Electric Potential ( Electrostatic Voltage )
It is defined as the work done in an opposite direction to the electric field, to bring a unit positive charge from an infinite position to any point in the electric field is called the static electric potential or electrostatic potential (V) at that particular point.
Suppose P is the point, where work is done by moving a unit positive charge opposite to the electric field, then electric potential is
Unit of electric potential = joule/coulomb = volt (V)
Suppose Q is the point, where work is done by moving a unit positive charge opposite to the electric field, then electric potential is
Now,
Electric Potential is a function of position and is a scalar quantity and the equation above shows the potential difference between the two point P and Q.