Why Does a Parallel Circuit Show Different Voltage Readings?

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Discussion Overview

The discussion revolves around a homework question related to a parallel circuit and the reasoning behind a specific voltage reading of -2V. Participants explore the implications of this voltage in the context of circuit analysis and the behavior of voltage sources in parallel configurations.

Discussion Character

  • Homework-related, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks clarification on why the voltage should be -2V, indicating a lack of understanding of the circuit's behavior.
  • Another participant questions the clarity of the original post, highlighting the absence of diagrams and details necessary for understanding the problem.
  • A participant suggests considering the scenario where the voltage source is absent to analyze the terminal voltage of the other elements in the circuit.
  • There is a mention of determining the value of the controlled voltage source and the current ib, which indicates further inquiry into the circuit's parameters.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus, as participants express confusion and seek clarification on different aspects of the problem without resolving the underlying questions about the voltage readings.

Contextual Notes

Participants note the importance of visual aids like diagrams for understanding circuit behavior, suggesting that the lack of such resources may hinder the discussion. There are also references to specific values and conditions that remain unresolved.

rock42
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Homework Statement



https://photos-1.dropbox.com/pi/xl/rLbkcUie-3Lbcrb5YgTa73zJKs4agFowWz6uGFoBq7s/38240/1324436400/1241536/

the image seems to be broken, so here is a link
http://db.tt/fMwm8TrL

I recently picked up a future textbook of mine for something to do over the holidays, so forgive me for asking such a low level question, but I was hoping someone could explain why (in part a) the voltage should be -2V? I understand that, given the answer to part a, that b would be 16 W delivered. Thanks.
 
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So, are you under the impression that folks here are psychic and can divine what you are talking about from the little you have said. No diagrams? No statement of the problem? No hint of what this is all about?

Wait ... my psychic power is kicking in ... I've GOT it. It's about electricity !

EDIT: OK, I see that you have edited you post to include an image, but I can't see it for some reason.
 
Last edited:
rock42 said:

Homework Statement



https://photos-1.dropbox.com/pi/xl/rLbkcUie-3Lbcrb5YgTa73zJKs4agFowWz6uGFoBq7s/38240/1324436400/1241536/

I recently picked up a future textbook of mine for something to do over the holidays, so forgive me for asking such a low level question, but I was hoping someone could explain why (in part a) the voltage should be -2V? I understand that, given the answer to part a, that b would be 16 W delivered. Thanks.

What is the value of ib? And so, what is the value of the controlled voltage source?
 
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rock42 said:
explain why (in part a) the voltage should be -2V?
Imagine that the voltage source in the centre was not present. What would be the terminal voltage of the other two elements?

So the question involving mention of the "interconnection" means what voltage vg could you apply yet not cause any upset to the circuit operating without that vg source being present. (It's a strange way of wording a question.)
 

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