Solution
Figure 4.7-1b shows the circuit after replacing the voltmeter by an equivalent open circuit and labeling the
voltage, Vm, measured by the voltmeter. Figure 4.7-1c shows the circuit after numbering the meshes. Let i1 and i2
denote the mesh currents in meshes 1 and 2, respectively.
The controlling current of the dependent source, ia, is the current in a short circuit. This short circuit is
common to meshes 1 and 2. The short-circuit current can be expressed in terms of the mesh currents as
ia = i1 - i2
The dependent source is in only one mesh, mesh 2. The reference direction of the dependent source current does
not agree with the reference direction of i2. Consequently,
5ia = -i2
Solving for i2 gives
i2 = - 5ia = — 5 (i1 — i2)
Therefore, - 4 i2 = -5 z , =► i2 = 5i1/4
Apply KVL to mesh 1 to get
32i1 — 24 = 0 => i1 = 3/4 A
Consequently, the value of i2 is
Apply KVL to mesh 2 to get