# A charge of 4 C is passing through points A and B on a circuit. If the charge's electric potential changes from 45 J to 18 J, what is the voltage between points A and B?

Apr 26, 2016

We have $V = q E$ or, better, $\Delta V = q \Delta E$.
So $\Delta V = 4 \cdot \left(18 - 45\right) = - 108$ $V$
The voltage difference between the points is $108$ $V$