An ammeter of resistance $20 \Omega$ gives full scale deflection when $1 \mathrm{~mA}$ current flows through it. What is the maximum current that can be measured by connecting 4 resistors each of $16 \Omega$ in parallel with the meter?

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Aicharya · Accepted Answer

$\frac{1}{S}=\frac{4}{16}=\frac{1}{4}$ $S=4 \Omega$ $G=20 \Omega$ $i_{g}=1 \mathrm{~mA}=10^{-3} \mathrm{~A}$ $\left(i-i_{g}ight) 4=i_{g} G=10^{-3} 	imes 20=2 	imes 10^{-2}$ $i-i_{g}=\frac{1}{2} 	imes 10^{-2}$ $i=0.5 	imes 10^{-2}+10^{-3}=6 	imes 10^{-3}=6 \mathrm{~mA}$

An ammeter of resistance $20 \Omega$ gives full scale deflection when $1 \mathrm{~mA}$ current flows through…

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