This post will show what is the meaning of Electromotive Force (EMF) and how it works in electronics. EMF is the short form of electromotive force. All the metals contain a large number of free electrons, which move randomly in all the directions, inside the metal piece, if no external source is connected.
If a battery or voltage source is connected across a metal piece as shown in the above image then the free electrons will move in the directions of the positive end of the external DC source. This happens due to the electric force or pressure by the external battery.
The electric force or pressure that causes the electrons to move in a particular direction is called as the “Electromotive Force” OR EMF.
The unit for e.m.f. is Volts and e.m.f. is also called as voltage or potential difference. It is denoted by V Or sometimes by E.