It’s almost impossible to see a car advertisement or read a SlashGear automotive review without hearing about how many horsepower an engine has. This measurement has been around since the 18th century, when inventor James Watt adapted the term from its existing use to measure the power of waterwheels. At the time, the term was sometimes used to measure the power generated by waterwheels, which were driven by moving water from a stream or waterfall. Watt popularized the term in
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