Finding the Equivalent Resistance

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Homework Help Overview

The discussion revolves around finding the equivalent resistance in a circuit involving multiple resistors. Participants are examining the configuration of resistors and the relationships between them, particularly focusing on whether certain resistors are in series or parallel.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to clarify the arrangement of resistors R4 and R5, questioning their series or parallel status. Other participants engage by confirming the configuration and discussing the relationship between a 60 Ohm resistor and R5.

Discussion Status

The discussion is active, with participants seeking confirmation of their calculations and interpretations. Some guidance has been offered regarding the arrangement of resistors, and there is an ongoing request for detailed calculations to validate the equivalent resistance value.

Contextual Notes

Participants are working with specific resistance values for R1, R2, R3, R4, and R5, which are provided as givens. There is an emphasis on the need for detailed calculations to support claims about the equivalent resistance.

B18
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1. Homework Statement
Find the equivalent resistance

Homework Equations


Is=I1=I2=...
Vs=V1+V2+...
Rs=R1+R2+...
Ip=I1+I2+...
Vp=V1=V2=...
1/Rp=(1/R1)+(1/R2)+...

The Attempt at a Solution


Sorry the picture is sideways! Is this the correct method for finding the equivalent resistance? The part that confuses me is R5 and R4. Just wasn't sure if they were in series.Thanks for any help you can provide![/B]
https://www.physicsforums.com/attachments/75652
 

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B18 said:
The part that confuses me is R5 and R4. Just wasn't sure if they were in series.

They are not in series, nor are they in parallel. However, there is another set of resistors in that step which are in parallel.
 
Orodruin said:
They are not in series, nor are they in parallel. However, there is another set of resistors in that step which are in parallel.
Would the 60 Ohm resistor be in parallel with R5? and then the equivalent resistor for the 60 Ohm and R5 resistors would be in series with R4?
 
Ok i tried that way. Got an equivalent resistance of 54 Ohms. I don't see any spots that confuse me. Did I do this correctly?
 

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Is anyone able to confirm the equivalent resistance as being 54 Ohms?
 
B18 said:
Is anyone able to confirm the equivalent resistance as being 54 Ohms?
Sorry, we cannot simply confirm answers without seeing the calculation details. Looking over the thread I see more questions than calculations. If you present your calculations and reasoning then we will be happy to comment on the method and results.

Orodruin pointed out a flaw in your first attempt, and it sounds like you've corrected it and proceeded correctly. Can you show those calculations?
 
I redid the circuit simplification. These are all the calculations I can give. The resistance values of R1,R2,R3,R4,R5 are givens. and the top left circuit is the starting point. I am just trying to confirm the equivalent resistance of that circuit. Thank you for helping me to this point.
 

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B18 said:
I redid the circuit simplification. These are all the calculations I can give. The resistance values of R1,R2,R3,R4,R5 are givens. and the top left circuit is the starting point. I am just trying to confirm the equivalent resistance of that circuit.

image1.JPG


Looks good! Nicely presented, too.
 
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Thank you for your help!
 

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