# A charge of 4 C is passing through points A and B on a circuit. If the charge's electric potential changes from 17 J to 1 J, what is the voltage between points A and B?

Jan 26, 2016

$4 \text{V}$

#### Explanation:

If 1 coulomb of charge is moved through a potential difference of 1 volt then 1 joule of work is done.

$\therefore$ 4C moved through E volts requires 17 - 1 = 16 J.

This means the potential difference must be 4 V.

Or:

$E = \frac{W}{Q} = \frac{16}{4} = 4 \text{V}$