# horsepower

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Related to Horse power: 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 ?
For Gill Net fishing method and small fishing boats, 46% of boats are using 60 horse power engine and having higher technical efficiency (TEcrs) of 94%, which are greater than boats using 40 horse power, TEcrs of 68%.
Horse Power for Ability, a not-for-profit organisation, was recently set up near Alnwick by Dorothee Debuse and her husband Stuart.
Greatwood founders Helen and Michael Yeadon pioneered Horse Power as an emotional literacy and communications programme, in which special needs children interact with horses to learn social skills, co-operation, building confidence and the development of trust.
Eugene's power required the help of horse power back in 1918.
Briggs & Stratton has introduced a powerful and environmentally friendly new range of V-Twin engines available in two displacements with six different horse power options between 18.
It's an extremely expensive piece of machinery - powerful enough to provide a 1,100 horse power thrust (compared to the 850 her first engine produced) and enable her race car to easily cover the track in eight seconds.
33 lb of steel shot per wheel horse power per hour.
The type of Horse Power (HP) ratings available in the organized market with respect to the various types of IHP motors is also included.
The ministry would dispose off 15 locomotives of 3000 horse power, five each during the years 2017-18, 2018-19 and 2019-20, he added.
Rescue 1122 Rawalpindi team won competition of victim evacuation from river Jhelum received first prize and Rescue 1122 Gujrat left behind all teams in 40 Horse Power Boat Competition and received first prize.
The boats, developed by Rob Innes and Dan Piazza, that can shoot up to 10 foot in the air and stay two foot below the water surface for 20 seconds at a time are powered by a 260 horse power supercharged engine, the Daily Star reported.
WORRIED police switched to horse power to protect town centres on Teesside back in the Eighties.

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