A galvanometer has a coil resistance of ?galv=24.2 Ω It is to be made into an ammeter with a full‑scale deflection equal to ?=2.25 A. If the galvanometer deflects full scale for a current of ? galv=225 mA, what size shunt resistor should be used?

Physics for Scientists and Engineers, Technology Update (No access codes included)
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Chapter27: Current And Resistance
Section: Chapter Questions
Problem 27.34P: Review. Ail aluminum rod has a resistance of 1.23 at 20.0C. Calculate the resistance of the rod at...
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A galvanometer has a coil resistance of ?galv=24.2 Ω It is to be made into an ammeter with a full‑scale deflection equal to ?=2.25 A. If the galvanometer deflects full scale for a current of ? galv=225 mA, what size shunt resistor should be used?

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Step 1

Given

The resistance of galvanometer Rg =24.2 ohm

The current for full deflection of galvanometer Ig = 225 mA = 0.225 A

The current for full deflection of Ammeter IA = 2.25 A

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