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Noun. 1. potential difference-the difference in electrical charge between two points in a circuit expressed in volts. electric potential, potential drop, voltage, potential. electrical phenomenon-a physical phenomenon involving electricity.
Electric potential energy results from forces between charges; potential difference is the energy needed to move a charge from point A to B. Calculate the potential energy between the charges. Electric potential energy is a type of potential energy that results from Coulomb forces. The potential energy (UE) between charges q and Q can be calculated as a function of distance between the charges (r): $U_E(r)=\frac {qQ}{4 \pi \epsilon_0 r}$.