A horse's horsepower depends on how you measure it:
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Peak output: In short bursts, a horse can reach around 15 horsepower!
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Sustainable output: Over a longer period, like a workday, a horse averages closer to 1 horsepower. This is the amount of power James Watt had in mind when he defined the unit.
So, the term "horsepower" is a bit of a trick! It refers to a unit of power established based on what a horse could do for a sustained period, not necessarily the maximum output of the animal itself.