For a series LCR circuit, the power loss at resonance is :
Which of the following combination should be selected for better turning of an L.C.R circuit used for communication?
An ac voltage is applied to a resistance R and an inductor L in series. If R and the inductive reactance are both equal to 3Ω, the phase difference between the applied voltage and the current in the circuit is
A series R-C circuit is connected to an alternating voltage source. Consider two situation:
(a) When capacitor is filled
(b) When capacitor is mica filled
Current through resister is i and voltage across capacitor is V then :
The instantaneous values of alternating current and voltages in a circuit are given as
i =21sin(100 πt) ampere
e =21 sin(100 πt + π/3) volt
The average power in Watts consumed in the circuit is:
Power dissipated in an LCR series circuit connected to an a.c. source of emf ε is :
A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes 'Z', the power drawn will be
The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is:
A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source of 200 volt, 100 Hz is connected across the coil, the current in the coil will be :
A small signal voltage V(t)=V0 sinωt is applied across an ideal capacitor C. Then:
