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The imaginary part of the admittance of an alternating-current circuit.

The admittance, Y, of an alternating current circuit is a complex number given by Eq. (1). The imaginary part, B, is the susceptance.

The units of susceptance like those of admittance are called siemens or mhos. Susceptance may be either positive or negative. For example, the admittance of a capacitor C at frequency &ohgr; is given by Eq. (2), and so B is positive. For an inductor L, the admittance is given by Eq. (3), and so B is negative. (2)  (3) 

In general, the susceptance of a circuit may depend on the resistors as well as the capacitors and inductors. For example, the circuit in the illustration has impedance given by Eq. (4) and admittance given by Eq. (5), so that the susceptance, given by Eq. (6), depends on the resistor R as well as the inductor L. (4)  (5)  (6)  See Admittance, Electrical impedance

Circuit with a resistor and inductor in seriesenlarge picture
Circuit with a resistor and inductor in series
McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.


The imaginary component of admittance.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
By using nth harmonic balanced conductance and nth harmonic balanced susceptance parameters, the balanced current component can be expressed as;
10 indicates that the RTD susceptance varies linearly with the frequency and therefore it can be approximated by a frequency independent capacitor as in [13].
The interpolation is applied to the susceptance [b.sub.p] in the same range, yielding []([omega]) = -1.5 + 2.33(-0.5 + [omega]).
C is the capacitance between the microstrip feed line and the patch elements, and gr and br are the patch end radiation conductance and susceptance, respectively.
where the conductance (G), which is the real part of the admittance, is due to the current through the contact resistor, and the susceptance (B), which is the imaginary part of the admittance, is due to the current through the contact capacitor.
Multifrequency tympanometry (MFT) consist of the analysis of tympanograms of different probe tones between 226 and 2000 Hz and measures individual vectors of complex admittance (Y), namely susceptance (B) and conductance (G) [1].