Horsepower (hp, HP)
Below is some brief information about horsepower (hp).
Horsepower (hp or HP) is the name of several non-SI (Non International System of Units) units of power. This was originally defined to allow the output of steam engines to be measured, and compared with the power output of draft horses ( This is used in USA, or draught horse (UK), or dray horse).
The horsepower (hp or HP) was widely adopted to measure the output of piston engines, turbines, electric motors, and other machinery. And different regions adopted different definitions of the unit. Now most countries use the SI unit watt for measurement of power.