Heat pump and incandescent light bulb: what they have in common

1. Step 1. Heat pump — is part of — Tumble dryer. Heat-pump models.
2. Step 2. Tumble dryer — has part — Heating element. A heater.
3. Step 3. 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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