Electric potential (V) at a point is defined as the amount of work done in bringing a unit positive charge from infinity to that point. Unit of potential is 1V=1JC−1. V=QW Note: Potential is taken to be zero at infinity and at ground.
Unit of potential difference
The S.I Unit of potential difference is volt (V). 1 volt =One volt is the potential difference between two points in a current carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to the other. 1Volt=1Coulomb1Joule The potential difference is measured by an instrument called voltmeter.