Node Method Problem: Identifying Errors

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Homework Help Overview

The discussion revolves around a problem involving the node method in circuit analysis, particularly focusing on identifying errors in calculations related to voltage and resistance.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to verify their calculations for a1 and a2 while expressing uncertainty about b1. They question where to start in identifying the error in their approach.

Discussion Status

Participants are engaging in a dialogue about the clarity of the original poster's work, with some suggesting improvements in presentation. There is a mention of applying the superposition principle, indicating a potential direction for analysis.

Contextual Notes

There are constraints regarding the format of the original poster's work, as some parts are presented as handwritten images, which complicates the discussion. Participants express a preference for typed text for clarity.

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Homework Statement


upload_2015-1-19_16-38-8.png

upload_2015-1-19_16-38-34.png


Homework Equations



V=IR

The Attempt at a Solution



upload_2015-1-19_16-39-3.png

upload_2015-1-19_16-39-22.png


I believe my a1 and a2 are correct.

But my b1 is definitely wrong. Even if I carry out the above subtraction for the v1 part (which gives you b1) I will not have somethign as simple as R2 + R3 on the numerator
upload_2015-1-19_16-40-30.png

[/B]

Where would be some starting places to pinpoint the error?
 

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I'll try putting in dark blue.

Is this any easier to read?

I cannot change some of the below because some of it is pasted images

upload_2015-1-19_16-43-19.png
upload_2015-1-19_16-43-38.png
 
You're not supposed to post working as handwritten images. It's hard to read and hard to reference when making comments.
Given the answer for a1, please post your working to obtain b1 in typed text - preferably LaTeX, or using subscripts, but that's not essential.
 
This is a good time to apply the superposition principle.
 

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