58 Phasors in action

Ganago phasorsinaccon 12 2 102609 phaseshiks1

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Unformatted text preview: V
=
Z
I
 ©
2009
A.
Ganago
 Phasors
in
AcCon
 8
 Formulas
for
Impedances
(1)
 •  Impedance
ZR
of
a
resistor
equals
resistance
R
 and
does
not
depend
on
frequency
 •  For
a
capacitor:
ZC
=
1/(jωC),
where

j
=√(‐1)

 •  If
ω
is
in
rad/sec,
and
C
in
farads,
ZC
is
in
ohms
 •  For
example,
C
=
1.5
nF,
f
=
3
MHz;
note
that
 ω=2πf
=
1.885e7
rad/sec;
thus
ZC
=
‐j
35.37
Ω

 •  ZC
decreases
with
the
frequency
ω
 •  ZC
∞
when
ω
=
0;
ZC
0
when
ω
∞
 ©
2009
A.
Ganago
 Phasors
in
AcCon
 9
 Formulas
for
Impedances
(2)
 •  For
an
inductor:
ZL
=
jωL;

j
=√(‐1)
 •  If
ω
is
in
rad/sec,
and
C
in
farads,
ZC
is
in
ohms
 •  For
exampl...
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This note was uploaded on 12/06/2010 for the course EECS 314 taught by Professor Ganago during the Spring '07 term at University of Michigan.

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