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Because the SI unit for potential energy is the joule, power has units of:
AJoules per metre
BJoules per coulomb
CJoules per kelvin
DJoules per second
Answer & Solution
Correct answer: D. Joules per second
1. Power is an energy rate, so its units follow from energy and time.
2. The SI unit for potential energy is the joule.
3. Power therefore has units of joules per second.
4. Joules per second are called watts.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 20 'Electric Current, Resistance, and Ohm's Law', sections 20.1-20.7_
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