List of top Physics Questions on AC Voltage Applied to a Series LCR Circuit asked in CBSE Class XII

(i) A series combination of L, C and R is connected to an ac source \(V = V_m \sin \omega t\). Obtain:

(I) the impedance of the circuit using phasor diagram,

(II) the expression for the instantaneous current I, and

(III) the phase relationship of current to the applied voltage.

(ii) Define power factor of an ac circuit. State the conditions under which it is: (I) maximum, (II) minimum.