Resonant chamber and transformer: what they have in common

1. Step 1. Resonant chamber — is part of — Whistle. It sets the pitch.
2. Step 2. Whistle — uses — Resonance. Resonance of the chamber.
3. Step 3. Resonance — is used in — Tesla coil. A resonant circuit.
4. Step 4. Tesla coil — has part — Capacitor. A capacitor.
5. Step 5. Capacitor — is part of — Defibrillator. The energy of the shock is stored in a capacitor.
6. Step 6. Defibrillator — has part — Transformer. Stepping up the voltage.

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