Question

in a series LCR circuit obtain conditions under which impedance of the circuit is minimum and wattles current flows in the circuit

Answer 1

the condition is voltage across inductor should be 180 degree out of phase with respect to voltage across the capacitor such that

Answer 2

Hey !!

(i) he impedance of a series LCR circuit is give by,

    Z = √R² + (Xl - Xc)²

or For Z to be minimum, Xl = Xc (or ω = 1/√LC)

(ii) For wattless current to flow, circuit should not have any ohmic resistance, R = 0

ALTERNATIVELY

Power = Vrms Irms cosΦ

POWER = 0

∴ Wattless current flows when the impedance of the circuit is purely inductive/capacitive or the combination of the two.

GOOD LUCK !!