Lighter und electrical telegraph: was sie gemeinsam haben

1. Schritt 1. Lighter — nutzt — Piezoelectric effect. Piezo lighters.
2. Schritt 2. Piezoelectric effect — wird verwendet in — Microphone. Piezo microphones turn sound pressure into voltage.
3. Schritt 3. Microphone — ist Teil von — Telephone. The handset microphone turns the voice into an electrical signal.
4. Schritt 4. Telephone — entwickelte sich aus — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).

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