Before starting this module, you should be able to:  When you complete this module, you should be able to: 

The equation for calculating the amount of capacitive
reactance in an ac circuit is given by: where: X_{C} = capacitive reactance in ohms 
This equation demonstrates
the relationship between capacitive reactance (X_{C}), the frequency (f) of the
waveform applied to the circuit, and the value of the capacitance (C). The amount of capacitive reactance (X_{C}) changes inversely with the applied frequency (f):
The amount of capacitive reactance (X_{C}) changes inversely with the value of capacitance (C):

What is the value of capacitive reactance for
a 10 nF capacitor operating in a 200 kHz circuit? Ans: 79.6 W 
Hints Use the basic form of the equation: 
What value of capacitance is required for
producing a capacitive reactance of Ans: 1.1 nF 
Hints Rearrange the basic equation:

At what frequency will the X_{C} of a
1 mF capacitor be
1.2 kW? Ans: 133 Hz 
Hints Rearrange the basic equation: 