Potential difference is the difference in electric potential between two points in an electric circuit. It is also sometimes referred to as voltage.

Here's a breakdown:

* Potential refers to the amount of energy a charge would have if it were moved to a specific point in the electric field.

* Difference implies that we are comparing the potential at two different points.

Therefore, potential difference (pd) measures the amount of energy that is transferred when a unit of charge moves between two points in an electric circuit.