Example 2:
How much voltage must you apply across a
10μF capacitor to cause an AC current of
25mA at 50 Hz to flow

25mA at 50 Hz to flow
XC =
1 / 2 π f C
=
1 / 2 x 3.1416 x 50 x 10 x 10-6
=
318.5 Ω

Now, V
=
I XC
=
25 x 10-3 x 318.5
=
7.96 V

Example 3:
Using this example where the is a 10V AC
supply at 60 Hz applied to a simple capacitive
circuit with a 100 μF capacitor, let’s calculate
the current.

XC =1 / 2 π f C
=
/ 2 x 3.1416 x 60 x (100 x 10-6)
1
=
6.52 Ω
2

I
=
V / XC
=
10 / 26.52
=
0.3770 A