Determine potential difference (circuits)

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Homework Help Overview

The discussion revolves around determining the potential difference between two points in a circuit, specifically Va and Vb. The subject area involves circuit analysis, focusing on voltage, current, and the application of fundamental circuit laws.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to calculate the potential difference using known current values and circuit laws but expresses uncertainty about the next steps after finding the current directions. Some participants suggest choosing a reference point for potential and considering the potential changes across circuit elements.

Discussion Status

Participants are exploring different interpretations of the problem, with some providing guidance on how to approach the calculation of potential differences. There is a noted attempt to clarify the relationship between current direction and potential changes, but no explicit consensus has been reached regarding the final answer.

Contextual Notes

The original poster mentions a specific expected answer of 45V, which raises questions about the assumptions or calculations leading to that expectation. The discussion includes a precise value of 45.3846V provided by another participant, indicating a potential discrepancy in the expected results.

kyle
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Homework Statement



Va - Vb

reCeGVK.gif


Homework Equations



V = IR
Loop rule
Node rule

The Attempt at a Solution



I'm able to find each I value, as well as the direction of current. I'm not sure what to do after that. I know the answer should be 45V, but everything I've tried doesn't lead to that.
 
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Choose the zero of the potential at b. Knowing the currents on each resistor, choose a path leading from b to a, find the change of potential across each element. Note that the potential decreases in the direction of flow of a current.


ehild
 
45,3846V exactly, that is 590/13V
 
mr_pavlo said:
45,3846V exactly, that is 590/13V

It looks correct. :smile:

ehild
 

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