One horsepower is equal to 745.7 watts, watts being a unit of power that James Watt also came up with, and the same unit you see everyday associated with things like light bulbs and electrical devices. One horsepower is equivalent to the amount of force needed to lift 550 lbs of weight within a period of 1 second. Watt would call this new unit of measurement "horsepower". Back in the 18th century James Watt was developing steam engines and wanted to come up with a unit of measurement that would indicate the amount of workhorses the steam engine would replace. Horsepower is a measure of the ability to move a certain amount of weight a certain distance, within a certain amount of time.
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