electret
Noun
Meaning
English Wikipedia has an article on:electretWikipedia
electret (plural electrets)
(physics) A solid dielectric having a quasi-permanent charge; usually a metallized film; used in electroacoustic and electromechanical transducers and in air filters.
Synonyms
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Examples
Electret microphones and condenser microphones employ electrostatics—as the sound wave strikes the microphone's diaphragm, it moves and induces a voltage change.