What is electromotive force?

What is electromotive force?


1 Answers

askIITIians Expert
21 Points
13 years ago

Electromotive force


An external energy source is required by most electrical circuits to move charge through the circuit. The circuit therefore must include a device that maintains a potential difference between two points in the circuit, just as a circulating fluid requires an analogous device that maintains a pressure difference between two points.


Any device that performs this task in an electrical circuit is called a source of electromotive force. It is sometimes useful to consider a source of emf as a mechanism that creates a “hill” of potential and moves charge “uphill” from which the charge flows “downhill” through the rest of the circuit. A common source of emf is the ordinary battery; another is the electric generator found in power plants. Solar cells are sources of emf used both in found sources of emf are fuel cells and thermopiles.

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