Example 4.4-2
Determine the node voltages for the circuit shown in Figure 4.4-2.
Solution
The controlling voltage of the dependent source is Vx. Our first task
is to express this voltage as a function of the node voltages:
Vx = - Va
The difference between the node voltages at nodes a and b is set
by voltage of the dependent source:
Va - Vb = 4Vx = 4(—Va) = - 4Va
Simplifying this equation gives
Vb = 5 Va
Applying KCL to the supemode corresponding to the dependent voltage source gives
-
Using Eq. 4.4-3 to eliminate Vb, from Eq. 4.4-4 gives
Solving for Va, we get
Va = 4 V
Finally,
Vb = 5Va = 20V