Landlines

Landlines work like this:



1.) The sound energy in your voice makes the air vibrate. Vibrating air carries the sound energy into the phone.

2.) The diaphragm in the mouthpiece microphone converts sound energy into electrical energy.

3.) The electrical energy travels from the phone, via exchanges, to your friend's phone.

4.).) A diaphragm in the earpiece loudspeaker of your friend's phone converts the incoming electrical energy back to sound energy.

5.) The sound energy travels out from the earpiece into your friend's ear.