Kilowatt-hour, a unit of energy equal to one kilowatt of power sustained for one hour. The standard billing unit for electrical energy consumption.
Compound abbreviation from 'kilo' (thousand) + 'watt' (unit of power named after James Watt) + 'hour' (unit of time). The kilowatt-hour became the standard energy measurement as electrical power systems developed in the late 19th century.
A single kWh can power a typical LED light bulb for about 100 hours or run a refrigerator for a full day, making it a remarkably compact unit that represents substantial energy. The concept revolutionized how we quantify and commoditize energy, transforming electricity from a scientific curiosity into a measurable, sellable resource.
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