Question

Under what conditions the
• [(i)] impedance of the circuit is minimum?
• [(ii)] wattless current flows in the circuit?

Hint:

Remember these important AC circuit conditions: \[ X_L=X_C \quad\Longrightarrow\quad \text{Resonance} \] \[ Z=R \quad\Longrightarrow\quad \text{Minimum Impedance} \] \[ \phi=90^\circ \quad\Longrightarrow\quad \text{Wattless Current} \] These results are frequently used in board examinations and numerical problems.

Answer 1