An ammeter whose resistance is 180 Ω gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is :-

Question

An ammeter whose resistance is 180 Ω gives full scale deflection when current is 2 mA. The shunt required to convert it into an ammeter reading 20 mA (in ohms) is :- (A) 18 (B) 20 (C) 0.1 (D) 10

Tardigrade Admin · Accepted Answer

( I - I g ) s = I g R g S =(180 × 2 mA /(20 mA -2 mA )) =20 Ω

Q. An ammeter whose resistance is $180 Ω$ gives full scale deflection when current is $2 m A$ . The shunt required to convert it into an ammeter reading $20 m A$ (in ohms) is :-

18

20

0.1

10

$(I - I_{g}) s = I_{g} R_{g}$
$S = \frac{180 \times 2 m A}{( 20 m A - 2 m A )}$
$= 20 Ω$

Q. An ammeter whose resistance is 180Ω gives full scale deflection when current is 2mA. The shunt required to convert it into an ammeter reading 20mA (in ohms) is :-

18

20

0.1

10

(I−Ig​)s=Ig​Rg​ S=(20mA−2mA)180×2mA​ =20Ω

Q. An ammeter whose resistance is $180 Ω$ gives full scale deflection when current is $2 m A$ . The shunt required to convert it into an ammeter reading $20 m A$ (in ohms) is :-

$(I - I_{g}) s = I_{g} R_{g}$
$S = \frac{180 \times 2 m A}{( 20 m A - 2 m A )}$
$= 20 Ω$