Rice cooker and davy lamp: what they have in common

1. Step 1. Rice cooker — has part — Heating element. A heater.
2. Step 2. Heating element — works like — Incandescent light bulb. A lamp and a heater use the same effect — a conductor heated by current; they differ in purpose, light or heat.
3. Step 3. Incandescent light bulb — evolved from — Oil lamp. The electric lamp replaced oil and gas lamps.
4. Step 4. Oil lamp — has part — Wick. The wick feeds oil to the flame.
5. Step 5. Wick — is part of — Davy lamp. A wick.

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