Wikipedia (Beta): Piezoelectricity

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Piezoelectricity is the ability of some materials (notably crystals and certain ceramics, including bone) to generate an electric field or electric potential in response to applied mechanical stress.
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    Piezoelectric Loudspeakers
    This kind of loudspeaker makes the most of the proprieties of certain materials to vibrate when they are traversed by an electric current. The vibration-frequency is correlated to the frequency of the applied current and in this way the sound transported by the electric signal is reproduced.
    Piezoelectric microphones
    This kind of microphone makes the most of the characteristic of certain elements of ceramics, in that they are able to develop an electric field if put through compression. When the sound wave reaches the material, the latter compresses it and expands it according to its frequency-content.

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