
1 kW·h = 3,600,000 joules.
The kilowatt hour is a commonly used unit of billing for electric utility companies, although many companies are moving to use the unit megajoule(MJ) instead.\n