Power dissipated in an LCR series circuit connectedto an a,c source of emf ε is

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Q. Power dissipated in an LCR series circuit connected to an a.c. source of emf

ε

is :

Q. In a series LCR circuit connected to an a.c. source of voltage

v = v_{m} s i n ω t

, use phasor diagram to derive an expression for the current in the circuit. Hence, obtain the expression for the power dissipated in the circuit. Show that power dissipated at resonance is maximum.

Q. An LCR series circuit with 100 resistance is connected to an AC source of 200 V and angular frequency 300 radians per second. When only the capacitance is removed, the current leads the voltage by 60 . Then the current and power dissipated in LCR circuit are respectively :

Q. An

L C R

circuit has

L = 10 m H, R = 150 Ω

and

C = 1 μ F

connected in series to a source of

150 \sqrt{2} cos ω t

volt. At a frequency that is

50 %

of the resonant frequency, calculate the average power (in

w a t t

) dissipated per cycle.

The equal resistors connected in series across a source of emf together dissipate 5W of power. Of the same resistors are connected in parallel across the same source of emf , the power dissipated will be?

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