- the energy available for conversion from nonelectric to electric form, or vice versa, per unit of charge passing through the source of the energy; the potential difference between the terminals of a source of electrical energy: expressed in volts. Abbreviations: emf, EMF, E.M.F., e.m.f.
- physics
- a source of energy that can cause a current to flow in an electrical circuit or device
- the rate at which energy is drawn from this source when unit current flows through the circuit or device, measured in volts
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