Smartphone camera and transformer: what they have in common

1. Step 1. Smartphone camera — evolved from — Digital camera. A miniature digital camera.
2. Step 2. Digital camera — has part — Photographic flash. The flash lights the shot when it is dark.
3. Step 3. Photographic flash — has part — Capacitor. Energy is stored in a capacitor.
4. Step 4. Capacitor — is part of — Defibrillator. The energy of the shock is stored in a capacitor.
5. Step 5. Defibrillator — has part — Transformer. Stepping up the voltage.

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