The Telephone System

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plastic held above a thicker, hollow metal disk. This plastic disk
is electrically charged, and creates an electric field. The sound waves from
the caller's voice cause the plastic disk to vibrate, changing the distance
between the disks, thus changing the intensity of the electric field. These
variations are translated into an electric current which travels across the
telephone lines. The receiver of a telephone is composed of a flat ring of
magnetic material. Underneath this magnetic ring is a coil of wire where the
electric current flows. Here, the current and magnetic field from the magnet
cause a diaphragm between the two to vibrate, and replicate the sounds that are
transformed into electricity.
The telephone is also composed of an alerter and a dial. The alerter,
usually known as the ringer, alerts a person of a telephone call, created by a
special frequency of electricity sent by the telephone number typed in. The
dial is the region on the phone where ...

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