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Electromagnetic induction is the production of voltage across a Conductor (material) situated in a changing magnetic field or a conductor moving through a stationary magnetic field.

Technical Details Faraday found that the electromotive force (EMF) produced around a closed path is Proportionality (mathematics) 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 electrical generators, induction motors, transformers, and most other electrical machines.

Faraday's law of induction of electromagnetic induction states that: \mathcal{E} = -{{d\Phi_B} \over dt} ,

where \mathcal{E} is the electromotive force (emf) in volts ΦB is the magnetic flux in Weber (Wb)s

For the common but special case of a coil of wire, composed of N loops with the same area, Faraday's law of induction of electromagnetic induction states that \mathcal{E} = - N{{d\Phi_B} \over dt}

where \mathcal{E} is the electromotive force (emf) in volts N is the number of turns of wire (per metre) ΦB is the magnetic flux in Weber (Wb)s through a single loop.

A corollary of Faraday's Law, together with Ampere's and Ohm's laws isLenz'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.

The direction mentioned in Lenz's law can be thought of as the result of the minus sign in the above equation.

Practical Demonstration Two videos demonstrating Faraday's and Lenz's laws can be watched at EduMation

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



Discovery 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. Around 1830 to 1832 Joseph Henry made a similar discovery, but did not publish his findings until later.

See also

External links

References Electromagnetic induction is the production of voltage across a Conductor (material) situated in a changing magnetic field or a conductor moving through a stationary magnetic field.

Technical Details Faraday found that the electromotive force (EMF) produced around a closed path is Proportionality (mathematics) 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 electrical generators, induction motors, transformers, and most other electrical machines.

Faraday's law of induction of electromagnetic induction states that: \mathcal{E} = -{{d\Phi_B} \over dt} ,

where \mathcal{E} is the electromotive force (emf) in volts ΦB is the magnetic flux in Weber (Wb)s

For the common but special case of a coil of wire, composed of N loops with the same area, Faraday's law of induction of electromagnetic induction states that \mathcal{E} = - N{{d\Phi_B} \over dt}

where \mathcal{E} is the electromotive force (emf) in volts N is the number of turns of wire (per metre) ΦB is the magnetic flux in Weber (Wb)s through a single loop.

A corollary of Faraday's Law, together with Ampere's and Ohm's laws isLenz'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.

The direction mentioned in Lenz's law can be thought of as the result of the minus sign in the above equation.

Practical Demonstration Two videos demonstrating Faraday's and Lenz's laws can be watched at EduMation

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



Discovery 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. Around 1830 to 1832 Joseph Henry made a similar discovery, but did not publish his findings until later.

See also

External links

References

Electromagnetic Induction
Science Enhancement Programme (SEP): developing innovative curriculum resources for schools and providing professional development opportunities for science teachers in the UK.

Lectures 13 and 14 Electromagnetic induction
Lectures 13 and 14 Electromagnetic induction. Introduction. In the previous lectures we saw that when a current passes through a wire then a magnetic field is produced.

Faraday's law of induction - Wikipedia, the free encyclopedia
Faraday's law of induction describes an important basic law of electromagnetism, which is involved in the working of transformers, inductors, and many forms of electrical ...

BBC - GCSE Bitesize - Physics | Electricity and magnetism ...
Electromagnetic induction: An electric current is induced when a magnet moves into a coil of wire ...

BBC - GCSE Bitesize - Physics | Electricity and magnetism
Electromagnetic induction

Electromagnetic Induction
A virtual experiment on creating electric current with a changing magnetic field.

Motional EMF
Electromagnetic Induction . When the button "start" is pressed, the rod will move to and fro to ...

Electromagnetic Induction
P rices : Biology (450 slides) : £199, Chemistry (280 slides) : £149, Physics (370 slides) : £179, All 3 CD-ROMS : £449 Order form

electromagnetic induction and inertia
Derivation and proof of the inertial properties of electrostatic and magnetostatic fields.

electromagnetic induction - Hutchinson encyclopedia article about ...
In electronics, the production of an electromotive force (emf) in a circuit by a change of magnetic flux through the circuit or by relative motion of the circuit and the magnetic ...

 

Electromagnetic Induction



 
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