# AP Physics C Electricity : Calculating Current

## Example Questions

### Example Question #1 : Current

A lamp has a  bulb. If the house wiring provides  to light up that bulb, how much current does the bulb draw?

Explanation:

The formula for power is ,and we are given the following values.

Solve for the current, .

### Example Question #1 : Current

A particle accelerator with a radius of 500 meters can have up to  protons circulating within it at once.

How fast must the protons in the accelerator move in order to produce a current of 1A?