is the Imaginary Part of Electrical Impedance , a measure of opposition to a Sinusoidal Alternating Current . Reactance arises from the presence of Inductance and Capacitance within a circuit, and is denoted by the symbol , the SI Unit is the Ohm .
Both reactance and resistance are required to determine the impedance ; although in some circumstances the reactance may dominate the impedance, at least an approximate knowledge of the resistance is required to establish this.
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For a reactive component the sinusoidal voltage across the component is in quadrature (a
phase difference) with the sinusoidal current through the component. The component alternately absorbs energy from the circuit and then returns energy to the circuit, thus a pure reactance does not dissipate power.
# Pohl R. W. ''Elektrizitätslehre.'' – Berlin-Gottingen-Heidelberg: Springer-Verlag, 1960.
# Popov V. P. ''The Principles of Theory of Circuits.'' – M.: Higher School, 1985, 496 p. (In Russian).
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Küpfmüller K. ''Einführung in die theoretische Elektrotechnik,'' Springer-Verlag, 1959.
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