Ethernet and incandescent light bulb: what they have in common

1. Step 1. Ethernet — has part — Copper wire. Twisted pair.
2. Step 2. Copper wire — is part of — Transformer. Windings.
3. Step 3. Transformer — is part of — Power supply. A transformer.
4. Step 4. Power supply — has part — Rectifier. A rectifier.
5. Step 5. 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.
6. Step 6. LED lamp — evolved from — Incandescent light bulb. It replaced incandescent bulbs.

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