Making a simple telephone
Alexander Graham Bell
invented the telephone
Two main parts of a
telephone
receiver
(collects
incoming sounds)
microphone
(sends sounds
down a wire)
The microphone changes sound waves
doessignals
a telephone
toHow
electrical
and pass work?
them
down the phone.
The electrical signals are changed
How
telephone
back
to does
sound awaves
and are work?
collected
by the receiver.
A simple telephone
microphone
(sends sounds
down a wire)
receiver
(collects
sounds)
How does a paper cup telephone
work?
Sound waves travel from one cup
(microphone) to another (receiver)
through the string (object).
How to make a paper cup
telephone?
You will need:
2 paper cups
Some string
Steps
1. Make a hole in the bottom
of each paper cup.
2. Put the string into the hole.
3. Tie a knot so that the string
doesn’t come out from the
cup.
Reminder
You have to keep the
string straight for
best listening quality.