When you are talking about charges it implies electric potential.

 

Following concepts may improve your understanding regarding the same.

 

 

The general expression for the electric potential as a result of a point charge Q can be obtained by referencing to a zero of potential at infinity. The expression for the potential difference is:

Taking the limit as gives simply for any arbitrary value of r. The choice of potential equal to zero at infinity is an arbitrary one, but is logical in this case because the electric field and force approach zero there. The electric potential energy for a charge q at r is then where k is Coulomb's constant.

 

 

 

Voltage is electric potential energy per unit charge, measured in joules per coulomb ( = volts). It is often referred to as "electric potential", which then must be distinguished from electric potential energy by noting that the "potential" is a "per-unit-charge" quantity. Like mechanical potential energy, the zero of potential can be chosen at any point, so the difference in voltage is the quantity which is physically meaningful. The difference in voltage measured when moving from point A to point B is equal to the work which would have to be done, per unit charge, against the electric field to move the charge from A to B.

 

Used to calculate current in Ohm's law.	Used to express conservation of energy around a circuit in the voltage law.	Used to calculate the potential from a distribution of charges.	Is generated by moving a wire in a magnetic field.

 

 

 

The case of a constant electric field, as between charged parallel plate conductors, is a good example of the relationship between work and voltage.

The electric field is by definition the force per unit charge, so that multiplying the field times the plate separation gives the work per unit charge, which is by definition the change in voltage.

This association is the reminder of many often-used relationships: