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Normally you would specify a motor to do a particular job by the mechanical power output you require.

A motor takes electrical power "in" and produces mechanical power "out".

Read whatever it says on the motor's rating plate or user-guide.

The mechanical energy output of a motor is measured in various units around the world: for example in watts, horsepower (or brake horsepower).

Another answer

The above answer is quite correct in stating that a motor's output power is its rated power as it's a guide to how much load it can drive.

Power is simply a rate - the rate of transfer of energy. The horsepower is the Imperial unit of power, whereas the watt is the SI unit of power. In the US the output power of a motor is typically still measured in horsepower whereas in Europe the use of horsepower is almost obsolete, except for small "fractional horsepower" electric motors, and both the input power and the output power of a motor are measured in watts or, more likely, kilowatts.

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