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 (a) 0.03 Ω (b) 0.3 Ω (c) 0.9 Ω (d) 0.09 Ω

Answer: (d). Shunt for an ammeter: S = (G Ig)/(I - Ig), with Ig = 1 A and G = 0.81 Ω. S = (0.81 × 1)/(10 - 1) = 0.81/9 So the answer is (d) 0.09 Ω.

An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm… | JEE Main 2003 (AIEEE)

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Kirchhoff's Laws & Measuring Instruments

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

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Answer: (d)

Shunt for an ammeter: $S = \frac{G\,I_g}{I - I_g}$ , with $I_g = 1$ A and $G = 0.81\ \Omega$ .
$S = \frac{0.81 \times 1}{10 - 1} = \frac{0.81}{9}$
So the answer is (d) $0.09\ \Omega$ .

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