A reactive element, in an a.c. circuit, causes the current flowing
to lead in phase by `pi/2` w.r.t applied voltage. Identify the element in this case.

A reactive element, in an a.c. circuit, causes the current flowing to lag in phase by pi/2 w.r.t applied voltage. Identify the element in this case.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Find current that flows in the circuit when series combination of X and Y is connected acorss same a.c. voltage.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Name the circuit elements X and Y.

When a circuit element X is conneted across a.c. sourceof emf 220sqrt2V , a current sqrt2 A flows through it and this current is in phase with applied voltage. When another element Y is connected across same a.c. source, the same current flows in the circuit, but it leads the voltages by pi//2. Plot a graph showing variation of net impedance of series combination of X and Y as a function of angular frequency of applied voltage.

In an a.c. circuit, with phase voltage V and current I, the power dissipated is

An alternating voltage of frequency f is applied across LCR circuit. Let f_r be the resonance frequency for the circuit. Will the current in the circuit lag, lead or remain in phase with the applied voltage when f>f_r ? Explain your answer in each case.

Show mathematically that in an a.c. circuit containing only inductance, the current lags behind the e.m.f. by a phase of pi/2 . An a.c. voltage E=E_0 sin omegat is applied across an inductor L. Obtain an expression for current I.

An electrical element X when connected to an alternating voltage source has current through it leading the voltage by pi//2 radian. Identify X and write an expression for its reactance.

When an electric device X is connected to a 220 volt, 50 hertz a.c. supply, the current is 0.5 amp, and is in same phase as the applied voltage. When another device Y is connected to the same supply, the electric current is again 0.5amp, but it leads the potential difference by pi//2 . When X and Y are connected in serices across the same source, what will be the current ?

An LCR-circuit is connected to a source of a.c. current under resonant condition. The phase difference between the applied voltage and the current it the circuit is