# horsepower

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## horsepower,

unit of power**power,**

in physics, time rate of doing work or of producing or expending energy. The unit of power based on the English units of measurement is the horsepower, devised for describing mechanical power by James Watt, who estimated that a horse can do 550 ft-lb of work per sec; a

**.....**Click the link for more information. in the English system of units. It is equal to 33,000 foot-pounds

**foot-pound,**

abbr. ft-lb, unit of work or energy in the customary English gravitational system; it is the work done or energy expended by a force of 1 pound acting through a distance of 1 foot. It is equal to 1.356 joules.

**.....**Click the link for more information. per minute or 550 foot-pounds per second or approximately 746 watts. The term

*horsepower*originated with James Watt, who determined by experiment that a horse could do 33,000 foot-pounds of work a minute in drawing coal from a coal pit.

## Horsepower

an obsolete subsidiary unit of power. It was first introduced in the 18th century and continues in use in various branches of technology, mainly in automotive engineering. Horsepower is designated as *ls*. (Russian, *loshadinaia sila*), **PS** (German, *Pferdestärke*), **CV** (French, *cheval-vapeur)*, and **HP** or hp (English). In the USSR and certain other countries 1 hp = 75 kilograms-force per m/sec ≈ 735.5 watts (W); in the USA and Great Britain 1 hp = 550 ft.lb/sec ≈ 745.7 W.

## horsepower

[′hȯrs¦pau̇·ər] (mechanics)

The unit of power in the British engineering system, equal to 550 foot-pounds per second, approximately 745.7 watts. Abbreviated hp.

## horsepower

A unit of power equal to 746 watts.

## horsepower

A measure of mechanical power equal to 550 ft-lb/s or 745.7 watts.

## horsepower

**1.**an fps unit of power, equal to 550 foot-pounds per second (equivalent to 745.7 watts)

**2.**a US standard unit of power, equal to 746 watts