Lighter e electrical telegraph: o que têm em comum

1. Passo 1. Lighter — utiliza — Piezoelectric effect. Piezo lighters.
2. Passo 2. Piezoelectric effect — é utilizado em — Microphone. Piezo microphones turn sound pressure into voltage.
3. Passo 3. Microphone — faz parte de — Telephone. The handset microphone turns the voice into an electrical signal.
4. Passo 4. Telephone — evoluiu de — Electrical telegraph. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).

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