Voltmeter e submarine: o que têm em comum

1. Passo 1. Voltmeter — funciona como — Amperímetro. They are built alike, but an ammeter goes in series with the circuit and a voltmeter in parallel.
2. Passo 2. Amperímetro — utiliza — Corrente contínua. In a school circuit the ammeter shows the direct current from the battery.
3. Passo 3. Corrente contínua — é utilizado em — Voltaic pile. It produces direct current.
4. Passo 4. Voltaic pile — evoluiu para — Lead–acid battery. Planté’s battery developed the idea of a chemical current source by making it rechargeable.
5. Passo 5. Lead–acid battery — faz parte de — Submarine. Underwater, electric motors run on batteries.

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