Example
Determine the values of the mesh currents,
i
1
and
i
2,
for this circuit.
Solution
We can write one mesh equation by considering the current source. The current source current is
related to the mesh currents at by
12
1 2
1.5
1.5
ii
i i
−
=⇒
=
+
In order to write the second mesh equation, we must decide what to do about the current source
voltage. (Notice that there is no easy way to express the current source voltage in terms of the
mesh currents.)
In this example, illustrate two methods of writing the second mesh equation.
Method 1:
Assign a name to the current source voltage. Apply KVL to both of the meshes.
Eliminate the current source voltage from the KVL equations.
Here’s the circuit after labeling the current source voltage.
The KVL equation for mesh 1 is
1
91
2
iv
0
+
−=
The KVL equation for mesh 2 is
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 Spring '08
 gong
 Mesh Analysis, Current Source

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