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Power output of devices such as electric motors is sometimes expressed in horsepower instead of watts. How many watts equal one horsepower?
A100 W
B1000 W
C746 W
D550 W
Answer & Solution
Correct answer: C. 746 W
1. Horsepower is an older, non-SI unit of power still used for devices like motors.
2. The conversion factor given is 1 hp = 746 W.
3. 100 W and 1000 W are round numbers that do not match this specific conversion factor.
4. 550 W is not the conversion given, so 746 W remains the correct value for one horsepower.
_Source: OpenStax College Physics (CC BY 4.0), Ch 7 "Work, Energy, and Energy Resources", section 7.7 Power_
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