### All AP Physics C Electricity Resources

## Example Questions

### Example Question #1 : Using Ohm's Law

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:**

Explanation:

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 #3 : Circuit Relationships

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

**Possible Answers:**

**Correct answer:**

Explanation:

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 R_{2} and R_{3} are in parallel with one another. Once combined, their requivalent resistor (R_{23}) is in series with R_{1}.

The equivalent resistance is thus given by:

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