1. Making a simple telephone

2. Alexander Graham Bell invented the telephone
( )

3. Two main parts of a telephone
receiver
(collects
incoming sounds)
microphone
(sends sounds down a wire)

4. How does a telephone work?
The microphone changes sound waves to electrical signals and pass them down the phone.
How does a telephone work?

5. How does a telephone work?
The electrical signals are changed back to sound waves and are collected by the receiver.
How does a telephone work?

6. A simple telephone microphone (sends sounds down a wire) receiver
(collects
sounds)

7. How does a paper cup telephone work?
Sound waves travel from one cup (microphone) to another (receiver) through the string (object).

8. How to make a paper cup telephone?
You will need:
2 paper cups
Some string

9. Steps
Make a hole in the bottom of each paper cup.
Put the string into the hole.
Tie a knot so that the string doesn’t come out from the cup.

10. best listening quality.
Reminder
You have to keep the
string straight for
best listening quality.