G. Rizzoni, Principles and Applications of Electrical Engineering
Problem solutions, Chapter 3
3.1
Chapter 3 Instructor Notes
Chapter 3 presents the principal topics in the analysis of resistive (DC) circuits.
The presentation
of node voltage and mesh current analysis is supported by several solved examples and drill exercises, with
emphasis placed on developing consistent solution methods, and on reinforcing the use of a systematic
approach.
The aim of this style of presentation, which is perhaps more detailed than usual in a textbook
written for a non-majors audience, is to develop good habits early on, with the hope that the orderly
approach presented in Chapter 3 will facilitate the discussion of AC and transient analysis in Chapters 4
and 5.
Make The Connection
sidebars (pp. 75-77) introduce analogies between electrical and thermal
circuit elements.
These analogies are encountered again in Chapter 5.
A brief discussion of the principle
of superposition precedes the discussion of Thèvenin and Norton equivalent circuits.
Again, the
presentation is rich in examples and drill exercises, because the concept of equivalent circuits will be
heavily exploited in the analysis of AC and transient circuits in later chapters.
The
Focus on Methodology
boxes (p.76 – Node Analysis; p. 86 – Mesh Analysis; pp. 103, 107, 111 – Equivalent Circuits) provide the
student with a systematic approach to the solution of all basic network analysis problems.
After a brief discussion of maximum power transfer, the chapter closes with a section on nonlinear
circuit elements and load-line analysis.
This section can be easily skipped in a survey course, and may be
picked up later, in conjunction with Chapter 9, if the instructor wishes to devote some attention to load-line
analysis of diode circuits.
Finally, those instructors who are used to introducing the op-amp as a circuit
element, will find that sections 8.1 and 8.2 can be covered together with Chapter 3, and that a good
complement of homework problems and exercises devoted to the analysis of the op-amp as a circuit
element is provided in Chapter 8.
The homework problems present a graded variety of circuit problems.
Since the aim of this
chapter is to teach solution techniques, there are relatively few problems devoted to applications.
We
should call the instructor's attention to the following end-of-chapter problems: 3.8 and 3.19 on the
Wheatstone bridge; 3.21, 3.22, 3.23,
on three-wire residential distribution service; 3.24, 3.25, 3.26 on AC
three-phase electrical distribution systems; 3.28-3.31 on fuses; 3.62-66 on various nonlinear resistance
devices.
Learning Objectives
1.
Compute the solution of circuits containing linear resistors and independent and
dependent sources using
node analysis
.
2.
Compute the solution of circuits containing linear resistors and independent and
dependent sources using
mesh analysis
.