An ammeter gives full scale deflection when a | vedclass

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(D) Let $G$ be the resistance of the ammeter and $S$ be the shunt resistance.Given,full scale deflection current $i_g = 1.0 \ A$.Target range $i = 10

Vedclass · Accepted Answer

$9:1$

Vedclass · Answer

(D) Let $G$ be the resistance of the ammeter and $S$ be the shunt resistance.Given,full scale deflection current $i_g = 1.0 \ A$.Target range $i = 10 \ A$.The formula for shunt resistance is $S = \frac{i_g G}{i - i_g}$.Rearranging the formula to find the ratio of resistance $G$ to shunt resistance $S$:$\frac{G}{S} = \frac{i - i_g}{i_g}$.Substituting the values:$\frac{G}{S} = \frac{10 - 1}{1} = \frac{9}{1}$.Thus,the ratio is $9:1$.

An ammeter gives full scale deflection when a current of $1.0 \ A$ is passed through it. To convert it into a $10 \ A$ range ammeter,the ratio of its resistance $(G)$ to the shunt resistance $(S)$ will be:

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