Question

What is a galvanometer called when calibrated to read current?

Answer 1

1. A galvanometer can be calibrated to read current, it can be called an Ammeter.
   
2. A galvanometer is an instrument that shows a deflection when current is passed through it. In this way, we can infer whether the current is passing through it or not.
3. It turns out that there is a direct linear relationship between the passing current and the angle of deflection. This means that the relationship is of the form $i=K·\theta$ where $i$ is the current passing through the galvanometer and $\theta$ is the angle of deflection shown by the galvanometer. $K$ is constant for a given galvanometer or galvanometer constant.
4. A galvanometer is generally a very sensitive device to current.
5. Only small currents can be measured in Galvanometer.
6. A galvanometer records the amount of current that flows through it.
7. Typically, a galvanometer can measure currents of the order of mA.
8. A shunt resistance of very low value, denoted by the letter $"R"$ is connected in parallel with the galvanometer so that it may measure currents of the magnitude of the main current.
   Hence, it is called Shunted Ammeter.