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Two of the three electric power expressions are restricted because they can be used only for:
ABatteries
BCapacitors
CInductors
DResistors
Answer & Solution
Correct answer: D. Resistors
1. Generality is what separates the three power formulas.
2. Three expressions for electric power are given for circuit work.
3. The first equation is always valid.
4. The other two can be used only for resistors.
5. Applying them to a non-resistive element would be wrong.
_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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