Power amplifier stage and camera: what they have in common

1. Step 1. Power amplifier stage — is part of — Hi-fi amplifier. Power transistors drive the speakers.
2. Step 2. Hi-fi amplifier — has part — Transformer. The power supply is a transformer.
3. Step 3. Transformer — is part of — Defibrillator. Stepping up the voltage.
4. Step 4. Defibrillator — has part — Capacitor. The energy of the shock is stored in a capacitor.
5. Step 5. Capacitor — is part of — Photographic flash. Energy is stored in a capacitor.
6. Step 6. Photographic flash — is part of — Camera. A flash.

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