The current through the capacitor is p/2 ahead of the applied voltage As in the case of inductor, the average power supplied to a capacitor
over one complete cycle is zero 5 For a series RLC circuit driven by voltage v = vm sin wt, the current is
given by i = im sin (wt + f)
where
(
)
2
2
m
m
C
L
v
i
R
X
X
=
+
−
and
tan1
C
L
X
X
R
φ
−
−
=
(
)
2
2
C
L
Z
R
X
X
=
+
−
 is called the impedance of the circuit