1. KCIDE
A Major Research
Project with
NASA-Glenn

2. A Knowledge Capturing Integrated Design Environment
KCIDE
A Knowledge Capturing Integrated Design Environment

3. Capturing Design Environment
A Knowledge
Capturing Design Environment
for a Course in
Electrical Circuits

4. KCIDE for Electrical Circuits
A platform that runs on top of Windows
Integrates PSpice, MATLAB, Excel, Word, and PowerPoint
Captures knowledge

5. Based on the Systems Approach to Problem Solving
The six step process as presented in Alexander and Sadiku

6. Six Steps
Define
Present
Alternate Solutions

7. Six Steps
Attempt
Evaluate
Rework/Export

32. Electric Circuits IDE
Problem Name: Example 03-02
Date: 6/9/2005

33. Problem Statement
We are to determine the node voltages in the following circuit. In addition, we are to find them using nodal analysis.

34. Define

35. Your Analysis on the Problem
We are to solve for the node voltages in the circuit using nodal analysis. We label the voltages as v1 representing the unknown node voltage at the top of the current source. The unknown node voltage between the 2-ohm and 8-ohm resistors we will label as v2. The unknown node voltage at the top of the dependent source we will label as v3. Please note that the number of nodes represent all the nodes excluding the reference node.

36. Present Number of Nodes in the circuit are 3
Number of Loops in the loops are 3
Let Node Voltage at Node 1 be v1 V
Let Node Voltage at Node 2 be v2 V
Let Node Voltage at Node 3 be v3 V
Let Loop Current in Loop 1 be i1 A
Let Loop Current in Loop 2 be i2 A
Let Loop Current in Loop 3 be i3 A

37. ALTERNATE SOLUTIONS The Methods Selected for Solving the Problem are:
Ohms Law
Nodal Analysis(KCL)
The Reasons for Selecting the Methods are:
Stated in problem definition

38. Attempt Intermediate steps: 0.75*v1-0.5*v2-0.25*v3=3
We could have also included any comments here that could show how we get the above equations.

39. ATTEMPT-II
Final Answers:
v1 = 4.8
v2 = 2.4
v3 = -2.4

40. Evaluate

41. Comments
We have successfully completed the assignment. The answers obtained from two different approaches agree. We should also go back to the circuit and see if the answers make sense. If they do not, my suggestion would be to try to solve for the loop currents by using mesh analysis and then solve for the node voltages using the loop currents. Another approach would be to use the node voltages to determine the branch currents and see if the satisfy Kirchhoff's current law. Looking at the original circuit, the answers do make sense.

42. KCIDE for Circuits
How to download the KCIDE for Circuits software from the web site:
IT IS FREE!!!!!!!

43. The Website: http://kcide.fennresearch.org

44.
Click Here

45. Click Here

46. Fill out the form and click Submit

47. After a short while, you will receive an email with download instructions.
Click on the link to complete the go to finish the downloads process.