Answer to Question #247213 in Physics for Max

Question #247213

A galvanometer of internal resistance 100Ω gives a full scale deflection for a current of 10 mA. Calculate the values of the resistance necessary to convert the galvanometer to an ammeter reading up to 10 A


1
Expert's answer
2021-10-06T08:15:08-0400

Given:

R0=100ΩR_0=100\:\Omega

I0=10mA=0.01AI_0=10\:\rm mA=0.01\: A

I=10AI=10\:\rm A


The resistance of the shunt is given by

R=I0II0R0=0.01100.01100=0.1ΩR=\frac{I_0}{I-I_0}R_0=\frac{0.01}{10-0.01}*100=0.1\:\Omega


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