AP Physics C Electricity : Using Ohm's Law

Study concepts, example questions & explanations for AP Physics C Electricity

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Example Questions

Example Question #1 : Circuit Relationships

A simple circuit consists of a  resistor that's connected to a  battery. How much power is dissipated by the resistor?

Possible Answers:

Correct answer:


One of the formulas for power is . We are given the values of the voltage and resistance.

Using these values, we can solve for power.

Example Question #1 : Using Ohm's Law


What is the current delivered to the curcuit by the battery?

Possible Answers:

Correct answer:


Using Ohm's law to solve for the value of the current from the battery requires calculation of the equivalent resistance of the circuit.

The resistors R2 and R3 are in parallel with one another. Once combined, their requivalent resistor (R23) is in series with R1.


 The equivalent resistance is thus given by:

Use this value and the given voltage to solve for the current in the circuit:


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