Definition - What does Reactance mean?
Reactance is the opposition of circuit element to the change in voltage or current in electronic and electric systems. The change of voltage is resisted by built-up electric fields, whereas the change of current is resisted by magnetic fields. When current is passed through a component containing reactance, energy is stored and released from an electric or magnetic field. It is reactive in the case of a magnetic field and capacitive in the case of an electric field. It is represented by symbol 'X'.
Petropedia explains Reactance
Reactance is used for computing phase changes and amplitude of the current going through a circuit element. In an ideal resistor, zero reactance is observed while in an ideal capacitor and inductor, zero resistance is found, which is a response to the current by reactance only. In an inductor the magnitude of reactance rises in proportion to the rise in frequency, whereas in a capacitor the magnitude of reactance decreases in proportion with the rise in frequency. It can be said that when the frequency rises, inductive reactance also rises and the capacitive reactance drops.