ELEC 225, Fall 2011
Prof. Rich Kozick

Homework 3


Date Assigned: Wednesday, September 7, 2011
Date Due: Wednesday, September 14, 2011

  1. Reading: In the Ulaby/Maharbiz text, please study Chapter 3, with emphasis on Section 3-1, the node-voltage method. The node-voltage method is very general and it can be used to analyze any circuit. Also, please begin studying Section 3-2 on the mesh-current method, and read Section 3-3 (but we will not discuss or explicitly use the material from Section 3-3).

  2. We will have Lab 1 on Thursday, Sept. 8 15 and Lab 2 on Sept. 15 22 (changed due to closure of campus on Sept. 8). Please bring your textbook, class notes, and breadboard to all lab sessions.

  3. I suggest that you install the Multisim 11 software that came with the textbook on your computer, and run through the examples in Section 2-8. Nothing needs to be submitted, but work through the examples to become familiar with the software. Please note the similarities and differences between Multisim and the PSpice software (by OrCAD) that we use in the lab. (We will simulate the voltage divider circuit in Section 2-8 in Lab 1.)

    You may want to become familiar with both versions of PSpice (Multisim and OrCAD). The OrCAD version will be used in lab and in your future courses, while Multisim will be available on your own computer. You will always be free to use either OrCAD or Multisim for assignments in this course.

  4. Please complete the survey on Moodle titled "Background in matrix math and solving simultaneous equations" by 12 noon on Monday, September 12.

  5. Please solve the following problems in Chapter 2 of the textbook and submit solutions in class on Wednesday, Sept. 14.
    Problems 2.30,
    2.38: Solve first using Ohm's Law, KCL, and KVL to find V0 = 11.8 V. Then solve again with V0 = 11.8 V given and find that Vout = 0.2 V using source transformations.
    2.39, 2.40, 2.42, 2.47 (look for a Y with equal resistors), and
    2.46: Solve first using Y-Delta transformations. Then look for a "balance bridge" and see if you can solve it more simply (that is, are some of the resistors in series with the balanced bridge?).
Thank you.