# A charge of 4 C is passing through points A and B on a circuit. If the charge's electric potential changes from 37 J to 7 J, what is the voltage between points A and B?

Oct 13, 2016

$- \frac{15}{2} V$
The potential energy $U$ is related to potential or voltage $V$ by
$U = V q$
So $\Delta V = \frac{\Delta U}{q} = - \frac{30}{4} = - \frac{15}{2} V$