Phase of current in L–C–R circuits :- (1) is in phase of potential (2) leading from the phase of potential (3) lagging from the phase of potential (4) Before resonance frequency, leading from the phase of potential & after resonance freq. lagging from the phase of potential.
Answers
ANSWER
The series RLC ciruit contains 3 elements, R, L and C connected in series connection.
Consider an AC source connected to the circuit with ω rad/s frequency.
Since we have L and C elements present in the circuit, they will offer some reactance depending on the freq.
Inductive reactance =X
L
=jω×L
Capacitive reactance =X
C
=
jw×C
1
R remains unchanged as it is not a reactive element.
Now depending upon the operating frequency of the circuit there can be three cases of operation-
X
L
>X
C
where the circuit will behave as an inductive circuit. Current flowing on the inductor will produce magnetic flux that have reverse direction with the source. When the current flowing at inductor is maximum, the voltage must be zero and vice versa. So the current is lagging 90 degrees from the voltage
X
C
>X
L
where the circuit will behave as a capacitive circuit. It has similar explanation with inductor but the current is leading 90 degrees from the voltage
X
L
=X
C
resonance condition.
So the phase of the source voltage and current can be anywhere from −90 to +90 degrees depending on element values and source frequency.
solution
I hope you are understand my solution