Circuit Analysis - Source Transformation

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Homework Help Overview

The discussion revolves around circuit analysis, specifically focusing on source transformation and the combination of current sources and resistors in a circuit. The original poster expresses confusion regarding their calculations and seeks assistance in identifying errors in their approach.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the validity of the original poster's steps, particularly questioning the treatment of current sources and the combination of resistors. There is a focus on whether the currents should be added or subtracted based on their directions.

Discussion Status

Participants are actively engaging with the original poster's work, providing hints and prompting them to reconsider their approach to combining current sources. There is an exploration of different interpretations regarding the direction of currents and how they affect the analysis.

Contextual Notes

There is an indication that the original poster's calculations may be based on incorrect assumptions about the direction of current flow, which is a critical aspect of circuit analysis. The discussion reflects a collaborative effort to clarify these assumptions without reaching a definitive conclusion.

jisbon
Messages
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Reaction score
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Homework Statement
Analyze using the hints given.
Relevant Equations
-
My work seems to be wrong somehow since my answer is wrong, and I need your help to find out which part is going wrong for me :/

1586413661010.png


My work:

1.
1586413876565.png

2.
1586414154627.png

3.
1586414221198.png

4.
1586414285433.png

5.
1586414335914.png

6.
1586414382558.png
(10/7)/(10/7+7) = 0.7627A, which is not the answer.

May I consult where is the problem in solution? THanks
 
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OK up to step 5. Look at the current sources again.
 
As in
DaveE said:
OK up to step 5. Look at the current sources again.
As in there's a problem with step 5? Shouldn't I combine the resistors in parallel?
 
OK step 4 then. Think about how you combine two current sources into 1. Once you have a network where everything is in parallel, you are free to redraw your schematic with any ordering of the components that you like. It may help if you draw it with all of the current sources together and then simplify.
 
jisbon said:
Homework Statement:: Analyze using the hints given.
Relevant Equations:: -

My work seems to be wrong somehow since my answer is wrong, and I need your help to find out which part is going wrong for me :/
My work:

1.

2.

3.

4.
View attachment 260284
5.
View attachment 260285
6.
(10/7)/(10/7+7) = 0.7627A, which is not the answer.

May I consult where is the problem in solution? THanks
why did you subtract the currents supplied by the two sources?
 
ehild said:
why did you subtract the currents supplied by the two sources?
Because they were going in different directions? Am I supposed to add theminstead?
 
jisbon said:
Because they were going in different directions? Am I supposed to add theminstead?
Replace the three parallel resistors with their resultant- In what
direction do the currents flow through this resistor?
1586513902289.png
 
Last edited:
Oh, they re going in the same direction ..:/
 
jisbon said:
Oh, they re going in the same direction ..:/
Yes! They both feed current into the same circuit node, so they add when combined into one source.
 

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