Why Is My Calculation of Voltage Over 1.5R x R Incorrect?

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Discussion Overview

The discussion revolves around a participant's confusion regarding a calculation of voltage over a circuit involving resistors, specifically 1.5R and R, in the context of an upcoming exam. The focus is on understanding the correct approach to calculating voltage and current in a circuit with resistors in parallel and series.

Discussion Character

  • Homework-related

Main Points Raised

  • One participant seeks clarification on their calculation of voltage over 1.5R x R, indicating a misunderstanding in their approach.
  • Another participant suggests treating the 1.5R and R as parallel resistors and then combining them in series with a 0.6R resistor to find the overall resistance, which is a proposed method to solve the problem.
  • A third participant expresses gratitude for the help received and requests further clarification on the assumptions made in their initial attempt to avoid similar mistakes in the future.
  • One participant comments that the issue seems basic and advises familiarity with Kirchhoff's voltage and current laws as a way to improve understanding.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specific error in the original calculation, and multiple approaches to the problem are presented without resolving the confusion.

Contextual Notes

The discussion does not clarify the assumptions made in the original calculation or the specific definitions of the components involved, leaving some aspects unresolved.

faen
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Homework Statement



Can somebody please explain to me what i did wrong here? Got exam tomorrow and it would probably be usefull to know.. Thx

skann0006.jpg


Homework Equations



axb = a*b/(a+b)

The Attempt at a Solution



First i tried finding the voltage over 1.5R x R.. Then divide that voltage over R to find the current over R... For some strange reason this is wrong. Plz someone help me to understand why..
 
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treat the 1.5R and R as parallel. then in series with the 0.6R to get the overall resistance. current going through 0.6R = voltage/overall R. Then the same current split into the 1.5R and R, calculate.
 
nice, thanks a lot. Now i got further :)

However if u would be able to point out what i assumed wrong in my first attempt itd be apreciated as well, so i don't happen to do a similar mistake again
 
hmm... its like really basic. just get familar with kirchhoffs v and i law. u'll be fine
 

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