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The electrostatic potential is defined as the work done in bringing a single positive charge from infinity to a point in the electric field. Any point outside the electric field or space is called infinite point.
The unit of potential is volt (V).
Electric potential is a physical quantity, the value of which at different points tells us the direction of the electric current. Electric current flows from a higher potential to lower potential. If work is done by the charge, then the potential at that point is negative. If work is done by the charge, then the potential at that point is negative. The amount of work done does not depend on the path chosen.
If the amount of work done in bringing 1 coulomb of charge from infinity to a given point in the electric field is 1 joule, then the potential at that point is said to be 1 volt.
Thus 1 volt= 
Thus if a body is given Q coulomb of charge to raise its potential by V volt then the amount of work done will be VQ joule.
W = VQ
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