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Problem 3.5
Apply nodal analysis to determine the voltage
V
R
in the circuit of
Fig. P3.5.
2
Ω
4
Ω
4
Ω
8 V
V
R
+
_
12 V
+
_
_
V
Figure P3.5:
Circuit for Problem 3.5.
Solution:
At node
V
:
V
−
12
4
+
V
2
+
V
−
8
4
=
0
,
which leads to
V
=
5 V
.
Hence,
V
R
=
12
−
V
=
12
−
5
=
7 V
.
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For the circuit in Fig. P3.8:
(a)
Determine
I
.
(b)
Determine the amount of power supplied by the voltage source.
(c)
How much influence does the 4A source have on the circuit to the left of the
3A source?
2
Ω
8
Ω
8
Ω
8
Ω
8
Ω
6 V
3 A
4 A
I
+
_
V
I
‘
Figure P3.8:
Circuit for Problem 3.8.
Solution: (a)
At node
V
:
V
−
6
2
+
V
8
+
V
8
+
3
=
0
,
which leads to
V
p
1
2
+
1
8
+
1
8
P
=
3
−
3
=
0
6
V
8
=
0
.
Hence,
V
=
0
,
and
I
=
V
8
=
0 also
.
(b)
I
′
=
V
−
6
2
=
0
−
6
2
=
−
3 A
.
P
=
VI
=
6
×
(
−
3
) =
−
18 W
(c)
None.
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This note was uploaded on 06/15/2011 for the course EE 302 taught by Professor Mccann during the Fall '06 term at University of Texas at Austin.
 Fall '06
 MCCANN
 Electrical Engineering, Volt

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