The telephone is a device that converts sound into electrical signals for communication. It allows two or more people to have a conversation when they are too far apart to hear each other. Signals are carried through wires or transmitted through electromagnetic waves.
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PUHELINPuhelin on laite, joka muuntaa äänen sähköiseksi signaaliksi viestintään. Sen avulla kaksi tai useampi ihminen voi keskustella, kun he ovat liian kaukana toisistaan. Signaalit kulkevat johtojen kautta tai lähetetään sähkömagneettisten aaltojen kautta.
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