Find the Equivalent Resistance in Complicated Electrical Circuits

  • Context: High School 
  • Thread starter Thread starter Grievery
  • Start date Start date
  • Tags Tags
    Circuits Eletrical
Click For Summary

Discussion Overview

The discussion revolves around finding the equivalent resistance in complicated electrical circuits. Participants explore methods for transforming circuit diagrams to identify series and parallel connections, with a focus on understanding the process rather than just obtaining a final answer.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant expresses difficulty in transforming complicated circuits to identify series and parallel resistors and requests a step-by-step method.
  • Another participant suggests labeling components in the circuit diagram to facilitate discussion and understanding, mentioning specific resistors R1 and R2.
  • A later reply indicates that the original poster has labeled the resistors but still seeks guidance on finding the equivalent resistance.
  • One participant mentions the usefulness of redrawing the circuit to clarify relationships and suggests that multiple simplifications may be necessary to reach a clear result.
  • Another participant agrees with a proposed answer of 3 ohms but encourages the original poster to engage with the intermediate steps themselves.

Areas of Agreement / Disagreement

Participants generally agree on the approach of labeling components and redrawing circuits, but there is no consensus on a specific algorithm for transforming the circuit or on the steps to take to find the equivalent resistance.

Contextual Notes

Some assumptions about the circuit's configuration may be missing, and the discussion does not resolve the specific methods for simplification or the correctness of the proposed answer.

Grievery
Messages
3
Reaction score
0
Hi! I have been trying to understand how a "complicated" circiut can be transformed to show which resistors are connected in series and which are parallel... Sometimes I manage to do it but it's often too hard for me because I can't find any sort of algorithm about it. Could anybody show me "step-by-step" how to transform this circuit for example...?
arx1303670379t.jpg

We need to find the equivalent resistance...
Thank you in advance!
 
Physics news on Phys.org
It's always a good idea to label the components in a diagram. In this case your resistors should be numbered R1, R2 etc. This allows people to identify what is being referred to and, if the OP doesit, doesn't waste 2 posts.
Alternatively you can label the connection nodes, A, B, C etc (which you have already started, but not finished).

I will comment (ask) if your diagram is correct since R1 and R2 are (almost) shorted out.

Can you see which resistors I mean by R1 and R2?

Oh and welcome to PF
 
Last edited:
First of all, thank you for the very quick response... I have labeled the resistors... Now, how can I find the equivalent one.
P.S. The answer is 3 ohms.
jdv1303671601e.jpg
 
I find it often helpful to redraw the network to bring out the relationships. Sometimes you have to do this several times to get a clear result.

The attachment shows a sequence of single step series or parallel simplifications leading to the desired result.

Although I agree with the 3 ohm answer I have left you do do some of the work in the intermediate steps.

Hope this helps
 

Attachments

  • net2.jpg
    net2.jpg
    20.2 KB · Views: 475
Last edited:
Well.. thank you once again! :) I hope now I can figure out HOW to do it myself...
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
1K
Replies
4
Views
2K
  • · Replies 6 ·
Replies
6
Views
19K
  • · Replies 1 ·
Replies
1
Views
6K
  • · Replies 10 ·
Replies
10
Views
6K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 31 ·
2
Replies
31
Views
4K
Replies
5
Views
4K
  • · Replies 36 ·
2
Replies
36
Views
6K