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The kilowatt (kW) is equal to one thousand (103) watts. This unit is typically used to express the output power of engines and the power of electric motors, tools, machines, and heaters. It is also a common unit used to express the electromagnetic power output of broadcast radio and television transmitters.
Horsepower (symbol: hp) is a unit of measurement of power (the rate at which work is done). There are many different standards and types of horsepower.