Sound film and boiler: what they have in common

1. Step 1. Sound film — uses — Photovoltaic effect. The optical soundtrack was read by a photocell.
2. Step 2. Photovoltaic effect — is used in — Solar panel. The photoelectric effect in a semiconductor.
3. Step 3. Solar panel — is a kind of — Electric generator. A solar panel also generates electricity — from light rather than rotation.
4. Step 4. Electric generator — is part of — Thermal power station. Generators.
5. Step 5. Thermal power station — has part — Boiler. Boilers.

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