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Eg, a light bulb consumes one hundred watts of electrical power for one hour. It is commonly used in the form of: Wh (watt-hours), kWh (Kilowatt-hour) which is 1,000 watt-hours or MWh (Megawatt-hour) which is 1,000,000 watt-hours.
Here are various units of power: 1) SI unit: The SI unit of power is W. It is the amount of power produced by consumption of one Joule of energy in one second. The unit W is very small, larger unit like KW and MW are used commonly. 1KW = 1000W and 1MW = 1000KW. SI unit is most commonly used now.