Practice!

Sample Problem

How much energy is needed to move one electron through a potential difference

of 1.0 x 102 volts? Remember that the charge of an electron, e, is 1.6 x 10-19 C.

Solution

We will use the equation ΔV = (ΔUE) /q. We plug in all of the given values and

we get 1.0 × 102 = (ΔUE) / (1.6 × 10-19) , ΔUE = 1.6 × 10-17 J