AP Physics C: Mechanics : Calculating Circuit Power

Study concepts, example questions & explanations for AP Physics C: Mechanics

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Example Questions

Example Question #1 : Circuit Relationships

A simple circuit contains two  resistors in parallel, connected to a 20V source. What power is being provided by the source to the circuit?  

Possible Answers:

Correct answer:


The power supplied to the circuit can be calculated using the equation:

To use this equation, we need to find the equivalent resistance of the circuit. Use the equation for equivalent resistance in parallel:

Now that we have the resistance and the voltage, we can solve for the power.

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