Voltage Energy per unit electric charge that is imparted by an energy source, such as an electric generator or a battery (A.K.A. Electromotive Force (EMF), electrical potential). In the metreÐkilogramÐsecond (MKS) system of units, electric potential is expressed in units of joules per coulomb of electric charge (i.e., volts). See the Encyclopædia Britannica entry here.

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