Ans. POTENTIAL DIFFERENCE
The potential difference between two points is the energy supplied by a unit charge as its moves form one point to the other.
Unit: The SI unit of potential difference is volt (V), which is equal to joule per coulomb (JC~1).Volt
If one joule of work is done against electric field in bringing one coulomb positive charge from infinity to a point in the electric field then the potential at the point vjii be one volt.