the telephone by 4gk
DESCRIPTION
This term 4GK are looking at inventions. We are learning how to write information reports.TRANSCRIPT
The Telephone
Information report4GK 2010
Telephones are
devices for
communicating
sound, especially
speech.
Tele- means long
distances and -phono
means sound, voice
or speech.
The telephones people
use came about from a
device invented by
Alexander Graham Bell
in 1876.
Although Bell is
recognised as the
inventor, many others
attempted to produce
such a device.Image: ALEXANDER GRAHAM BELL IN 3-D
By Okinawa Soba under a Creative Commons License Some rights reserved
Telephones are an important invention as they save people time when they need to communicate with someone in a hurry, over long distances.
Mailing a letter may take two weeks to reach another person. A telephone is instant.
Telephones are made using plastic and metal.
They come in many different colours such as black, silver, grey and cream.
The body of the telephone contains numbered keys 0 – 9.
A coiled wire protrudes from the side of the phone and is attached to the handset, which sits on the switch hooks.
At one end of the handset is the receiver and at the other end is the transmitter. Both the receiver and transmitter have holes punched into the plastic.
Inside the body of the
telephone is a circuit board.
Wires from the circuit board
are attached to the handset,
switch hook, keypad and wall
outlet.
Wires from the wall outlet are
attached to the wires in the
local telecommunications
system. In this way, the voice
is transmitted along wires to
another person who also has
this equipment.
When a call has to be made, the handset is lifted from the cradle and the receiver end is placed on the caller’s ear.
The transmitter is placed near the caller’s mouth.
The caller enters the other person’s telephone number by pressing the numbers on the keypad.
This sends an electric signal through the wires to the phone at the other end, which then rings.
Upon hearing the telephone
ring, the person receiving the
telephone call must pick up
their handset in order to
communicate with the caller.
These days are many different types of telephones, for example cordless phones and mobile phones.