ELEC 225, Fall 2009
Prof. Rich Kozick

Homework 11


Date Assigned: Wednesday, November 18, 2009
Date Due: Monday, November 30, 2009 Wednesday, December 2, 2009

  1. Reading: In the Nilsson/Riedel text, please continue to study Chapter 9 on sinusoids, phasors, impedance, and circuit analysis. Begin with Sections 9.1-9.6, but eventually we will study the entire chapter. Also, review Appendix B on complex numbers.

    Chapter 9 provides a nice review of everything we've done so far in this course. We will be applying all of the circuit analysis methods to find the sinusoidal steady-state response, or how circuits behave when the voltages and currents change with time as a sine wave. The new twist is that voltages and currents will be complex-valued phasors, while resistors, capacitors, and inductors will be modeled by complex-valued impedances.

  2. We will perform Lab 6 on November 12 and 19, beginning at 8:10 AM. The class will be divided into the same two groups as for Lab 5.

  3. Please solve the following problems in Chapter 9 and submit solutions on November 30: December 2:
    Chapter 9: 5, 6, 7, 11, 12, 14.
    Hint for 9.6: cos2 x = (1 + cos (2x)) / 2

    Note: There is an error in the answer to Problems 9.5 (h) and (j) in the back of the textbook. The answers in the textbook are correct if the questions are changed as follows:
    9.5(h): Change "to the right" to "to the left"
    9.5(j): Change "to the left" to "to the right"
    The correct answers to the questions in the text are (h) 150 degrees and (j) 1/360 sec = 2.78 ms.

  4. An optional session for help with using your calculator to perform complex number computations will be held as follows:
    Tuesday, Dec. 1, 7-8 PM in Dana 305.

Thank you.