When did they come up beside the permanent status HORSEPOWER when discribing an engine's power, and how is it calculated?

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Answers:    Check out Moden Marvels on horsepower at the history channel sometime, it go into great detail.

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This website should give you the definition you want.

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The possession "horsepower" was coined by the swing James Watt (1736 to 1819) in 1782 while working on doing very well the performance of steam engines. This occur while using a mine pony to lift coal out of a coal mine. He conceived the notion of defining the power exerted by these animals to accomplish this work. He found that, on the average, a mine horse could pull (lift by routine of a pulley) 22,000 foot-pounds per minute. Rather than call this "pony" power, he increased these oral exam results by 50 percent, and called it horsepower i.e. 33,000 foot-pounds of work per minute.

Under this system, after, one horsepower is defined as:

1 hp = 33,000 ft-lbs/min (550 ft-lbs/sec) (745.69987158227022 watts)


The following metrics have be widely used to define "horsepower":

* Mechanical horsepower — 0.74569987158227022 kW/hp (745.7 watts/hp) (33,000 ft-lbs/min) (550 ft-lbs/sec)
* Metric horsepower — 0.73549875 kW/hp (735.5 watts/hp)
* Electrical horsepower — 0.746 kW/hp (746 watts/hp)
* Boiler horsepower — 9.8095 kW/hp (9810 watts/hp)

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