in an AC circuit, the voltage across the coil (inductor) divided by the current through the coil; analogous to resistance in a DC circuit (see equation 21.19)

Opposition to the flow of AC current produced by an inductor. Measured in Ohms and varies in direct proportion to frequency.

A term used to describe the impedance to alternating current offered by an inductive circuit.

The opposition to alternating current flow presented by a capacitance. The symbol for capacitive reactance is XC. The unit is the ohm. The formula for capacitive reactance is XL = 2ðfL, where f is the frequency of the alternating current signal, and L is the inductance.

The opposition of an inductor to sinusoidal current. The unit is ohms.

The opposition that inductance offers to an alternating current. AC inductive reactance (XL) and a function of frequency (w) is given by: X = j w L , where j is an imaginary operator, w is the angular frequency, and L is the Inductance. See also Inductance.

The opposition to the flow of current in an ac circuit by the insertion of an inductance. It is measured in ohms.

The opposition to the flow of an alternating current caused by the inductance of a circuit, expressed in ohms. Identified by the symbol X L.