The boxes A and B shown in the circuit have series combination of $L,C$ and R inside them. Each box has two elements. (It means none of the boxes has only L or only C or $L,C$ and R). The source voltage is 100 V. When only $S_1$ is closed (and $S_2$ is open), the current through the source is $2A$ and the current leads in phase by 90°. When $S_2$ is closed and $S_1$ opened, the current through the source is 1A and the power dissipated in the circuit is 80W. The current lags in phase with respect to the source voltage.