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Physics - Voltage

Let us define voltage. The electric potential is defined as the electric potential energy unit per charge, and the change in electric potential energy produces a potential difference or voltage. Therefore, the voltage between two objects is the difference in electric potential between those two objects. 

To make an electric current flow and keep it flowing, you need a mechanism for creating and maintaining a potential difference or voltage. The potential difference created by such a mechanism is called an electromotive force (EMF), often written as E, and its units are volts, which are units of potential difference.