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

Viewed from the terminals $$A, B$$ the following circuit shown in Figure can be reduced to an equivalent circuit of a single voltage source in series with a single resistor with the following parameters:

For the circuit shown in Fig, the Norton equivalent source current value is _________ $$A$$ and its resistance is ___________ $$Ohms$$