Quotation from: General ScienceWritten by: Bertha M. Clark |
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The rate at which a machine is able to accomplish a unit of work is called _power_, and the unit of power customarily used is the horse power. Any power which can do 550 foot pounds of work per second is said to be one horse power (H.P.). This unit was chosen by James Watt, the inventor of a steam engine, when he was in need of a unit with which to compare the new source of power, the engine, with his old source of power, the horse. Although called a horse power it is greater than the power of an average horse.
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