The electric potential at a point in an electric field is the work done per unit charge on a positive test charge when it is moved from infinity to that point. By definition, the electric potential energy is zero at infinity.Electric potential V is a scalar quantityThe unit of electric potential is the volt(V). 1 V = 1 JC-1ExampleIf a +1μC test charge is moved from infinity to a point where the electric potential is +1000V, the electric potential energy is EP=QV= 1×10-6×1000. This means that 1×10-3J of work is done on the charge to move it to that point.If the point charge was negative, work is done by the charge to move it from infinity to -1000V