define EMF of cell and also write its SI unit
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The amount of external work done to transfer a unit positive charge from the lower to the higher potential inside an electric source, is called the electromotive force or emf of the source. ... so, the unit of emf is volt which is also the unit of electric potential and potential difference.
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Electromotive force or e.m.f is defined as the battery's energy per Coulomb of charge passing through it. like other measures of energy per charge emf has SI unit of volts, equivalent to joules per coulomb.
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