Rationalised 2023-24
197
Alternating Current
4 An ac voltage v = vm sinwt applied to a capacitor drives a current in the
capacitor: i = im sin (wt + p/2) Here,
1
m,
m
C
C
v
i
X
X
ωC
=
=
 is called capacitive reactance The current through the capacitor is p/2 ahead of the applied voltage