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In an LCR circuit, R=100 Ω. When capacitance C is removed, the current lags behind the voltage by π3. When inductance L is removed, the current leads the voltage by π3. The impedance of the circuit is,

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Important Questions on Alternating Current

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For the series LCR circuit shown in the figure, what is the resonance frequency and value of the current at the resonating frequency?

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Following figure shows an AC generator connected to a block box through a pair of terminals. The box contains possible R, L, C or their combination, whose elements and arrangements are not known to us.

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Measurements outside the box reveals that e=75sin(sinωt) Vi=1.5sinωt+45° A, then the wrong statement is

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A resistor R, an inductor L and a capacitor C are connected in series to an oscillator of frequency n. If the resonant frequency is nr, then the current lags behind voltage when
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The rms current in an AC circuit is 2 A. If the watt-less current is 3 A, then what is the power factor?
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2.5π μF capacitor and 3000 Ω resistance are joined in series to an ac source of 200 V and 50 s-1 frequency. The power factor of the circuit and the power dissipated in it will be, respectively,
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The self-inductance of a choke coil is 10 mH. When it is connected with a 10 V DC source, then the loss of power is 20 W. When it is connected with 10 V AC source, loss of power is 10 W. The frequency of AC source will be
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A group of electric lamps having a total power rating of 1000 W is supplied by an ac voltage E=200sin310t+60°. The r.m.s. value of the circuit current is
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In an LR circuit, the inductive reactance is equal to the resistance R of the circuit. An emf E=E0sinωt is applied to the circuit. The power consumed in the circuit is