<P> An early solid - state electrical switching and amplifying device called a saturable reactor exploits saturation of the core as a means of stopping the inductive transfer of current via the core . </P> <P> The winding resistance appears as a resistance in series with the inductor; it is referred to as DCR (DC resistance). This resistance dissipates some of the reactive energy . The quality factor (or Q) of an inductor is the ratio of its inductive reactance to its resistance at a given frequency, and is a measure of its efficiency . The higher the Q factor of the inductor, the closer it approaches the behavior of an ideal inductor . High Q inductors are used with capacitors to make resonant circuits in radio transmitters and receivers . The higher the Q is, the narrower the bandwidth of the resonant circuit . </P> <P> The Q factor of an inductor is defined as, where L is the inductance, R is the DCR, ω is the radian operating frequency, and the product ωL is the inductive reactance: </P> <Dl> <Dd> Q = ω L R (\ displaystyle Q = (\ frac (\ omega L) (R))) </Dd> </Dl>

What is difference between ideal inductor and practical inductor