Alternating Current questions
577 published questions with worked solutions.
- An inductor stores 16 J of magnetic field energy and dissipates 32 W of thermal energy due to its resistance when an a.c. current...
- In a series LCR circuit, a resistor of 300 , a capacitor of 25 nF and an inductor of 100 mH are used. For maximum current in the...
- An alternating current is given by I = I_A t + I_B t. The r.m.s. current will be : -
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Choke...
- An electric bulb rated as 100W – 220 V is connected to an ac source of rms voltage 220 V. The peak value of current through the...
- An alternating current is represented by the equation, i = 100 2 (100 t) ampere. The RMS value of current and the frequency of...
- An inductor of self inductance 1 H is connected in series with a resistor of 100 ohm and an ac supply of 100 volt, 50 Hz. Maximum...
- An inductor of reactance 100 Ω, a capacitor of reactance 50 Ω, and a resistor of resistance 50 Ω are connected in series with an...
- An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the...
- In an a.c. circuit, the instantaneous e.m.f. and current are given by e = 100 30t, i = 20 (30t - 4 ) In one cycle of a.c., the...
- A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns,...
- An alternating voltage V(t) = 220 100 t volt is applied to a purely resistive load of 50 Ω. The time taken for the current to...
- A circuit connected to an ac source of emf e = e_0 (100t) with t in seconds, gives a phase difference of 4 between the emf e and...
- A transformer consisting of 300 turns in the primary and 150 turns in the secondary gives output power of 2.2 kW. If the current...
- A series AC circuit containing an inductor (20 mH), a capacitor (120 μF) and a resistor (60 Ω) is driven by an AC source of 24...
- A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. The...
- A transformer has an efficiency of 80% and works at 10 V and 4 kW. If the secondary voltage is 240 V, then the current in the...
- In series LCR circuit, the capacitance is changed from C to 4C. To keep the resonance frequency unchanged, the new inductance...
- In an ac circuit, the instantaneous current is zero, when the instantaneous voltage is maximum. In this case, the source may be...
- A alternating current at any instant is given by i = [6 + 56 (100 t + 3 ) ] A. The rms value of the current is ________ A.
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