The differences in electric potential or voltage (we use both terms interchangeably) can be used to determine changes in the electric potential energy of a charged object. IfI have a particle with a charge q that is moving between two points in space which have a difference in electric potential (or voltage) of AV, the change in electric potential energy of that object is given by AEPE = q AV. When answering the following questions remember that a gain in electric potential energy is given by AEPE > 0 and a loss of electric potential energy is given by AEPE