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Electromagnetic induction was discovered by Michael Faraday, published in 1831. [3] [4] It was discovered independently by Joseph Henry in 1832. [5] [6] In Faraday's first experimental demonstration (August 29, 1831), he wrapped two wires around opposite sides of an iron ring or "torus" (an arrangement similar to a modern toroidal transformer).
Faraday's notebook on August 29, 1831 [8] describes an experimental demonstration of electromagnetic induction (see figure) [9] that wraps two wires around opposite sides of an iron ring (like a modern toroidal transformer).
Electromagnetic induction was first described by Michael Faraday in 1831. [8] [9] In Faraday's experiment, he wrapped two wires around opposite sides of an iron ring. He expected that, when current started to flow in one wire, a sort of wave would travel through the ring and cause some electrical effect on the opposite side.
A diagram of Faraday's iron ring-coil apparatus Built in 1831, the Faraday disc was the first electric generator. The horseshoe-shaped magnet (A) created a magnetic field through the disc (D). When the disc was turned, this induced an electric current radially outward from the centre toward the rim.
Eddy currents in conductors of non-zero resistivity generate heat as well as electromagnetic forces. The heat can be used for induction heating. The electromagnetic forces can be used for levitation, creating movement, or to give a strong braking effect. Eddy currents can also have undesirable effects, for instance power loss in transformers.
Using his newly developed electromagnetic principle, in 1831, Henry created one of the first machines to use electromagnetism for motion. This was the earliest ancestor of modern DC motor . It did not make use of rotating motion, but was merely an electromagnet perched on a pole, rocking back and forth.
A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, loudspeakers, magnetic recording heads, and magnetic assemblies.
Discovery of electromagnetic induction (1831): Michael Faraday discovers magnetic induction in an experiment with a closed ring of soft iron, with two windings of wire. Joule's experiment (1834):James Prescott Joule demonstrates the mechanical equivalent of heat, an important step in the development of thermodynamics.