ELEC 226, Spring 2009
Prof. Rich Kozick

Homework 5


Date Assigned: Wednesday, February 11, 2009
Date Due: Wednesday, February 18, 2009

  1. Exam 1 will be on Monday, February 23. The exam topics will include Chapter 9 (sinusoidal steady-state circuit analysis) with emphasis on Sections 9.10 and 9.11 (transformers) and Chapter 10 (sinusoidal steady-state power), Sections 10.1 through 10.5 (not maximum power transfer in Section 10.6). The exam will be closed-book and closed-notes, but you can bring your calculator and one piece of 8.5" by 11" paper with notes and formulas. You can write on both sides of the paper, if you would like.

  2. Reading: In the Nilsson/Riedel text, please continue to study Chapter 10.
    You may also find it interesting to read Chapter 11 on three-phase circuits. We will not discuss much (if any) of Chapter 11 in class, but you will study this topic in a senior course, ELEC 491.

    After Exam 1, we will begin studying Chapters 7 and 8. Please review Chapter 6 and begin reading Chapter 7, Sections 7.1 and 7.2, for class on February 25.

  3. Please solve the following problems in Chapter 10 and submit solutions in class on Feb. 18:
    Problems 10.4 and 10.6: For these problems, find the relevant voltage and current phasors, then apply equations (10.2), (10.3), and (10.10) to compute the average power, P.
    Problems 10.8, 10.13, 10.16: For problems 8 and 16, equations (10.33), (10.36) for P and (10.34), (10.37) for Q are useful when computing the complex power for an impedance as in Figure 10.12.
    Problems 10.42, 10.49, 10.61: Moved to Homework 6.

  4. We will have a short quiz on the topic of ideal transformers in class on Wednesday, Feb. 18. The quiz will use the "step-up" and "step-down" transformers that we discussed in Lab 3 on Feb. 12 to minimize the power lost in the wires that transmit power over long distances.
Thank you.