Determine sources being charged

  • Thread starter Thread starter mugzieee
  • Start date Start date
  • Tags Tags
    Charged Sources
Click For Summary

Discussion Overview

The discussion revolves around a problem related to determining which sources in a circuit absorb positive power and verifying that the algebraic sum of the absorbed power values equals zero. The context includes circuit analysis and power calculations, with participants sharing their approaches and challenges in understanding the problem.

Discussion Character

  • Homework-related
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant reports difficulties in calculating the absorbed power values, listing specific power values but not achieving a sum of zero.
  • Another participant points out potential issues with the notation used for the sources, suggesting that some sources are incorrectly labeled, which could affect the analysis.
  • There is a discussion about the correct representation of current and voltage sources, with emphasis on standard notation practices.
  • A participant expresses confidence in the accuracy of their circuit drawing, stating it was copied directly from the textbook.
  • One participant indicates they will wait for clarification from the professor, acknowledging the limitations of the textbook in explaining the concepts.

Areas of Agreement / Disagreement

Participants do not reach a consensus regarding the correctness of the circuit representation or the power calculations. Disagreement exists about the notation and its implications for the analysis.

Contextual Notes

There are unresolved issues regarding the notation of sources in the circuit, which may affect the calculations. The discussion highlights a dependence on the textbook's presentation of the circuit, which some participants find unclear.

Who May Find This Useful

Students working on circuit analysis problems, particularly those involving power calculations and source notation, may find this discussion relevant.

mugzieee
Messages
77
Reaction score
0
i keep getting stuck in this problem, i don't see what I am doing wrong.
the problem says to determine which sources absorb positive power, then show that algebraic sum of the five absorbed power values is zero.
i have attached a picture of the circuit, and here is what i have done:
Starting from left to right,
p=-4W
p=-16W
p=40W
p=-50W
p=-30W
I am not getting the sum to equal 0.
From what i understand, when current is going from + to - in a independent voltage source it is charging and when it is going from - to + it is releasing power, and that is the guidelines i have used to get the bove answers. I am just not sure if I am supposed to follow the same guidelines for independent current sources. Is there a website that discusses these topics, kuz my book has not done a good job to demonstrate these ideas very clearly.
 

Attachments

Physics news on Phys.org
Yeah, something is nonsensical there. First of all, there is a really weird mixed notation for the sources. Some of them are drawn as current sources (with the arrow inside), but are labelled with a voltge. That's incorrect.

And if you correct the notation so that all sources labelled with a voltage are drawn as voltage sources, then you basically get three 10V voltage sources in parallel, with a single current source also connected in parallel. But the currents don't add up correctly in that case either, since you end up with different currents in different legs, even though they have the same voltage source in each.

Are you sure you have correctly drawn the circuit?
 
ya, I am positive that the circuit is drawn correctly, i just copied it straight out of the book...
 
But a current source with a voltage notation across it is not standard. Sorry that I'm not of more help.
 
its ok, I am just going to wait until the professor goes over the answer in class today. i mean that's the circuit the book has given us, so that's what I've been trying to work on. thanks for your help tho
 

Similar threads

Engineering Determining if voltage or current is positive or negative with sources
  • · Replies 10 ·
Replies
10
Views
6K
Why does amplifier sink power for Vout>0 and sources power for Vout<0?
  • · Replies 1 ·
Replies
1
Views
2K
The validity of the interconnection of ideal sources
  • · Replies 16 ·
Replies
16
Views
6K
Engineering Why is the voltage source high potential into node 1 at -12 V in this op amp problem?
  • · Replies 15 ·
Replies
15
Views
3K
How should I Approach this Circuit Calculation?
  • · Replies 7 ·
Replies
7
Views
2K
Comp Sci Markov model to find the probability of a Pepsi drinker buying a Coke?
  • · Replies 4 ·
Replies
4
Views
2K
Power Source, Current Source and Resistor in parallel
  • · Replies 2 ·
Replies
2
Views
6K
Power delivered to each source. Image included
  • · Replies 1 ·
Replies
1
Views
2K
Engineering Step response of RC circuit with independent voltage and current sources
  • · Replies 7 ·
Replies
7
Views
3K
Source transformation, current & voltage sources
  • · Replies 3 ·
Replies
3
Views
2K