Concrete dam wall and solar panel: what they have in common

1. Step 1. Concrete dam wall — is part of — Dam. A mass of concrete that holds back the water by its weight.
2. Step 2. Dam — is part of — Hydroelectric power station. The dam creates the head of water.
3. Step 3. Hydroelectric power station — has part — Electric generator. Generators.
4. Step 4. Electric generator — includes — Solar panel. A solar panel also generates electricity — from light rather than rotation.

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