Question

definition for electromotive force? ​

Answer 1

☆ ELECTROMOTIVE FORCE :-

A difference in potential that tends to give rise to an electric current.

Answer 2

Electromotive force :

• The influence that makes the current flow from lower to higher potential is called electromotive force (emf).
• Despite its name, electromotive force is not a force but an energy -per -unit- charge quantity like potential.
• The emf is equal to the work done on the charge per unit charge (ϵ=dWdq) when no current is flowing.
• It is measured in volts and denoted by ϵ.
• The SI unit of emf is same as that for potential, the volt. (1 V = 1 J / C)

or The electromotive force (emf) is the potential difference of a source when no current is flowing.

Source of emf :

Every complete circuit with a steady current must include some devices which provide emf. Such a device is called the source of emf. Batteries, electric generators, solar cells, thermocouples and fuel cells are the example of of the sources of emf.