Solving Basic Circuit Question - Bila's Request for Help

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Discussion Overview

The discussion revolves around a basic electrical engineering problem concerning the calculation of equivalent resistance and voltage in a circuit diagram. Participants are exploring the implications of current flow and voltage polarity in the context of a homework question.

Discussion Character

  • Homework-related
  • Exploratory
  • Technical explanation

Main Points Raised

  • Bila expresses difficulty in determining the equivalent resistance from a circuit diagram and seeks assistance.
  • SammyS suggests that no current flows across a specific gap in the circuit, which is a critical point for solving the problem.
  • Bila calculates Vo to be +2.0V but notes that a friend claims it should be -2.0V, leading to uncertainty about the correct polarity.
  • Another participant points out that the circuit diagram indicates which side is positive if Vo is a positive number, emphasizing the need for Bila to determine the actual polarity based on the circuit layout.
  • There is clarification that there is only one 200Ω resistor in the circuit, and the voltage difference magnitude is confirmed to be 2V, but the polarity remains a point of contention.

Areas of Agreement / Disagreement

Participants have not reached a consensus regarding the polarity of the voltage Vo, with differing opinions on whether it should be +2.0V or -2.0V. The discussion remains unresolved on this point.

Contextual Notes

There are limitations regarding the assumptions made about current flow and voltage polarity, which are not fully explored or resolved in the discussion.

masum79
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Hello
I am new to the forum as well as a new EE student. Can't figure it out this particular diagram in terms of how to find an equivalent resistance. Any kind help would be very very appreciated.
Thanks in advance. Please see attached.
Bila
 

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masum79 said:
Hello
I am new to the forum as well as a new EE student. Can't figure it out this particular diagram in terms of how to find an equivalent resistance. Any kind help would be very very appreciated.
Thanks in advance. Please see attached.
Bila
Hello masum79. Welcome to PF !

This thread has been moved to the Engineering Homework section.

Before we can help with homework, you must show some effort towards a solution.

Hint: No current flows across the gap marked v0 .

[ IMG]https://www.physicsforums.com/attachment.php?attachmentid=59042&d=1369634684[/PLAIN]
 
Dear SammyS, Thank you for the lead.
I figure it out since there is not current going through. So, I found Vo to be +2.0V. But my friend said it would be -2.0V. That one I am not sure why It would be minus instead of plus.--Bila
 
masum79 said:
I figure it out since there is not current going through. So, I found Vo to be +2.0V. But my friend said it would be -2.0V. That one I am not sure why It would be minus instead of plus.
How did you get +2V?
 
masum79 said:
Dear SammyS, Thank you for the lead.
I figure it out since there is not current going through. So, I found Vo to be +2.0V. But my friend said it would be -2.0V. That one I am not sure why It would be minus instead of plus.

--Bila
What is the voltage drop across (either) 300 Ω resistor?

What is the voltage drop across (either) 200 Ω resistor?
 
There is only one 200Ω resistor.

The magnitude of the voltage difference is indeed 2V. The question now is the polarity.

The circuit diagram tells you which side is +ve _if_ Vo is a positive number. The OP needs to work out which side actually is more positive than the other.
 
CWatters said:
There is only one 200Ω resistor.
DUH !

I've got to proof my posts better !


Too much cut & paste .
 

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