Basic Circuit Analysis, having difficulties

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Discussion Overview

The discussion revolves around a homework problem related to basic circuit analysis, specifically focusing on finding the voltage at a node (E1) using nodal analysis. Participants are sharing their attempts and seeking assistance with their calculations and methodologies.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant expresses difficulty in solving a problem using nodal analysis and notes a discrepancy between their result (Va = 10/4) and the professor's solution (42/3).
  • Another participant points out a potential misunderstanding regarding the symbols used in the problem, suggesting that the participant may have misinterpreted the notation.
  • A participant acknowledges their mistake after receiving feedback and expresses intent to reattempt the solution.
  • One participant mentions using conductivity (1/r) in their calculations but still arrives at an incorrect answer, indicating ongoing challenges with the problem.
  • A later reply offers validation of the new result from one participant, though it does not clarify whether this resolves the initial issue.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the correct approach or solution to the problem, as multiple participants express confusion and seek clarification on their calculations.

Contextual Notes

There are indications of missing assumptions or misunderstandings regarding circuit symbols and calculations, but these remain unresolved within the discussion.

Who May Find This Useful

Students and individuals seeking help with basic circuit analysis, particularly those learning about nodal analysis and related concepts.

coachspoon
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Homework Statement



Hi, this is my first time posting so if there is any advice on how to make this post cleaner, please tell me! I've been stuck on a problem and I can't figure out what I'm doing wrong. I have attached the problem and the attempt at solving the problem below. I am supposed to find E1 using nodal analysis.

Homework Equations


In my work that I attached, I replaced the name E1 with node A. I also used a supernode between A and C.

The Attempt at a Solution


Homework Statement


I solved Va = 10/4, however the solution that my professor gave me says its supposed to be 42/3. Any help is appreciated!
 

Attachments

  • EE211#25.jpg
    EE211#25.jpg
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  • CAM00040.jpg
    CAM00040.jpg
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Last edited:
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Hi coachspoon! http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

Those upside-down Ω symbols don't mean Ohms!
 
Last edited by a moderator:
oh my goodness i didn't notice, I'm a bonehead haha! thank you! let me see if i can solve it properly now.
 
I have solved it using conductivity = 1/r. However, I am still getting an incorrect answer. Any help is appreciated!
 

Attachments

  • CAM00041.jpg
    CAM00041.jpg
    14.1 KB · Views: 505
coachspoon said:
I have solved it using conductivity = 1/r. However, I am still getting an incorrect answer. Any help is appreciated!

Your new result looks good to me.
 

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