Electromagnetic induction is the generation of an electromotive force in a closed electrical circuit. It results from a changing magnetic field as it passes through the circuit. Some of the most basic components of electrical power systems—such as generators and transformers—make use of electromagnetic induction.
The phenomenon of electromagnetic induction was discovered by the British physicist Michael Faraday in 1831 and independently observed soon thereafter by the American physicist Joseph Henry. Prior to that time, it was known that the presence of an electric charge would cause other charges on nearby conductors to redistribute themselves. Furthermore, in 1820 the Danish physicist Hans Christian Oers…
An electrical generator is an apparatus that converts mechanical energy into electrical energy. In this case the magnetic field is stationary and does not vary with time. It is the circuit that is made to rotate through the magnetic field. Since the area that admits the passage of magnetic field lines changes while the circuit rotates, the flux through the circuit will change, thus inducing a curr…
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