Circuit analysis current source problem

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Homework Help Overview

The discussion revolves around a circuit analysis problem where participants are tasked with finding the voltage V1 in a given circuit involving multiple resistors and current sources. The subject area is circuit analysis, specifically focusing on the application of the superposition theorem and the arrangement of resistors.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the use of the superposition theorem and question the arrangement of resistors, particularly whether certain combinations are in series or parallel. There is uncertainty about the interpretation of the circuit layout and the implications for calculating voltage drops.

Discussion Status

The discussion is ongoing, with participants providing insights and questioning each other's reasoning regarding the circuit configuration. Some guidance has been offered about the relationships between the resistors, but no consensus has been reached on the correct approach to finding V1.

Contextual Notes

Participants note difficulties in interpreting the circuit images provided, which may affect their understanding of the resistor combinations. There is also mention of imposed homework constraints that guide the discussion.

Jamessamuel
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Homework Statement


given the circuit shown, find V1.
12231610_1652042151703604_2077339994_n.jpg

Homework Equations

The Attempt at a Solution


see image:
am i right? Video says otherwise... I chose to use the superposition theorem here.
12200761_1652042148370271_1013343203_n.jpg


help appreciated,

regards,

james.
 
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Jamessamuel said:

Homework Statement


given the circuit shown, find V1.
[ ATTACH=full]91899[/ATTACH]

Homework Equations

The Attempt at a Solution


see image:
am i right? Video says otherwise... I chose to use the superposition theorem here.
[ ATTACH=full]91898[/ATTACH]

help appreciated,

regards,

james.
That second image is very difficult to read.

It appears that you took the 80Ω and 120Ω to be a parallel combination, which is correct. However, that combination is NOT in series with the 8Ω resistor.
 
SammyS said:
However, that combination is NOT in series with the 8Ω resistor.
I think they're considered in series for getting the current through them when the 1A supply is ignored, but must be separated to get individual resistor voltage drops. Once all individual voltage drops are gotten they are then combined (superpositioned?) for the answer.
 
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surely this is correct?
12242271_1652116441696175_986558241_n.jpg
 
Jamessamuel said:
surely this is correct?
[ ATTACH=full]91916[/ATTACH]
That's fine for the 6A source.

There is a different parallel/series combination you need to use for the 1A source. For this, there is no 56Ω combination.

(Thanks, insightful.)

Added in Edit:
The above refers to the following:
upload_2015-11-16_7-56-6.png


The 40Ω and 8Ω are in series.
That combination and the other two resistors, 80Ω and 120Ω, are all in parallel with the other.
 
Last edited:

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