Choose the correct option:

The work done by the external force to move a unit charge from one point to another is known as _______.

The work done by the external force to move a unit charge from one point to another is known as the electric potential difference.

The electric potential difference(V) between two points = $\frac{\mathrm{Work} \mathrm{done}}{\mathrm{Charge}}$

$\therefore \mathrm{V}=\frac{\mathrm{W}}{\mathrm{Q}}$

SI unit of potential difference is volt(v).

$1 \mathrm{volt} = \frac{1 \mathrm{joule}}{1 \mathrm{coulomb}}$

Therefore, 'electric potential difference' is the correct answer.