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Work (W) is defined as 'energy in transit', and describes the conversion of one form of energy into another -for example, when an electric motor converts electrical energy into mechanical energy, it is doing work. The SI unit of measurement for work is the joule (J). Another commonly-encountered unit of measurement for work is the watt hour (W.h).

Power (P) is the rate of doing work. The SI unit for power is the watt (W) a special name, equivalent to a joule per second.

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