Microtest 6363 - Page 16

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 Impedance (Z) and Admittance (Y):
Impedance is the general term of the obstructions of resistance, inductance, and capacitance
to the AC circuit; its unit is ohm(Ω).
Admittance is the general term of conductance and susceptance; admittance is defined as the
reciprocal of impedance in power electronics. Its unit is Siemens and it is abbreviated as (S).
 Impedance(Z)
Related Formula:
YI
E
Z
1

C
j
RLjRjXRZ
s




cos|| ZR
s


sin|| ZX
s

 Admittance(Y)
Related Formula:
ZE
I
Y
1

L
j
GCjGjBGY
p




cos||YG
p

 sin||YB
p

 
22
s
X R Z 
 
22
p
X R
RX
Z


 
22
s
B G
GB
Y


 
22
p
B G Y 