Question

The value of current at resonance in a series $\text{LCR}$ circuit is affected by the value of

• A. $\text{R}$ only
• B. $\text{C}$ only
• C. $\text{L}$ only
• D. $\text{L,C}$ and $\text{R}$

Answer 1

The correct option is A $\text{R}$ only

In a series $\text{LCR}$ circuit,

At resonance, $X_L=X_C$

$\therefore Z=R$

As the impedence is minimum, current in the circuit is maximum and is affected only by the value of $\text{R}$.

Hence, option (a) is the correct answer.