Making a simple telephone

Alexander Graham Bell invented the telephone

receiver(collects incoming sounds)

microphone(sends sounds down a wire)

Two main parts of a telephone

How does a telephone work?

The microphone changes sound waves to electrical signals and pass them down the phone.

How does a telephone work?

The electrical signals are changed back to sound waves and are 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 cupsSome 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 thestring straight forbest listening quality.