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

A millivoltmeter of range ' 0-50mv ' and resistance 50\Omega is to be converted into an ammeter of range 0-1A. 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 voltmeter, R=50\Omega, max voltage=0.05V. Connecting a shunt S in parallel with the multivoltmeter and using this combination in between the points A and B, we shall get an ammeter to meaure a maximum current I. 

\\Now\ I_S. S=I_V R\\\\ S=\frac{I_V}{I_S} R=\frac{I_V}{1-I_V} R=\frac{V_R}{I-V / R} \cdot R=\frac{V}{I-V / R}=\frac{0.05}{1-\frac{0.05}{50}}\\ =0.05 \Omega

Posted by

manish painkra

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