Alternating Cur...

A virtual current of 4 A and 50 Hz flows in an ac circuit containing a coil. The power consumed in the coil is 240 W. If the virtual voltage across the coil is 100 V its inductance will be

A circuit draws 330 W from a 110 V, 60 Hz ac line. The power factor is 0.6 and the current lags the voltage. The capacitance of a series capacitor that will result in a power factor of unity is equal to

In the adjoining figure the impedance of the circuit will be

The figure shows variation of R, X_L and X_C with frequency f in a series L,C,R circuit. Then for what frequency point, the circuit is inductive

When an ac source of e.m.f. e = E₀ sin(100t) is connected across a circuit, the phase difference between the e.m.f. e and the current iin the circuit is observed to be π/4, as shown in the diagram. If the circuit consists possibly only of RC or LC in series, find the relationship between the two elements

A bulb and a capacitor are in series with an ac source. On increasing frequency how will glow of the bulb change

What is the r.m.s. value of an alternating current which when passed through a resistor produces heat which is thrice of that produced by a direct current of 2 amperes in the same resistor

In an LCR circuit R = 100 ohm. When capacitance C is removed, the current lags behind the voltage by π/3. When inductance L is removed, the current leads the voltage by π/3. The impedance of the circuit is

A group of electric lamps having a total power rating of 1000 watt is supplied by an ac voltage E = 200 sin(310t + 60° ). Then the r.m.s. value of the circuit current is