Question

If an ammeter is to be used in place of a galvanometer, then we must connect

• A. low resistance in parallel.
• B. high resistance in series.
• C. high resistance in parallel.
• D. low resistance in series.

Hint:

When replacing a galvanometer with an ammeter, it is important to use low resistance in parallel to ensure the current is measured accurately without significant influence on the circuit.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
An ammeter measures current and must have very low total resistance to avoid affecting the circuit. A galvanometer can be converted into an ammeter by bypassing most of the current through a parallel branch.
Step 2: Detailed Explanation:
A galvanometer is very sensitive and has a high coil resistance. To measure larger currents:
- We connect a "shunt" resistance.
- This shunt must be a very low resistance value.
- It must be connected in parallel so that the majority of the current flows through the shunt rather than the delicate galvanometer coil.
Step 3: Final Answer:
We must connect a low resistance in parallel.