Electro Motive Force - EMF

Electro Motive force, well known as emf, is the maximum potential difference between two electrodes of a battery or galvanic cell. By fact, electrical energy is not available directly from the nature. Emf converts chemical, mechanical, and other forms of energy into electrical energy.

Induced EMF

Whenever a conductor is placed in a varying magnetic field, emf is induced in the conductor, which causes the current to flow through the conductor. This emf is called induced emf.

Statically induced EMF

When the conductor is in stationary and the magnetic field is varying then an emf is induced in the condutor. This type of emf is called statically induced emf. In transformer the emf is induced statically

Dynamically induced EMF

When the magnetic field is stationary and the conductor is varying i.e) cutting the flux line produced by the magnetic field then the emf is induced in the conductor. This type of emf is called dynamically induced emf. DC generator works under the principle of dynamically induced emf.

Self induced EMF

The EMF induced in a coil due to change in flux linkage when a changing current flows through the coil. This type of emf is called self induced emf. DC generator works under the principle of self induced emf.

Mutually induced EMF

When a secondary winding or a coil is brought near a primary winding or a coil which producing changing flux, then EMF will be induced in the second coil due to change in current in the first coil. This type of emf is called Mutually induced emf Transformer works under the principle of mutually induced emf.