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Making a simple telephone. Alexander Graham Bell invented the telephone.

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Presentation on theme: "Making a simple telephone. Alexander Graham Bell invented the telephone."— Presentation transcript:

1 Making a simple telephone

2 Alexander Graham Bell invented the telephone

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

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

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

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 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 doesnt come out from the cup.

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

11


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