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  • I need help with An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A the value of the required shunt is

An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A the value of the required shunt is

  • Option 1)

    0.03\Omega

  • Option 2)

    0.3\Omega

  • Option 3)

    0.9\Omega

  • Option 4)

    0.09\Omega

 

Answers (1)

As we learnt in

Moving coil galvanometer -

It is a very sensitive instrument used to measure the small current.Galvanometer gives the deflection which is proportional to electric current flowing through it.

-

 

\frac{S}{S+G}=\frac{I_{g}}{I}\Rightarrow S=\frac{I_{g}G}{I-I_{g}}

\therefore \; \; \; S=\frac{1\times 0.81}{10-1}=\frac{0.81}{9}=0.09\, \Omega \; in\; parallel.


Option 1)

0.03\Omega

Incorrect option

Option 2)

0.3\Omega

Incorrect option

Option 3)

0.9\Omega

Incorrect option

Option 4)

0.09\Omega

Correct option

Posted by

Vakul

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