How does the internal resistance/behavior change in a multi-range ammeter as its range is extended_____________________?
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Answer: A. shunt value decreases
Explanation
Extending an ammeter range requires allowing a much larger total current to flow through the device safely. A smaller shunt resistance must be placed in parallel so that excess current bypasses the delicate meter movement. Reducing the shunt resistance value ensures the galvanometer needle never exceeds its maximum safe deflection limit. An ammeter is an electrical instrument used to measure electric current flowing through a circuit branch. A shunt resistor is a very low resistance component connected in parallel to divert major current fractions. Galvanometers are sensitive current-measuring devices that can easily burn out if subjected to excessive electrical current.
Option B states the shunt value increases, which would restrict current diversion and damage the sensitive meter movement. Option C claims the shunt value remains constant, making it impossible to extend the measurement range of the ammeter. Option D is incorrect because a specific engineering solution involving a decreased shunt resistor is required.
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