Question

What is the phase difference between voltage and current in a LCR SERIES circuit at resonance?

Answer 1

For LCR series circuit we know that,

$Z=\sqrt{R^2+(X_L-X_C{)}^2}$

Since, they are in resonance i.e, $X_L=X_C$

$\Rightarrow$ $Z=R$

It means that circuit is purely resistive, and in purely resistive circuit voltage and current are in phase.

So, phace diffrence $\varphi =0^o$