TELEPHONE

TELEPHONE

            A telephone is a device that transforms voices into electrical signalso that  people can communicate over lng distances. Telephone have a number of parts. On the outside of the handset there is a mouthpiece, an earpiece, and a keypad. Inside the mouthpiece is a microphone which contains a plastic disk called diaphragm. The earpice conyains a loudspeaker. People talk to each other on the telephone through the microphones in the handset. The sound of the caller’s voice causes the diaphragm to vibrate. As it vibrates, it generates an electrical signal that passes down the telephone line to the receiving telephone. When the receiving telephone gets the signals, the diaphragm in the earpiece loudspeaker also vibrates and creates the sound of the person’s voice at the other end.

          There are many different kinds of phones. Most home and offices phones have key pads and many are now portable. Mobile phones are not physically connected to a network and can be used from almost anywhere. Videophones which contain a small TV camera, gives users a chance to see each other.

Source : LKS bahasa inggris SMA XI