Silicon solar cell and truck: what they have in common

1. Step 1. Silicon solar cell — is part of — Solar panel. A silicon wafer with a p–n junction.
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 — Air brake. Air brakes.
5. Step 5. Air brake — is part of — Truck. Air brakes, as on trains.

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