A charge of #4 C# is passing through points A and B on a circuit. If the charge's electric potential changes from #22 J# to #15 J#, what is the voltage between points A and B?
Voltage can be defined as the amount of energy lost or gained by a unit charge as it moves across a circuit from one point to another.
The charge we are considering in this case is
The amount of energy lost is
Thus the voltage is