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In electrical engineering, the admittance (Y) is the inverse or reciprocal of the impedance (Z). The SI unit of Admittance is the siemens.
- <math>Y = Z^{-1} = 1/Z \,<math>
where
Y is the admittance, measured in siemens
Z is the impedance, measured in ohms
Just as impedance is complex resistance, and the conductance G is the inverse G = 1/R of resistance R, admittance is also complex conductance.
Likewise, admittance is made up of a real part (the conductance), and an imaginary part (the susceptance B), shown by the equation
- <math>Y = G + j B \,<math>
The magnitude of admittance is given by:
- <math>\left | Y \right | = \sqrt {G^2 + B^2} \,\!<math>
where
G is the conductance, measured in siemens
B is the susceptance, measured in siemens
SI electricity units
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