How do Telephones work?

The way that Telephones work is similar in some ways to television, but the transmission uses an electric current rather than air waves, and telephones transmit only sound, not pictures.

When you speak on the Telephone, the microphone inside the mouthpiece transforms the sound waves into electrical impulses. These are transmitted through the telephone cable to the ear piece of the other person’s receiver. This turns the impulses into sounds which are nearly identical to those made by the caller, so that it is like listening to the actual voice of the person talking.

Years ago, and still today in some isolated places, you had to ask the operator or at the telephone exchange to connect your telephone with someone else’s in order to speak to them. Nowadays, thanks to the progress of electronics, the connection is made automatically, even to countries on the other side of the world.