A Horsepower is a power unit that measures the speed at which work is performed. There are many different standards and types of Horsepower two common used are mechanical which is approximately 746-watts and metric power which is approximately 735.5-watts.
The Horsepower term power assumed by the engineer wants to compare the production of steam engines with the power of dragon horses. It was subsequently extended to include effects from other types of piston engines, as well as turbines, electric motors, and other machines unit of horsepower varied between geographical regions, most countries now use the SI unit for power measurement. Horsepower like an engine that increases as much water as two horses work together at one time in such a work and for which it must always hold ten or twelve horses to do the same when an engine can be manufactured large enough to do the work required for to use eight, ten, fifteen or twenty horses should be constantly maintained and held to do such work.