# horsepower

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Related to horsepower: torque

## horsepower,

unit of powerpower,
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
in the English system of units. It is equal to 33,000 foot-poundsfoot-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.
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

## horsepower

The power of one horse. With regard to computers, which are clearly not compared to horses, the term is used to refer to speed in general. For example, "that machine has a lot of horsepower" just means that it is fast by comparison to contemporary models. See MHz.
References in periodicals archive ?
Steam horsepower is figured on yet a different scale.
In heavy-duty applications, fly-wheel-type pulleys increase rotor inertia and are often a practical way to achieve more cutting force without adding horsepower.
AC inverters can also be adapted for applications that require constant horsepower, as shown in the constant horsepower operation graph.
Use the hardest grade possible, in concern with proper horsepower, wheel diamter, rpm and condition of equipment.
Peak horsepower is the power available when the motor is working at maximum strength.
3 liters, but the refined automatic transmission takes good advantage of either 275 or 285 horsepower, respectively.
The result is that T frame motors offer the user more horsepower in a smaller package, largely because they can run hotter.
6-liter DOHC Endurance V8 rated at 317 horsepower and 385 lb-ft torque.
Producing 60 horsepower from one giant cylinder, the Fairbanks Morse engine was installed in 1934 at the alfalfa farm and pumped irrigation water until 1953, when it was replaced by an electric pump.
These units consist of the TFI-126 or TRI-146 Shaker, a TFI 8-4", TFI 10-4" or TFI 16-4" Mud Cleaner and TFI 3x4 or 4x5 pumps with 20 horsepower or 30 horsepower motors.

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