Tuesday

This Blog Deals With Electronic Induction


Electromagnetic induction


Electromagnetism
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Electricity · Magnetism
[hide]Electrodynamics
Lorentz force law · emf ·Electromagnetic induction ·Faraday’s law · Lenz's law ·Displacement current ·Maxwell's equations · EM field ·Electromagnetic radiation ·Liénard–Wiechert potential ·Maxwell tensor · Eddy current
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Electromagnetic induction is the production of voltage across a conductor moving through a magnetic field. It underlies the operation of generators, all electric motors, transformers,induction motors, synchronous motors, solenoids, and most other electrical machines.
Michael Faraday is generally credited with the discovery of 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 Henrymade a similar discovery, but did not publish his findings until later.


Overview

Michael Faraday stated that electromotive force (EMF) produced around a closed path is proportional to the rate of change of the magnetic flux through anysurface bounded by that path. In practice, this means that an electric current will be induced in any closedcircuit 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.
In mathematical form, Faraday's law states that:
\mathcal{E} = -{{d\Phi_B} \over dt},
where
\scriptstyle {\mathcal{E}} is the electromotive force
ΦB is the magnetic flux
For the special case of a coil of wire, composed of N loops with the same area, the equation becomes
\mathcal{E} = - N{{d\Phi_B} \over dt}
A corollary of Faraday's Law, together with Ampère's law and Ohm's law is Lenz's law:
The EMF induced in an electric circuit always acts in such a direction that the current it drives around the circuit opposes the change in magnetic flux which produces the EMF.[citation needed]

[edit]Applications

The principles of electromagnetic induction are applied in many devices and systems, including:
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