Figure 23.
Voltage across a capacitor in an ac circuit.
capacitive reactance, and give it a symbol XC.
If the input frequency is varied
from low to high, it will be found that XC decreases with an increase in frequency.
If the frequency remains constant and capacitance is increased, XC will decrease.
(1) The unit of measure of capacitance is the farad (f).
Values of
capacitance are usually given in terms of microfarads (uf) and
picofarads (pf).
10-6
(a) 1 microfarad
=
1/1,000,000
farad
=
0.000,001
farad
=
1
x
farads.
308
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