Hydrogen energy and gas lamp: what they have in common

1. Step 1. Hydrogen energy — uses — Electrolyser. Producing hydrogen.
2. Step 2. Electrolyser — has part — Rectifier. A direct-current supply.
3. Step 3. 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.
4. Step 4. LED lamp — evolved from — Incandescent light bulb. It replaced incandescent bulbs.
5. Step 5. Incandescent light bulb — evolved from — Gas lamp. Electricity displaced gas lighting.

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