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The graph shows current v/s voltage in a series RLC A.C. circuit. The arrow indicates the direction that this curve is drawn as time progresses. In this plot, the
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Important Questions on Alternating Current
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An alternating emf of angular frequency is applied across an inductance. The instantaneous power developed in the circuit has an angular frequency:-
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The self-inductance of a choke coil is . When it is connected with a DC source, then the loss of power is . When it is connected with AC source, loss of power is . The frequency of AC source will be
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In the L-C circuit shown in figure, the current is in direction shown in the figure and charges on the capacitor plates have sign shown in the figure. At this time :-
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The inductance of the oscillatory circuit of a radio station is 10 milli henry and its capacitance is 0.25µF. Taking the effect of the resistance negligible, wavelength of the broadcasted waves will be (velocity of light = 3.0 × 108 m/s, = 3.14) :
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A coil has an inductance of and is joined in series with a resistance of . When the alternating emf of at is applied to it then the phase through which current lags behind the applied emf and the wattles component of current in the circuit will be respectively :
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When 100V D.C. is applied across a coil a current of 1A flows through it. When 100V A.C. of 50 Hz is applied to the same coil only 0.5A flows. The inductance of the coil is :-
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In the circuit shown in the figure, the A.C. source gives a voltage neglecting source resistance, the voltmeter and ammeter readings will be :
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Assertion : Soft iron is used !as transformer core.
Reason : Soft iron has narrow hysteresis loop.
