A charge of #4 C# is passing through points A and B on a circuit. If the charge's electric potential changes from #32 J# to #9 J#, what is the voltage between points A and B?
A volt is defined as a joule per coulomb,
A volt is a unit of electric potential. A joule is a measure of electric potential energy. A volt is defined as a joule per coulomb: if 1 coulomb
In this case
(Note: The question is phrased imprecisely, since 'electric potential' should be measured in volt and 'electric potential' energy in joule)