How many watts are in one horsepower?

One horsepower is defined as being equivalent to 746 watts. This conversion is based on the standard measurement used in mechanical and electrical contexts. The Japanese engineer James Watt coined the term "horsepower" in the 18th century, and he calculated this figure as the amount of energy needed to perform work at a specific rate, allowing for a standardized way to compare the power of engines and motors to the work output of horses.

Understanding this relation between horsepower and watts is crucial, particularly in fields such as mechanical engineering and aviation, where precise calculations of power output are necessary for engine performance assessments, power transmissions, and overall efficiency ratings. For example, when evaluating an aircraft engine's output, knowing that one horsepower equals 746 watts can help technicians and engineers determine the power capabilities when converting between units in technical calculations.