Explanation some technical terms for magnetic component(5)

Q value
The Q value of an inductor is a measure of the relative losses in an inductor, the Q is also knows as the "quality factor" and is technically defined as the ratio of inductive reactance to effective resistance and is represented by Q=XL/R=2pifL/R
Since XL and R are functions of frequency, the test frequency must be given when specifying Q,XL typically increased with frequency at a faster rate than Re at lower frequencies, and vice versa at high frequencies, this results in a bell shaped curve for Q vs frequency, R is mainly comprised of the DC resistance of the wire, the core losses and skin effect of the wire, based on the above formula, it can be shown that the Q is zero at the self resonant frequency since the inductance is zero of the point.​

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