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# What are the units of a watt?

A watt is a unit of power equal to 1 joule per second. Watts can be measured in units of milliwatt (mW), kilowatt (kW), megawatt (MW), and gigawatt (GW). Watts scale up by units of one thousand. One thousand milliwatts equals one watt, one thousand watts equals one kilowatt (kW), and so on.

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