The abbreviation for Horsepower. The measure of rate of work. One horsepower is equivalent to lifting 33,000 pounds to a height of one foot in one minute. The horsepower of a motor is expressed as a function of torque and speed. For motors, the following approximate formula may be used:
hp = (T x rpm)/5250
where hp = horsepower, T = torque (in. lb. ft.), and rpm = revolutions per minute.
One horsepower is equivalent to 745.7 W.
See also Adiabatic Horsepower; Constant Horsepower; Gas Horsepower; Indicated Horsepower; Unloaded Horsepower; Valve Loss Horsepower; Water Horsepower.