RLC circuit 2
In the above diagram, a resistor with resistance
, a capacitor with capacitance
and two inductors with self-inductances
and
respectively, are connected to an AC power supply. The frequency of the AC power supply is
. Which of the following statements is correct?
a) When the switch
S
is connected to
A
, the impedance of the circuit is
.
b) When the switch
S
is connected to
A
, the voltages across the resistor and the capacitor have the same phase angle.
c) The RMS value of the current is smaller when the switch
S
is connected to
B
than when it is connected to
A
.
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
At resonance the impedance of the inductance is equal to the impedance of the capacitance. ie X L=X C ; X=2 x pi x frequency.When you do plug in the values of the variables you find out it is true.Hence since L and C are opposites of each other they cancel and the only impedance is R. Since the impedance has dropped to R the value of current increases hence its RMS value also increases. (i have explained it very poorly but do try to get the idea.)