Colheitadeira e voltaic pile: o que têm em comum

1. Passo 1. Colheitadeira — tem como parte — Motor diesel. Self-propelled combines run on diesels.
2. Passo 2. Motor diesel — faz parte de — Submarine. Diesel-electric submarines.
3. Passo 3. Submarine — tem como parte — Lead–acid battery. Underwater, electric motors run on batteries.
4. Passo 4. Lead–acid battery — evoluiu de — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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