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  • A galvanometer having a coil resistance of   shows full scale deflection when a current of 1.0 A pass

A galvanometer having a coil resistance of 60 \Omega  shows full scale deflection when a current of 1.0 A passes through it.It can be converted into an ammeter to read current upto 5.0 A by-

Option: 1

putting in series a resistance of 15\Omega


Option: 2

Putting in series a resistance of 240\Omega


Option: 3

Putting in parallel a resistance of 15\Omega


Option: 4

Putting in parallel a resistance of 240\Omega


Answers (1)

best_answer

G=60 \Omega, I g=1 \mathrm{~A}, I=5 \mathrm{~A}

Let, S be the shunt resistance connected in parallel to galvanometer, 

\begin{aligned} I_{g G} & =\left(I-I_{g}\right) \mathrm{S} \\ S & =\frac{I_{g} h}{I-I_{g}}=\frac{1}{5-1} \times 60=15 \Omega \end{aligned}

Posted by

rishi.raj

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