Question

To convert a galvanometer into an ametre we connect:

• A. Low resistance in series
• B. Low resistance in parallel
• C. High resistance series
• D. Higher resistance in parallel

Answer 1

Answer:

B. Low resistance in parallel

Principle:

• An ammeter is used to measure electric current in a circuit.

• A galvanometer is a sensitive instrument that can detect small currents but cannot measure large currents accurately.

• To convert a galvanometer into an ammeter, its sensitivity to current needs to be reduced, and its range needs to be increased.

Method of Conversion:

• A low resistance, called a shunt resistance, is connected in parallel with the galvanometer.

• The galvanometer coil has a high resistance (R_g).

• The shunt resistance (R_s) is chosen to be very small.