Photovoltaic effect and diesel engine: what they have in common

1. Step 1. Photovoltaic effect — is used in — Solar panel. The photoelectric effect in a semiconductor.
2. Step 2. Solar panel — is a kind of — Electric generator. A solar panel also generates electricity — from light rather than rotation.
3. Step 3. Electric generator — is part of — Diesel locomotive. The generator powers the traction motors.
4. Step 4. Diesel locomotive — has part — Diesel engine. The diesel turns a generator.

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