a dimensionless unit and is expressed as Q=X/R. From Figure-5, you
can see that Q is the tangent of the angle
θ.
Q is commonly applied to
inductors; for capacitors the term more often used to express purity is
dissipation factor (D). This D quantity is simply the reciprocal of Q. It is
the tangent of the complementary angle of
θ
.
Figure- 5. Relationships between resistance and reactance
6