# Inductive Reactance

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## inductive reactance

[in′dək·tiv rē′ak·təns]
(electricity)
Reactance due to the inductance of a coil or circuit.

## Reactance, Inductive

a quantity characterizing the opposition presented to an alternating current by the inductance of a circuit or of part of a circuit. Inductive reactance is measured in ohms.

In the case of a sinusoidal current, the inductive reactance xL can be expressed as the product ωL, where ω is the angular frequency of the current and L is the inductance of the circuit. Inductive reactance is equal to the ratio of the amplitude of the voltage applied to the terminals of the circuit and the amplitude of the current through the circuit if the circuit has an inductive character (that is, has little resistance and fairly large inductance); such a circuit can be regarded as equivalent to an inductance coil. When direct current is in the coil (ω = 0), the inductive reactance is equal to zero. When alternating current flows through the coil, electrical energy is transferred from the current source to the magnetic field of the coil and then back to the current source; the average power during a period is equal to zero.

References in periodicals archive ?
This improvement may be attributed due to the cancellation of feed strip capacitance by inductive reactance of tapered feed strip [14,17].
The Zst is a complex quantity that combines the material's DC surface resistance (Rs) and its surface inductive reactance (Xsl).
Conversely, at the higher band edge, the input impedance has an inductive reactance. By adding a parallel resonant circuit that has its resonant frequency occurring at the center of the operating frequency range in parallel with this circuit, the reactive part of the input impedance at both of the band edges can be canceled without having an effect on the impedance at the center frequency.
The choices between a capacitive and an inductive reactance at the lower and higher band edge impedances, for the input impedance and an inductive and a capacitive reactance at the lower and higher hand edge impedances, respectively, for the input impedance after the first step in the design process are determined mainly by the location of the original dispersive impedance on the Smith chart coupled with the desire to use a transmission line length that is as short as possible in step 1.
Thus, it follows from Equation 6 that the oscillations in the optimal microwave oscillator arise as a result of the capacitive reactance in the emitter circuit [Mathematical Expression Omitted], inductive reactance in the base circuit [Mathematical Expression Omitted], and inductive ([X.sub.L] [greater than] 0) or capacitive ([X.sub.L] [less than] 0) reactance in the collector circuit depending on the value of [Mathematical Expression Omitted].
It is interesting to observe that at upper frequencies, the active circuit shows very low inductive reactance, urging oscillation to occur at almost the resonance frequency of the resonator and thus leaving the frequency control function solely to the varactor.
Consequently, two frequency ranges exist where this resonator will have inductive reactance. The frequency of oscillation will be at a frequency where the summation of the resonator and the active circuit reactances is zero, that is, canceled.
The term quality factor was first used to describe the quality of a coil by relating its inductive reactance to its resistance.
In the case of the active loop antenna, the technique is only useful at frequencies below 30 MHz, where the loop's inductive reactance is not so large that it severely limits the short circuit current.
Although the junction capacitance was scaled by judicious diode selection, the inherent parasitic inductive reactance of the diode in series with its resistance in the ON state could not be compensated for with one diode.

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