How telephone works

Done by:                                                                                                 Date:

Mohd KhairulAnwar bin Hj Abdullah                                                       27/11/2008

(EP/24/044/08)

Group 2

 

Topic: How a telephone works               

 

   In this essay, I will describe how a telephone works. When a person speaks into a telephone, the sound waves created by his voice enter the mouthpiece. An electric current carries the sound to the telephone of the person he is talking to.

   A telephone has two main parts which is the transmitter and the receiver. The transmitter of a telephone serves as a sensitive electric ear. It lies behind the mouthpiece of the phone. Like the human ear, the transmitter has an eardrum called as diaphragm. When a person talks into the telephone, the sound waves strike the diaphragm making it to vibrate. The receiver serves as an electric mouth. Like a human voice, it has vocal cords. As the diaphragm moves in and out, it pulls and pushes the air in front of it. The pressure on the air sets up sound waves which strike the ear of the listener and he hears the words of the speaker.

   As you can see, a transmitter and a receiver are the main parts in making the telephone works. The vibration of diaphragm produces sound waves making it clear to hear.