Is There an Error in My Kirchoff's Loop Problem Solution?

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Homework Help Overview

The discussion revolves around a circuit analysis problem involving Kirchhoff's laws, specifically focusing on finding the currents through various resistors. The original poster expresses uncertainty regarding their calculations compared to their professor's results.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to verify their calculated currents against their professor's values, questioning the accuracy of both their own and the professor's results. Some participants raise concerns about the absence of units in the original poster's answers, suggesting that this omission could lead to misinterpretation of the results.

Discussion Status

Participants are actively engaging in clarifying the calculations and addressing potential errors in the original poster's work. There is acknowledgment of the need for proper scientific notation, particularly regarding the magnitude of the current values. Guidance has been offered regarding the importance of units in calculations.

Contextual Notes

There is mention of the professor's reputation for making errors, which adds a layer of uncertainty to the discussion. The original poster also notes difficulties in presenting their work visually, which may affect the clarity of their problem setup.

mattwkeller
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Homework Statement


Find the currents going through each resistor.
media%2F2d8%2F2d84bb09-154d-41ef-a5d7-cc0215f3ad3a%2FphpMrLurv.png


Homework Equations



V=IR

The Attempt at a Solution


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media%2Fb0d%2Fb0da98b6-e7ee-454a-8e9e-b6c40181f50e%2FphpYUlKvm.png
I have the problem worked out and I can't find any errors in my work. The issue is that my professor has:

I1=-.0843
I2=.086
I3=.0017

However my physics professor is notorious to make errors in class and right sloppily, so I don't entirely trust his solutions. Can you find any error in my work/confirm my results? Sorry about the picture being sideways.
 
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Sorry, struggling getting the picture up...in the meantime my answers are:

I1=-8.461
I2=-.00392
I3=-.00477
 
image11_zps570405bb.jpg
 
Your answers are missing units, making it difficult to say whether they are numerically correct. You'd definitely lose marks though for not showing units.

Assuming your results are in Amps then I2 and I3 look to be correct numerically, but I1 is not... it's got the wrong order of magnitude. So check your calculation there.
 
Yes, sorry about that. They are in amps. I missed the scientific notation in my matrix. Should I1= -8.461e(-4)?
 
mattwkeller said:
Yes, sorry about that. They are in amps. I missed the scientific notation in my matrix. Should I1= -8.461e(-4)?
Yes, that's right.
 
Okay, thank you.
 

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