Concrete dam wall e solar panel: o que têm em comum

1. Passo 1. Concrete dam wall — faz parte de — Barragem. A mass of concrete that holds back the water by its weight.
2. Passo 2. Barragem — faz parte de — Hydroelectric power station. The dam creates the head of water.
3. Passo 3. Hydroelectric power station — tem como parte — Electric generator. Generators.
4. Passo 4. Electric generator — inclui — Solar panel. A solar panel also generates electricity — from light rather than rotation.

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