An
inductor (coil) has the following basic characteristics, which is said to be an inductive reactance. \u2460 An
inductor passes a direct current with essentially no change. \u2461 An
inductor acts to impede an alternating current. \u2462 The
higher the
frequency, the harder it is for an alternating current to flow.
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At low frequency the reactance falls; at DC, the inductor behaves as a short circuit. As frequency increases the reactance increases and at a sufficiently high frequency the reactance approaches that of an open circuit.