Question 6: Current Electricity

Question

In the adjoining circuit diagram, the
readings of ammeter and voltmeter are 2 A
and 120 V, respectively. If the value of R is
75$\Omega$, then the voltmeter resistance will be
![](https://app-content.cdn.examgoal.net/fly/@width/image/jaoe38c1m3o0uht4/9f4c608d-7a49-4fc0-9edc-ccb23f86c7a9/2d5a3280-a638-11ef-a300-b723d4598e73/file-jaoe38c1m3o0uht5.png?format=png)

Accepted Answer

$\because V_{A B}=\left(I-I_gight) R=I_g \cdot G$
where, G = voltmeter (resistance).
$\begin{array}{ll}
	ext { Given, } & V_{A B}=120 \mathrm{~V}, I=2 \mathrm{~A}, R=75 \Omega \\
\Rightarrow & 120=\left(2-I_gight) 75 \Rightarrow I_g=0.4 \mathrm{~A} \\
	ext { Now, } & V_{A B}=I_g G \Rightarrow G=\frac{120}{0.4}=300 \Omega
\end{array}$
![](https://app-content.cdn.examgoal.net/fly/@width/image/jaoe38c1m3o2xsgc/aaf86391-4e05-4fcb-9a56-1511f30065af/5b42d8c0-a640-11ef-a300-b723d4598e73/file-jaoe38c1m3o2xshh.png?format=png)

Answer

100 $\Omega$

Answer

150 $\Omega$

Answer

300 $\Omega$

Answer

75 $\Omega$

Current Electricity

In the adjoining circuit diagram, the readings of ammeter and voltmeter are 2 A and 120 V, respectively. If the value of R is 75\Omega, then the voltmeter resistance will be

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