- Eleectric potential difference or voltage (V) is the change in electric potential energy per unit charge/ per coulumb between any two points.
- The potential difference (voltage) between the terminals of a power supply is the number of joules of electric potential energy GIVEN to each coulomb of electric charge.
The potential difference between the ends of a resistor
is the number of joules of electric potential energy DISSIPATED
for each coulomb of electric charge that passes through the resistor.