Question

To convert a moving coil galvanometer into an ammeter, we need to connect a:

• A. small resistance in parallel with it
• B. large resistance in series with it
• C. small resistance in series with it
• D. large resistance in parallel with it

Hint:

An ammeter should have very low resistance to minimize the voltage drop across it, ensuring an accurate current reading.

Answer 1

The Correct Option is A

Step 1: A moving coil galvanometer is a highly sensitive device used to detect small currents. 
Step 2: To modify it into an ammeter, which can measure large currents, a shunt resistance (\( R_s \)) is connected in parallel: \[ R_s = \frac{G}{\left( \frac{I}{I_g} - 1 \right)} \] where \( G \) represents the galvanometer's resistance, \( I \) is the total current, and \( I_g \) is the current corresponding to full-scale deflection of the galvanometer. \bigskip