Figure- 3. Expression of series and parallel combination
Reactance takes two forms - inductive (X
L
) and capacitive (Xc). By
definition, X
L
=2
π
fL and Xc=1/(2
π
fC), where f is the frequency of interest,
L is inductance, and C is capacitance. 2
π
f can be substituted for by the
angular frequency (
ω
:omega) to represent X
L
=
ω
L and Xc=1/(
ω
C). Refer
to Figure-4.
Figure- 4. Reactance in two forms - XL and Xc
Figure-5 shows a typical representation for a resistance and a
reactance connected in series. The quality factor (Q) serves as a
measure of a reactance’s purity (how close it is to being a pure
reactance, no resistance), and is defined as the ratio of the energy
stored in a component to the energy dissipated by the component. Q is
5