Question:
Two similar galvanometers are converted into an ammeter and a millammeter. The shunt resistance of ammeter as compared to the shunt resistance of millammeter will be
Two similar galvanometers are converted into an ammeter and a millammeter. The shunt resistance of ammeter as compared to the shunt resistance of millammeter will be
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The shunt resistance is inversely proportional to the current range of the instrument. An ammeter, which measures higher currents, needs a smaller shunt resistance compared to a millammeter.
Updated On: Apr 16, 2025
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The Correct Option is A
Solution and Explanation
When a galvanometer is converted into an ammeter or a millammeter, a shunt resistance is connected in parallel with the galvanometer to bypass excess current. The value of the shunt resistance is inversely proportional to the current range. Since an ammeter is used for measuring larger currents than a millammeter, the required shunt resistance for the ammeter will be less than that for the millammeter. Therefore, the shunt resistance of the ammeter will be less. Thus, the correct answer is: Less.
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