Fundamentals of Electric Circuits

Review Questions 113
4. A supermesh consists of two meshes that have a (dependent or
independent) current source in common.
5. Nodal analysis is normally used when a circuit has fewer node
equations than mesh equations. Mesh analysis is normally used
when a circuit has fewer mesh equations than node equations.
6. Circuit analysis can be carried out using PSpice.
7. DC transistor circuits can be analyzed using the techniques covered
in this chapter.
Review Questions
3.1 At node 1 in the circuit of Fig. 3.46, applying KCL
gives:
(a) 2 12 v 1
3
(b) 2 v 1 12
3
(c) 2 12 v 1
3
(d) 2 v 1 12
3
v 1
6 v 1 v 2
4
v 1
6 v 2 v 1
4
0 v 1
6
0 v 1
6
v 1 v 2
4
v 2 v 1
4
3.3 For the circuit in Fig. 3.47, v 1 and v 2 are related as:
(a) v 1 6i 8 v 2 (b) v 1 6i 8 v 2
(c) v 1 6i 8 v 2 (d) v 1 6i 8 v 2
v 1
6 Ω
8 V
12 V + i
− 4 Ω
Figure 3.47
For Review Questions 3.3 and 3.4.
− +
v 2
12 V + −
2 A
8 Ω
3 Ω v 1 4 Ω
1 2
v 2
6 Ω 6 Ω
3.4 In the circuit of Fig. 3.47, the voltage is:
(a) 8 V (b) 1.6 V
(c) 1.6 V
(d) 8 V
3.5 The current i in the circuit of Fig. 3.48 is:
(a) 2.667 A (b) 0.667 A
(c) 0.667 A
(d) 2.667 A
v 2
Figure 3.46
For Review Questions 3.1 and 3.2.
3.2 In the circuit of Fig. 3.46, applying KCL at node 2
gives:
v 2 v 1
(a)
4
v 1 v 2
(b)
4
v 1 v 2
(c)
4
(d) v 2 v 1
4
v 2
8 v 2
6
v 2
8 v 2
6
12 v 2
8
v 2 12
8
v 2
6
v 2
6
4 Ω
10 V + − i
+ − 6 V
2 Ω
Figure 3.48
For Review Questions 3.5 and 3.6.
3.6 The loop equation for the circuit in Fig. 3.48 is:
(a) 10 4i 6 2i 0
(b) 10 4i 6 2i 0
(c) 10 4i 6 2i 0
(d) 10 4i 6 2i 0