Hanger hook and voltaic pile: what they have in common

1. Step 1. Hanger hook — is part of — Clothes hanger. For the barbell.
2. Step 2. Clothes hanger — is made of — Steel. Wire.
3. Step 3. Steel — is material for — Uninterruptible power supply. The hull is steel.
4. Step 4. Uninterruptible power supply — has part — Lead–acid battery. A battery.
5. Step 5. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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