Physics - EMI/AC Question with Solution | TestHub

P: current and voltage in phase $\Rightarrow$ only R, or LCR in resonance: P$\to 1,5$.

Q: current leads voltage by $\pi /2$ $\Rightarrow$ only C, so power factor $=\cos 90^{\circ }=0$: Q$\to 3$.

R: current leads voltage $\Rightarrow$ CR, or LCR with $X_C>X_L$: R$\to 1,4$.

S: current lags voltage $\Rightarrow$ LR, or LCR with $X_L>X_C$: S$\to 1,2$. Option (A).