Alternator and davy lamp: what they have in common

1. Step 1. Alternator — has part — Rectifier. A diode bridge.
2. Step 2. Rectifier — is part of — LED lamp. The driver in the base rectifies mains current and limits the LED current; in an ordinary bulb it has no transformer.
3. Step 3. LED lamp — evolved from — Incandescent light bulb. It replaced incandescent bulbs.
4. Step 4. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.
5. Step 5. Oil lamp — has part — Wick. The wick feeds oil to the flame.
6. Step 6. Wick — is part of — Davy lamp. A wick.

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