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Encyclopedia > Electret

Electret (formed of elektr- from "electricity" and -et from "magnet") is material that has been permanently electrically charged (polarised). The magnetic equivalent is a permanent magnet. Oliver Heaviside coined this term.. The article on electrical energy is located elsewhere. ... Magnetic lines of force of a bar magnet shown by iron filings on paper A magnet is an object that has a magnetic field. ... Electric charge is a fundamental FATTY STASHEconserved property of some subatomic particles, which determines their electromagnetic interactions. ... This article treats polarization in electrodynamics. ... Magnetic lines of force of a bar magnet shown by iron filings on paper A magnet is an object that has a magnetic field. ... Oliver Heaviside (May 18, 1850 – February 3, 1925) was a self-taught British engineer, mathematician and physicist. ...


Polarised material consists of atoms or molecules with electric dipole moment. It can be produced by cooling down material composed of long molecule chains with electric dipole moment so that so-called domains are formed. Properties For alternative meanings see atom (disambiguation). ... In science, a molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. ... This article is about the electromagnetic phenomenon. ... This article is about the electromagnetic phenomenon. ...


Electret materials have recently found commercial and technical interest. For example, they are used in one form of microphone. A microphone with a cord A microphone, sometimes called a mic (pronounced mike), is a device that converts sound into an electrical signal. ...


Further reading

  • Jefimenko, Oleg D., and David K. Walker (illus.), "Electrostatic motors; their history, types, and principles of operation". Star City [W. Va.], Electret Scientific Co. [1973]. LCCN 73180890
  • Adams, Charles K., "Nature's Electricity". Tab Books, Inc., Pa. (USA). ISBN 0830627693
  • Gross, Bernhard, "Charge storage in solid dielectrics; a bibliographical review on the electret and related effects". New York, Elsevier Pub. Co., 1964. (Supported by the United States Air Force through the Air Force Office of Scientific Research of the Air Research and Development Command, under grants number AF 60-6 and 61-140.)

See also

Oliver Heaviside (May 18, 1850 – February 3, 1925) was a self-taught British engineer, mathematician and physicist. ... A telephone handset A touch-tone telephone dial Telephone This article is about telephone technology. ... A microphone with a cord A microphone, sometimes called a mic (pronounced mike), is a device that converts sound into an electrical signal. ... An electromotive force (emf) is the force, measured in volts, that is produced by interaction between a current and a magnetic field, at least one of which is changing. ... Tip Ring Sleeve (TRS) connectors are three-conductor jack plugs and the corresponding sockets, used in many stereophonic and other audio applications. ...

  Results from FactBites:
 
Electret - definition of Electret in Encyclopedia (100 words)
Electret (formed of elektr- from "electricity" and -et from "magnet") is material that has been permanently electrically charged (polarised).
Electret materials have recently found commercial and technical interest.
For example, they are used in one form of microphone.
Encyclopedia: Electret (434 words)
The article on electrical energy is located elsewhere.
Star City [W. Va.], Electret Scientific Co. [1973].
Gross, Bernhard, "Charge storage in solid dielectrics; a bibliographical review on the electret and related effects".
  More results at FactBites »

 
 

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