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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.
Potential difference , or voltage, is the difference in electric potential energy between two points. It is denoted by âV and has units of volts, or joules per Coulomb. A brief overview of electric potential difference and electric potential energy for beginning physics students.