Personal computer and camera: what they have in common

1. Step 1. Personal computer — has part — RAM. RAM.
2. Step 2. RAM — has part — Capacitor. A DRAM bit is stored in a tiny capacitor.
3. Step 3. Capacitor — is part of — Photographic flash. Energy is stored in a capacitor.
4. Step 4. Photographic flash — is part of — Camera. A flash.

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