whatis mean by susceptance
I guess you are pretty familiar with impedence, but you aint sure why you need its reciprocal admittance, am I right?
Just to set the record straight,impedence is just the ratio of voltage against current. Don't think too complicated. So it's just a value that describes the V-I characteristics of an element or a circuit. For linear elements, it is complex in general, and probably a function of frequency. You can always find the DC impedence (ie resistance) by substituting freq=0.
Well, it's easy to compute net impedence of elements in series. You simply add them togather.
Correspondingly, it's easy to compute admittance of elements in parallel. You simply add them togather!
And since you know that impedence and admittance are reciprocally related, you can easily convert from one form to the other, and that gives you an easy method to compute net impedence/admittance of a more complicated circuit.
The net impedence of HF circuits use this concept, with the aid of the smith chart, to allow easy addition/multiplication/reciprocation of phasors.
Resistance/Conductance/Reactance/Susceptance are just the real and imaginary parts. You shouldn't bother much about those, and concentrate on the the more important impedence/admittance values as these are the generalized versions.