noun \ˈhrs-ˌpa(-ə)r\

: a unit used to measure the power of engines

Full Definition of HORSEPOWER

:  the power that a horse exerts in pulling
:  a unit of power equal in the United States to 746 watts and nearly equivalent to the English gravitational unit of the same name that equals 550 foot-pounds of work per second
:  effective power <intellectual horsepower> <computing horsepower>

Examples of HORSEPOWER

  1. an engine with 200 horsepower
  2. <that architectural firm probably doesn't have the creative horsepower to produce a truly innovative design>

First Known Use of HORSEPOWER



noun    (Concise Encyclopedia)

Common unit of power, the rate at which work is done. In the English system, one horsepower equals 33,000 foot-pounds of work per minute—that is, the power necessary to lift a total of 33,000 lbs a distance of one foot in one minute. This value was adopted by James Watt in the late 18th century after experiments with strong dray horses and is actually about 50% more than the rate an average horse can sustain for a working day. The electrical equivalent of one horsepower is 746 watts in the International System of Units; the heat equivalent is 2,545 BTU per hour. The metric horsepower (see metric system) equals 4,500 kg-m per minute (32,549 foot-pounds per minute), or 0.9863 horsepower.


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