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The best unit to use for power are the SI one, the ' Watt'.

1 watt = 1 joule of energy per second.

Even in the vast number of countries where they still don't use the metric system ...

Liberia, Myanmar, and the USA ... most people use ' Watts ' for power anyway.

But you might also occasionally hear "foot-pounds per second" and "horsepower"

in some places.

1 horsepower = 550 foot-pounds per second.

1 horsepower = 746 watts.

(This second conversion factor is easy to remember: The mainsails on the

Nina, the Pinta, and the Santa Maria were estimated to have developed

about 2 horsepower in a fresh breeze. They sailed in 1492. 1492/2 = 746.)

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