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  • A millivoltmeter of range '0 - 50 m V' and resistance  is to be converted into an ammeter of

A millivoltmeter of range '0 - 50 m V' and resistance 50\Omega is to be converted into an ammeter of range 0 - 1 A. How can it be done. Find the required value of shunt resistance 

Option: 1

0.05 \Omega


Option: 2

0.08 \Omega


Option: 3

0.10 \Omega


Option: 4

0.19 \Omega


Answers (1)

best_answer

Resistance of the millivoltmeter, R = 50 \Omega, max voltage = 0.05V 

Connecting a shunt S is parallel with the millivoltmeter and using these combination is between the points A and B, we get an ammeter to measure a maximum current I. 

Now, I_S.S=I_VR

        S=\frac{I_V}{I_S}R= \frac{I_V}{I-I_V}R

             =\frac{V/R}{I-V/R}R

           =\frac{0.05}{1-\frac{0.05}{50}}

           =0.05 \Omega

Posted by

Divya Prakash Singh

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