Home › AP Physics 2 › Physics › Electric Current, Resistance, and Ohm's Law › Of the three expressions given for electric powe…
Of the three expressions given for electric power, how many are valid for any circuit element?
AOnly the last one
BNone of the three
COnly the first one
DAll three of them
Answer & Solution
Correct answer: C. Only the first one
1. The power expressions differ in how general they are.
2. Three expressions for electric power are given.
3. The first equation is always valid.
4. The other two can be used only for resistors.
_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_
Related questions
Two wires of identical shape but different metals carry different currents at the same volA battery supplies a constant voltage, which makes the circuit it drives:Electric energy and electric power are connected by treating power as a rate of:A current of 3 amperes means charge passes a point at a rate of:Two of the three electric power expressions are restricted because they can be used only fFuses and circuit breakers are rated in which unit?Lightbulbs are commonly rated in which unit?Because the SI unit for potential energy is the joule, power has units of: