Electrons are charged particles_ The amount of charge that passes per unit time is called The driving force for the electrons (i.e _ the reason they are flowing in the first place) is measured by potential. voltage. current: charge: potential: current: Charge is measured in Current is measured in joules (J) volts (V) amperes (A) volts (V) coulombs (C) coulombs (C): amperes (A) joules (J) Potential is measured in amperes (A) joules (J) coulombs (C) volts (V)