Candle and telephone: what they have in common

1. Step 1. Candle — has part — Wick. A candle’s wick.
2. Step 2. Wick — is part of — Lighter. Petrol lighters have a wick.
3. Step 3. Lighter — uses — Piezoelectric effect. Piezo lighters.
4. Step 4. Piezoelectric effect — is used in — Microphone. Piezo microphones turn sound pressure into voltage.
5. Step 5. Microphone — is part of — Telephone. The handset microphone turns the voice into an electrical signal.

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