Before revision: Formula The general equation defining admittance is given by where The admittance () is the reciprocal of the impedance (), if the impedance is not zero: and where The susceptance is the imaginary part of the admittance The magnitude of admittance is given by: And similar formulas transform admittance into impedance, hence susceptance () into reactance (): hence The reactance and susceptance are only reciprocals in the absence of either resistance or conductance (only if either or , either of which implies the other, if or equivalently ).
After revision: Formula The general equation defining admittance is given by where The admittance () is the reciprocal of the impedance (), if the impedance is not zero: and where The susceptance is the imaginary part of the admittance The magnitude of admittance is given by: And similar formulas transform admittance into impedance, hence susceptance () into reactance (): hence The reactance and susceptance are only reciprocals in the absence of either resistance or conductance (only if either or , either of which implies the other, as long as , or equivalently as long as ).