Electrolysis and oil lamp: what they have in common

1. Step 1. Electrolysis — evolved from — Voltaic pile. The first electrolysis of water was powered by a voltaic pile.
2. Step 2. Voltaic pile — evolved into — Dry cell. A convenient form of the galvanic cell.
3. Step 3. Dry cell — is part of — Torch (flashlight). Batteries.
4. Step 4. Torch (flashlight) — has part — Incandescent light bulb. A bulb (today an LED).
5. Step 5. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.

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