Question

How does a ammeter differ from an galvanometer?

• A. The galvanometer alone can measure extremely small currents. The ammeter cannot.
• B. The galvanometer can deflect in both directions showing direction of current. The ammeter cannot.
• C. The ammeter has a shunt connected in series. Galvanometer does not.
• D. Ammeter is connected in series in the arm where you want to measure current. Galvanometer is connected in parallel.

Answer 1

The correct option is B The galvanometer can deflect in both directions showing direction of current. The ammeter cannot.

The galvanometer is a device where the needle rotates to the left to indicate direction of current from right terminal to left terminal and vice versa. It shows direction of current through the device. This is useful because there may be instances (like Wheatstone bridge or potentiometer) where the current might flow either way depending on the potential balance we create using the device.