a circuit element's opposition to changes in electric current due to its inductance or capacitance
Electric reactance is the resistance that inductors and capacitors provide to changes in electric current flowing through a circuit. It matters because it affects how circuits respond to alternating current, determining how much the current and voltage get out of sync with each other.
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In electrical circuits, reactance is the opposition presented to alternating current by inductance and capacitance. It is measured in ohms. Along with resistance, it is one of two elements of impedance; however, while both elements involve transfer of electrical energy, no dissipation of electrical energy as heat occurs in reactance; instead, the reactance stores energy until a quarter-cycle later when the energy is returned to the circuit. Greater reactance gives smaller current for the same applied voltage.
Reactance is used to compute amplitude and phase changes of sinusoidal alternating current going through a circuit element. Like resistance, reactance is measured in ohms, with positive values indicating inductive reactance and negative indicating capacitive reactance. It is denoted by the symbol
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