The telephone system
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The word "telephone" originated from a combination of two Greek words: "tele", meaning far off, and "phone", meaning voice or sound, and became the known term for "far- speaking." A basic telephone usually contains a transmitter, that transfers the caller's voice, and a receiver, that amplifies sound from an incoming call In the transmitter there are two common kinds of transmitters: the carbon transmitter, and the electret transmitter The carbon transmitter uses carbon granules between metal plates called, electrodes, with one consisting of a thin diaphragm that moves by pressure from sound waves and transmits them to the carbon granules These electrodes conduct electricity flowing through the carbonThe sound waves hit the diaphragm causing the electrical resistance of the carbon to vary The electret transmitter is composed of a thin disk of metal-coated plastic held above a thicker, hollow metal disk
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