
Voltage
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VoltageVoltage is electric potential energy per unit charge, measured in joules per coulomb ( = volts). It is often referred to as "electric potential", which then must be distinguished from electric potential energy by noting that the "potential" is a "perunitcharge" quantity. Like mechanical potential energy, the zero of potential can be chosen at any point, so the difference in voltage is the quantity which is physically meaningful. The difference in voltage measured when moving from point A to point B is equal to the work which would have to be done, per unit charge, against the electric field to move the charge from A to B.

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Electromotive Force (EMF)When a voltage is generated by a battery, or by the magnetic force according to Faraday's Law, this generated voltage has been traditionally called an "electromotive force" or emf. The emf represents energy per unit charge (voltage) which has been made available by the generating mechanism and is not a "force". The term emf is retained for historical reasons. It is useful to distinguish voltages which are generated from the voltage changes which occur in a circuit as a result of energy dissipation, e.g., in a resistor.

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Motional EMFThe magnetic force exerted on the charges in a moving conductor will generate a voltage (a motional emf). This motional emf is one of many settings in which the generated emf is described by Faraday's Law.

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Motional EMF and Faraday's LawThe motional emf expression is an application of Faraday's Law, as can be seen from: 
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