Electromagnetic Induction.

Electromagnetic Induction is the production of electromotive force or emf across an electric conductor in a changing magnetic field. Electromagnetic induction first discovered by Michael Faraday in 1831 has found many applications today. These include electrical components such as inductors and transformers and electrical devices such as electric motors and generators.


ELECTRIC GENERATORS : The emf generated by Faraday’s law of induction due to relative movement of a circuit and magnetic field is the principle behind the operations of electrical generators. When a permanent magnet is moved relative to a conductor or vice versa, an electromotive force is created. If the wire is connected through an electric load, current will flow and thus electrical energy is generated converting the mechanical energy of motion to electrical energy.


When a loop of wire in an electric current changes, the changing current creates a changing magnetic field. A second wire in reach of this magnetic field will experience this change in magnetic no field as a change in its coupled magnetic flux. Therefore an electromotive force is set up in the second loop called the induced emf or transformer emf. If the two ends of this loop are connected to an electric load, current will flow.


Faraday’s law is used to measure the flow of electrically conductive liquids and slurries. Such instruments are called magnetic flow meters.

principle of electromagnetic induction

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