Electromotive force, abbreviated emf (denoted {\displaystyle {\mathcal {E}}} {\mathcal {E}} and measured in volts),[1] is the electrical action produced by a non-electrical source.[2] A device that converts other forms of energy into electrical energy (a "transducer"),[3] such as a battery (converting chemical energy) or generator (converting mechanical energy),[2] provides an emf as its output.[3] Sometimes an analogy to water "pressure" is used to describe electromotive force.[4] (The word "force" in this case is not used to mean force of interaction between bodies, as may be measured in pounds or newtons.)

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by AAYUSH LAL ROY

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