Elektrokardiograph und lead–acid battery: was sie gemeinsam haben
- Schritt 1. Elektrokardiograph — entwickelte sich aus — Galvanometer. Einthoven’s string galvanometer.
- Schritt 2. Galvanometer — entwickelte sich zu — Amperemeter. An ammeter is a galvanometer with a scale in amperes and a shunt that carries most of the current.
- Schritt 3. Amperemeter — nutzt — Gleichstrom. In a school circuit the ammeter shows the direct current from the battery.
- Schritt 4. Gleichstrom — wird verwendet in — Voltaic pile. It produces direct current.
- Schritt 5. Voltaic pile — entwickelte sich zu — Lead–acid battery. Planté’s battery developed the idea of a chemical current source by making it rechargeable.