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# Watt vs. Horsepower

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Wattnoun

In the International System of Units, the derived unit of power; the power of a system in which one joule of energy is transferred per second. Symbol: W

Horsepowernoun

A non-metric unit of power (symbol hp) with various definitions, for different applications. The most common of them is probably the mechanical horsepower, approximately equal to 745.7 watts.

Wattnoun

A unit of power or activity equal to 107 C.G.S. units of power, or to work done at the rate of one joule a second. An English horse power is approximately equal to 746 watts.

Horsepowernoun

A metric horsepower (symbol often PS from the German abbreviation), approximately equal to 735.5 watts.

Wattnoun

a unit of power equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a resistance of 1 ohm

Horsepowernoun

Strength

‘political horsepower’;

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Wattnoun

Scottish engineer and inventor whose improvements in the steam engine led to its wide use in industry (1736-1819)

Horsepowernoun

a unit of power equal to 746 watts

Wattnoun

the SI unit of power, equivalent to one joule per second, corresponding to the rate of consumption of energy in an electric circuit where the potential difference is one volt and the current one ampere.

Horsepowernoun

an imperial unit of power equal to 550 foot-pounds per second (about 750 watts).

Watt

The watt (symbol: W) is a unit of power or radiant flux. In the International System of Units (SI), it is defined as a derived unit of (in SI base units) 1 kg⋅m2⋅s−3 or, equivalently, 1 joule per second.

Horsepowernoun

the power of an engine measured in terms of horsepower

‘a strong 140-horsepower engine’;

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Horsepower

Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower.