94
Impedance (Z) and Admittance (Y)
The impedance covers oppositions in AC circuits including resistance,
inductance, and capacitance and is measured in units of Ohm (
Ω).
In electrical engineering, admittance covers both conductance and
susceptance and is the reciprocal of impedance. It is measured in units of
Siemens (S).
Impedance (Z):
Relevant Equations
:
sin
cos
1
2
2
2
2
Z
X
Z
R
X
R
RX
Z
X
R
Z
C
j
R
L
j
R
jX
R
Z
Y
I
E
Z
s
s
p
s
s
Admittance (Y):
Relevant Equations
:
sin
cos
1
2
2
2
2
Y
B
Y
G
B
G
Y
B
G
GB
Y
L
j
G
C
j
G
jB
G
Y
Z
E
I
Y
p
p
p
s
p