Horsepower is the obsolete measurement of efficiency, its symbol HP. It is often used in the car industry to measure motor efficiency. Its name derives from the fact that it is the average amount of work that a horse can do over a long period of time. Originally it was introduced by James Watt, who used it to measure the performance of his steam engines.
source: wikipedia
Types:
1 metric horsepower = 75 kgf·m/s = 735.49875 W
(With this performance, a mass of 75kg can be lifted 1m high in 1 second. The mass of 75kg, calculated with the standard of gravity, 9.80665 m/s2 is 735.49875 newtons.)
1 mechanical horsepower = 1 hydraulic horsepower = 33,000 ft-lbf/min = 745,69987158227022 W (performance: 1kW = 1000 W ≈ 1.34 horsepower)
(source: wikipedia)
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