Lecture S8
Muddiest Points
General
Comments
In today’s lecture,
we began
learning
about
capacitive circuits. We did
a
concept
test
that
emphasized the rule that capacitors
resist
voltage change, and
began
learning
how to
write the
differential
equations
of
circuits
with
capacitors. We also
learned
that
capacitors can
be treated a
little like resistors
—
a
capacitor
has
a
conductance (more properly
called
an
admittance
), and we
can use it
just like a
conductance when we do
the node method.
There we only
39
cards
today.
Please,
I
would
like everyone to
particpate in
the
muddiestpartofthelecture exercise.
Responses
to MuddiestPartoftheLecture
Cards
(39
cards)
1.
Stil l don’t understand how
to find
node equations
“by inspection.”
(4
students)
At
any node (say,
e
1
),
the left hand side of the node equation
is the sum
of the
conductances
touching
e
1
times
e
1
, minus the conductance connecting
e
1
to
e
2
times
e
2
,
minus the conductance connecting
e
1
to
e
3
times
e
3
, . . . The right
hand
side of the node
equation
is
the sum of
current sources ﬂowing
into
e
1
. (Note: I
have assumed
that
there
are
no
voltage sources
attached
to
e
1
. If there is, either the node voltage is known
at
e
1
, and
there is
no
need
to
write KCL at
that
node, or
e
1
is part
of a
supernode, and
the rule is
more complicated.)
2.
Why is
a bandpass
filter
called
a
bandpass
filter?
What
does
it
do?
(2)
It
is
common
to
think
about filters
in
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 Fall '05
 MarkDrela
 Resistor, Electrical impedance, bandpass filter

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