For the circuit given above, the Thevenin's resistance across the terminals $$A$$ and $$B$$ is

In the given Fig. the Thevenin's equivalent pair (voltage, impedence), as seen at the terminals $$P-Q$$, is given by

In Fig. the potential difference between points $$P$$ and $$Q$$ is

Two ac sources feed a common variable resistive load as shown in Fig. Under the maximum power transfer condition, the power absorbed by the load resistance $${R_L}$$ is