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Electric potential at a point is defined as the energy per unit test charge required for it to be brought from infinity to its location.  

Potential depends on the physical location, and the distance of the location from the charge causing electric field.

Difference in Electric potential is the main reason for electric current to flow in a circuit.  Difference in potential causes electric force and field at a point in space.

Its units are Volts or  Joules/ Coulomb.

IF the electric potential is same at two points in a circuit or in space, then there is no current between them.  Current flows from higher potential towards lower potential in a circuit.  The electric potential between the two terminals of a cell or battery is called EMF or electromotive force.

Space Gradient of potential is equal to the electric field.

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