The toroidal cores (Amidon is one of the major manufacturers) have extensive application in radio frequency circuits and power supplies. The factor of merit (or quality) expressed with the letter Q is the ratio of the reactance (inductive in this case) and the sum of all the losses associated with the decrease in energy in transit Air Core Calculator Program The ballast is an electrical resistance element that offers to the passage of an alternating current having a certain frequency. L ‘inductance is the ability to store electrical energy in an electromagnetic field. The coil has an inductance ( expressed in Henry and submultiples – “L”), a ballast to the passage of alternating current (expressed in Ohms – “X”), a resistance to the passage of direct current (“R” – in Ohms), a factor of merit.
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