Question

In the circuit shown in figure, an ideal ammeter and an ideal voltmeter are used. When the key is open, the voltmeter reads 1.54 V. When the key is closed, the ammeter reads 1.0 A and the voltmeter reads 1.03 V. The resistance R is

• A. 0.5 $\omega$
• B. 1.03 $\omega$
• C. 1.53 $\omega$
• D. 0.53 $\omega$

Answer 1

Answer: (B)

1.03 $\omega$

A careful analysis would show that the voltage along R is 1.03 V. So

$1.03=1\times R$ or $R=1.03\omega$