Power (physics)
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Power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. Power is a scalar quantity.
Ansel Adams photograph of electrical wires of the Boulder Dam Power Units, 1941–1942
Horsepower
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Horsepower 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. Tw
Power (physics)
…International System of Units (SI), the unit of power is the watt (W), which is equal to one joule per second. Other common and traditional measures are horsepower (hp), comparing to the power of a horse; one mechanical horsepower equals about 745.7 watts. Other units of power include ergs per second (erg/s…
A team of six horses mowing hay in East Lampeter Township, Pennsylvania, U.S.