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The Telephone
itself is a rather simple appliance. A microphone, called
the transmitter, and an earphone, called the receiver, are contained in the
handset. The microphone converts speech into its direct electrical analog, which
is transmitted as an electrical signal; the earphone converts received
electrical signals back to sound. The switch hook determines whether current
flows to the telephone, thereby signaling the central office that the telephone
is in use. The ringer responds to a signal sent by the central office that
causes the telephone to ring. As simple a device as the te ....
Word count: 317 - Page count: 2
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