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Results for electromagnetic induction
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(electromagnetism) The production of an electromotive force either by motion of a conductor through a magnetic field so as to cut across the magnetic flux or by a change in the magnetic flux that threads a conductor. Also known as induction.
The production of an electromotive force either by motion of a conductor through a magnetic field in such a manner as to cut across the magnetic flux or by a change in the magnetic flux that threads a conductor. See also Electromotive force (emf).
If the flux threading a coil is produced by a current in the coil, any change in that current will cause a change in flux, and thus there will be an induced emf while the current is changing. This process is called self-induction. The emf of self-induction is proportional to the rate of change of current.
The process by which an emf is induced in one circuit by a change of current in a neighboring circuit is called mutual induction. Flux produced by a current in a circuit A threads or links circuit B. When there is a change of current in circuit A, there is a change in the flux linking coil B, and an emf is induced in circuit B while the change is taking place. Transformers operate on the principle of mutual induction. See also
The phenomenon of electromagnetic induction has a great many important applications in modern technology. See also Coupled circuits; Generator; Induction heating; Microphone; Motor; Servomechanism.
For more information on electromagnetic induction, visit Britannica.com.
Production of an electric current by changing the magnetic field enclosed by an electrical circuit. The most common use of electromagnetic induction is in the electric generator.
Voltage produced in a coil due to relative motion between the coil and magnetic lines of force.
Electromagnetic induction is the production of voltage across a conductor situated in a changing magnetic field or a conductor moving through a stationary magnetic field.
Faraday found that the electromotive force (EMF) produced around a closed path is proportional to the rate of change of the magnetic flux through any surface bounded by that path.
In practice, this means that an electrical current will be induced in any closed circuit when the magnetic flux through a surface bounded by the conductor changes. This applies whether the field itself changes in strength or the conductor is moved through it.
Electromagnetic induction underlies the operation of generators, induction motors, transformers, and most other electrical machines.
Faraday's law of electromagnetic induction states that:
,where
is the
electromotive force (emf) in voltsFor the common but special case of a coil of wire, composed of N loops with the same area, Faraday's law of electromagnetic induction states that
where
is the
electromotive force (emf) in voltsA corollary of Faraday's Law, together with Ampere's and Ohm's laws is Lenz's law:
The direction mentioned in Lenz's law can be thought of as the result of the minus sign in the above equation.
Two videos demonstrating Faraday's and Lenz's laws can be watched at EduMation
The principles of electromagnetic induction are applied in many devices and systems, including:
Michael Faraday is generally credited with having discovered the induction phenomenon in 1831 though it may have been anticipated by the work of Francesco Zantedeschi in 1829[citation needed]. Around 1830 [1] to 1832 [2] Joseph Henry made a similar discovery, but did not publish his findings until later.
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 | Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Sci-Tech Encyclopedia. McGraw-Hill Encyclopedia of Science and Technology. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved. Read more |
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| Science Dictionary. The New Dictionary of Cultural Literacy, Third Edition Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin. All rights reserved. Read more |
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| Electronics Dictionary. Copyright 2001 by Twysted Pair. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Electromagnetic induction". Read more |
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