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Unit 2: Node and Mesh Circuit Analysis
Unit 2.4  Node Voltage Analysis
vs. Mesh Current Analysis
Solving Problems
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Since the first exam, we have introduced
two systematic techniques:
Node Voltage Analysis
allows you to assign
voltage values to each essential node once a
reference node is defined.
Mesh Current Analysis
allows you to assign
current values to all mesh currents in the
circuit.
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Now that we have these two tools which
one should I use?
Issue #1:
What circuit am I analyzing?
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In terms of the number of equations you
need to write out and solve, either node
voltage analysis or mesh current analysis
could be simpler to apply.
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How should I evaluate this?
You should spend about 6090 seconds on each
circuit and ask the following (called the
Quick
Inspection
):
• If I use node voltage analysis how many
equations do I have to solve?
• If I use mesh current analysis, how many
equations do I have to solve?
Example Circuit #1
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If I use node voltage analysis, how many equations
do I have to solve?
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I am left with 3 nodes for which I need to write a
KCL equations.
This means I have 3 equations and 3 unknowns
5 A
6
Ω
13
Ω
3
Ω
20 Ω
7
Ω
4
Ω
12 A
i
y
i
x
Example Circuit #1 Con’t
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If I use mesh current analysis, how many equations
do I have to solve?
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I am left with 4 meshes for which I need to write a
KVL equations
This means I have 4 equations and 4 unknowns
5 A
6
Ω
13
Ω
3
Ω
20 Ω
7
Ω
4
Ω
12 A
i
y
i
x
Example Circuit #2
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Which method would you use for this
circuit?
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 Fall '08
 WilliamNeal
 Volt, Mesh Analysis, SEPTA Regional Rail, Jaguar Racing, NODE VOLTAGE ANALYSIS, Mesh Circuit Analysis

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