Power, by its definition, is the rate at which work is done or the rate at which energy is transferred.


The SI unit for power is joules per second, which is called a Watt. (The British system uses foot-pounds per second.) Horsepower is another common way to measure power. Horsepower is usually used when measuring the power of huge engines and for other similar purposes. Conversion factors are:

Alternately, since velocity is distance per unit time, power may also be expressed as:

If two machines have different power ratings, both may be able to do the same mount of work, but the one with a higher rating will be able to do that work faster.

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