In an experiment, 200 V AC is applied at the ends of an LCR circuit. The circuit consists of an inductive reactance (X_L) = 50 Ω, capacitive reactance (X_C) = 50 Ω and ohmic resistance (R) = 10 Ω. The impedance of the circuit is 

A 12 Ω resistor and a 0.21 H inductor are connected in series to an a.c. source operating at 20 V, 50 Hz. The phase angle between the current and source voltage is :

In an a.c. circuit, the current is i = 5 sin (100t -π/2) amp and the a.c. voltage is v = 200 sin (100 t) volts. Then power consumption is

In an AC circuit, V and I are given by 

             V = 100 sin (100 t) volt

and        I = 100 sin (100 t + π/3) amp

The power dissipated in the circuit is

Energy needed to establish an alternating current I in a coil of self inductance L is

An alternating voltage E = 220√2 sin 100 t is connected to 1μF capacitor through an a.c. ammeter. The reading of the ammeter shall be :

The reactance of a capacitor of capacitance C is X. If both the freqauency and capacitance be doubled, then new reactance will be

Hot wire ammeters are used for measuring

In an AC circuit with voltage V and current i the power dissipated is

An alternating voltage (in volts) given by

             V = 200 √2 sin (100 t), is connected to a 1 μF capacitor through an AC ammeter. The reading of the ammeter will be