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The potential difference at a  point is defined as the amount of work done in bringing a unit of positive charge from infinity to that point .
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Potential Difference is the difference in electric potential energy per coulomb of charge at one point of a circuit compared to the charge at another point in a circuit. 

Potential difference, or voltage, is a way of describing the energy of an electric field without using test charges. In circuits, potential difference is the difference in voltage from one part of a circuit to another. It can also be described by ohms law where the Voltage=Current*Resistance.

In electrostatics, potential difference is the line integral of the electric field from one point to another with respect to distance. 

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