Question

Define EMF. Complete explanation please.

Answer 1

Electromotive force, abbreviated emf, is the electrical action produced by a non-electrical source. A device that converts other forms of energy into electrical energy, such as a battery or generator, provides an emf as its output. Sometimes an analogy to water "pressure" is used to describe electromotive force

Answer 2

Hey Friend

Here is your Answer,

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▶ EMF Mean Electro Motive Force.

▶ An electrical voltage difference is sometimes called an emf.

▶ Devices that can provide emf include electrochemical cells, thermoelectric devices, solar cells, photodiodes, electrical generators, transformers and even Van de Graaff generators.

▶ In nature, emf is generated whenever magnetic field fluctuations occur through a surface.The shifting of the Earth's magnetic field during a geomagnetic storm induces currents in the electrical grid as the lines of the magnetic field are shifted about and cut across the conductors.

▶ A source of emf can be thought of as a kind of charge pump that acts to move positive charge from a point of low potential through its interior to a point of high potential. … By chemical, mechanical or other means, the source of emf performs work dW on that charge to move it to the high potential terminal. The emf ℰ of the source is defined as the work dW done per charge dq:

ℰ = dW/dq

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Hope it helps you.