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?
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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ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
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?
Expert Solution
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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