what is reactance?

Answer 1

Reactance, measured in ohm's, is the term for frequency differences between voltage and current in an alternating circuit. Reactance is present in some form or another in almost every circuit. It is resistive to current flow in a similar manner as Resistance. The combined resistive effect on current flow including Reactance is impedance and is measured in ohm's. Thus, the same formula E=IR can be used for calculations having impedance.

Answer 2

"In the analysis of an alternating-current electrical circuit (for example a RLC series circuit), reactance is the imaginary part of impedance, and is caused by the presence of inductors or capacitors in the circuit. Reactance produces a phase shift between the electric current and voltage in the circuit. Reactance is denoted by the symbol X and is measured in ohms."

Answer 3

Reactance is an unreal version of resistance. It is the component of a resonant circuit which becomes apparant due to frequency and the time-constant of the circuit. It is typical among capacitors and inductors.

Answer 4

In simple terms, reactance is part of Impedance of an electric circuit where current I flows due to voltage V. Impedance (designated generally by Z) is given by

Z = R + jXL - jXC

Thus reactance may be due to Inductance L (inductive reactance) or Capacitance C (capacitive reactance). Units are also ohms, like Resistance R.

In case of pure R, I and V both are in phase. In case of reactance there is lag for L and lead for C. For L, the lag is 90deg and for C, the lead is 90deg.

How these come into play? Just understand that in case of L, there is opposition to the flow of current (conventional current owing to moving electrons). In case of C, there is facilitation in the flow of current (owing to jumping across plates of capacitor of current establishing electrons).

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