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Operation of a modern telephone handset

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In a modern telephone handset, the microphone uses a piezo-electric crystal and the earpiece is a miniature loud speaker using a moving coil and a permanent magnet. Explain how the microphone creates a current in a pair of wires and how the current delivered to the handset creates sounds from the earpiece.

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A microphone is a transducer that uses sound waves as input and convert them to electrical signals as output. A piezoelectric microphone contains a ceramic or quartz crystal. That crystal is exposed to the sound pressure, and the applied sound pressure to the crystal causes it to vibrate. The crystal ...

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