Calculation of equivalent resistance

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Homework Help Overview

The discussion revolves around calculating the equivalent resistance between two points in a circuit diagram. The subject area is electrical circuits, specifically focusing on the concepts of series and parallel resistors.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the identification of resistors in series and parallel configurations. There are suggestions to number the resistors and clarify their relationships. Some participants express confusion about their attempts to simplify the circuit and question the correctness of their reasoning.

Discussion Status

The discussion is ongoing, with participants providing guidance on how to approach the problem. There is an emphasis on sharing reasoning and working out the circuit to identify potential errors. Multiple interpretations of the circuit configuration are being explored.

Contextual Notes

Participants are encouraged to post their drawings and reasoning, as there is a lack of clarity regarding the circuit setup and the relationships between the resistors. The original poster's calculations have not aligned with expected results, leading to further inquiry into their approach.

Arka420
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Homework Statement

: [/B]Given the circuit diagram, find the equivalent resistance between points P and Q.
ngodxd.png

Homework Equations

: [/B]ΔVloop = 0, ΔIjunction = 0 and V = IR

The Attempt at a Solution

: [/B]Eliminating the wires with no resistors and solving for resistance gives me the answer as (11/10) R, which is not the answer. I'm confused as to which resistors are in parallel and which resistors are in series.
 
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Perhaps start by numbering the resistors A, B, C etc and post the drawing again.

Tell us which you think are in series or parallel. For example "I think A is in series/parallel with..."

Normally this type of problem is simplified by replacing two resistors in series or parallel with one and redrawing the circuit. You've posted the original so show us the first step/simplification that you made.
 
Arka420 said:

Homework Statement

: Given the circuit diagram, find the equivalent resistance between points P and Q.
ngodxd.png
[/B]

Homework Equations

: ΔVloop = 0, ΔIjunction = 0 and V = IR[/B]

The Attempt at a Solution

: Eliminating the wires with no resistors and solving for resistance gives me the answer as (11/10) R, which is not the answer. I'm confused as to which resistors are in parallel and which resistors are in series. [/B]
Post your working out. We have no way of knowing where you went wrong (and therefore how to help you/ correct any mistakes) if we can't see your reasoning, but the attempt at the problem appears to be right (eliminate the short wire and simplify using the rules for resistors in series/ parallel).
 
Remember also the rule that if multiple resistors have the same voltage drop associated with them then they are parallel
 
This is how I worked out the circuit. Is it correct?
24ex442.png
 
Arka420 said:
This is how I worked out the circuit. Is it correct?
24ex442.png
Not correct.

Follow this advice:
CWatters said:
Perhaps start by numbering the resistors A, B, C etc and post the drawing again.

Tell us which you think are in series or parallel. For example "I think A is in series/parallel with..."
 

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