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Question: An ammeter gives full scale deflection when current of 1.0 A is passed in it. To convert it into 10 ...

An ammeter gives full scale deflection when current of 1.0 A is passed in it. To convert it into 10 A range ammeter, the ratio of its resistance and the shunt resistance will be

A

1 : 9

B

1 : 10

C

1 : 11

D

9 : 1

Answer

9 : 1

Explanation

Solution

S=igG(i−ig)S = \frac { i _ { g } G } { \left( i - i _ { g } \right) } ⇒ GS=i−igig=10−11=91\frac { G } { S } = \frac { i - i _ { g } } { i _ { g } } = \frac { 10 - 1 } { 1 } = \frac { 9 } { 1 }