"rangerssuck" wrote in message
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and on (non electric) motors, it's 550 foot-pounds per second. the
picture that makes in my head is this: A motor with a 1 foot radius
drum attached, winding a rope. If that rope can lift a one pound
weight 550 feet in one second, that's a one horsepower motor. If
nothing is moving, it's not doing useful work.
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Th Harbor Freight 1300Lb electric hoist can give an easily measured
demonstration of electrical and mechanical horsepower.

-jsw