Question

In the circuit shown the readings of ammeter and voltmeter are 4A and 20V respectively. the meters are non metal -ideal , then R is

• A. $5\Omega$
• B. less than $5\Omega$
• C. grater than $5\Omega$
• D. between $4\Omega$ and $5\Omega$

Answer 1

The correct option is A $5\Omega$

Given,

Reading of Ammeter $I=4A$

reading of Voltmeter $V=20V$

We know that

$V=IRR=\frac{V}{I}$

Putting value of $I$ and value of $V$ in above equation

$R=\frac{20}{4}=5\Omega$

Correct option is A