Fume hood and incandescent light bulb: what they have in common

1. Step 1. Fume hood — has part — Electric fan. A fan.
2. Step 2. Electric fan — is part of — Air fryer. A fan.
3. Step 3. Air fryer — has part — Heating element. A heater.
4. Step 4. 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.

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