Tallow and car: what they have in common

1. Step 1. Tallow — is used in — Oil lamp. The fuel was animal fat, later oil.
2. Step 2. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
3. Step 3. Incandescent light bulb — evolved into — LED lamp. It replaced incandescent bulbs.
4. Step 4. LED lamp — has part — Rectifier. The driver in the base rectifies mains current and limits the LED current; in an ordinary bulb it has no transformer.
5. Step 5. Rectifier — is part of — Alternator. A diode bridge.
6. Step 6. Alternator — is part of — Car. A generator.

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