What is the difference in electrical potential energy between two points in a circuit called?

The difference in electrical potential energy between two points in a circuit is referred to as voltage. Voltage is a measure of the potential energy per unit charge that exists due to the electric field between two points. It indicates how much work is required to move a unit charge from one point to another within an electric field.

In practical terms, voltage represents the force that drives electric current through a circuit. It is an essential concept in understanding how electrical systems operate, as it influences how much current will flow when combined with resistance, according to Ohm's Law (V = I × R, where V is voltage, I is current, and R is resistance).

The other options pertain to different electrical parameters: current is the flow of electric charge, resistance is the opposition to that flow, and power is the rate at which electrical energy is transferred or converted. Each of these relates to voltage in various ways, but voltage specifically denotes the potential difference that enables current to flow in a circuit.