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Difference between watt and horse-power

Updated: 9/27/2023
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10y ago

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The watt is the SI (metric) unit of measurement for power, whereas the horsepower is the Imperial unit for power. Either unit can be used to measure power, although the horsepower is considered archaic in most countries outside North America. For example, most European car manufacturers now rate their engines in kilowatts rather than in horsepower.

Further Note:The horsepower is still common in the UK, for internal-combustion engines and electric motors. It equals 33000ft-lbs/hour, or 746W. When the 4W per HP error is insignificant, approximating 1 HP to 750W simplifies converting the units.

I have seen a peculiar unit quoted in car reviews in the British press, the "kp" (kilopoule) - literally "1000 hens". It's not a standard unit of power in any real system, and I have not seen any conversion for it, but it may emanate from the French car makers.

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Q: Difference between watt and horse-power
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