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The measurement of the electrical potential difference between the positive and negative terminals of a battery is known as
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The idea behind both parameters is the same.

Electric Potential is a property that belongs not to some charged particle, but to a geometric point, whether in some space with an Electric Field, or on an electric Circuit.

It tells you the potential energy that would be possessed by a charge of +1 Coulomb if it were to occupy either of these points as compared to a point that has zero Electric Potential. It is measured in Volts.

1 Coulomb is a huge value of charge, and is used only because it represents a Unit Charge in the SI system.

In the case of a circuit, the most convenient point with zero Electrical Potential is a well-engineered ground or earth. Let us say our circuit uses an AA cell of rated EMF 1.5 volts. Connect the negative terminal to the earth. the positive terminal will have the same amount of potential energy that will be possessed by 6.256.25 x 10181018 electrons dragged 1.5 Joules above earth potential.

In the case of an Electric Field, we have to make do with dragging these electrons from a fictitious point situated a infinity distance from our point.
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