Q. A millivoltmeter of 25 millivolt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be
A) 0.05
B) 0.001
C) 0.01
D) 1
Explanation
[Solution from source] The meter gives full deflection at 25 mV across it; with the shunt carrying almost all 25 A, the shunt resistance is S ≈ V/I = 25 × 10⁻³/25 = 10⁻³ Ω = 0.001 Ω. 0.01 Ω would pass only 2.5 A at 25 mV. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.