Torch (flashlight) and data centre: what they have in common

1. Step 1. Torch (flashlight) — has part — Dry cell. Batteries.
2. Step 2. Dry cell — evolved from — Voltaic pile. A convenient form of the galvanic cell.
3. Step 3. Voltaic pile — evolved into — Lead–acid battery. Planté’s battery developed the idea of a chemical current source by making it rechargeable.
4. Step 4. Lead–acid battery — is part of — Uninterruptible power supply. A battery.
5. Step 5. Uninterruptible power supply — is part of — Data centre. Backup power.

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