# Explanation some technical terms for magnetic component(4)

Number turns
The series impedance of a high frequency ferrite device can be increased by running two or more turns of the treated conductor through the ferrites core, magnetic theory predicts that the impedance of the device will increase with the square of the number of turns, however, due to the lossy and non-linear nature of EMI suppression ferrits,aferrite bead with wo turns will yield somewhat less than four times the impedance of an identical part wound with only one turn of the conductor.

DCR(DC resistance)
The resistance of the inductor winding measured with no alternating current, the DCR is most often minimized in the design of an iductor, the unit if measure is ohms,and it is usually specified as a maximum rating.​

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