Headphone ear cushions and davy lamp: what they have in common

1. Step 1. Headphone ear cushions — is part of — Headphones. Soft pads.
2. Step 2. Headphones — has part — Copper wire. A cable.
3. Step 3. Copper wire — is part of — Electric generator. Windings.
4. Step 4. Electric generator — is part of — Geothermal power station. The turbine turns the generator.
5. Step 5. Geothermal power station — uses — Heat transfer. The Earth’s heat warms water.
6. Step 6. Heat transfer — is used in — Davy lamp. The gauze draws off heat and stops the flame.

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