Effective resistance for Thevenin's theorem

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Discussion Overview

The discussion revolves around the concept of effective resistance in the context of Thevenin's theorem, specifically how to calculate it between two points in a circuit. Participants explore the definitions and implications of effective resistance, as well as the differences in approaches to determining it.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant expresses confusion about the meaning of "effective resistance between two points" and questions the inclusion of certain components in the calculation.
  • Another participant clarifies that effective resistance refers to the resistance measured by an Ohmmeter placed across the two points in question.
  • The first participant suggests a formula for calculating effective resistance but is uncertain about the inclusion of additional components as shown in a referenced video.
  • A later reply encourages the first participant not to feel embarrassed for asking questions, emphasizing the importance of clarifying doubts.

Areas of Agreement / Disagreement

There is no consensus reached regarding the specific components to include in the calculation of effective resistance, as one participant questions the methodology presented in a video while another provides a clarification. The discussion remains unresolved with differing viewpoints on the calculation process.

Contextual Notes

Participants do not fully agree on the interpretation of effective resistance, and there are assumptions about the circuit configuration that are not explicitly stated. The discussion also reflects a potential misunderstanding of the role of certain circuit elements in the calculation.

irrationally
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Homework Statement


Me again. I again got confused with 2 similar things done differently on two different places. Let's say we have some arbitrary circuit and we want to replace a part of it with thevenin's generator. We also need to calculate effective Thevenin's resistance, which is where i found the problem.
New_Project.png

Suppose we need to find the effective resistance between points 1 and 2 at the picture. First of all , what does "effective resistance between two points" even mean. Second, I would say "Rt = R2+R3+R4" and according to my workbook that is correct. But if we take a look at this example (at 3:50 for example), we will see that the "hanging" edge is also taken into account. Why ?

Homework Equations


Thevenin's theorem

The Attempt at a Solution


Like i mentioned, I simply used "Rt = R2+R3+R4" which turns out to be correct. Why does the guy in the video take that other edge into account??[/B]
 
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The effective resistance between two points means, if you were to put an Ohmmeter across those points, that's the resistance that it would measure.

I didn't watch the video, but it would appear from the still shot that the "hanging edge" you refer to is in the path of the imaginary Ohmmeter that you would use to measure the effective resistance you're looking for.
 
Oh. well thanks, I feel like an idiot now :D
 
irrationally said:
Oh. well thanks, I feel like an idiot now :D
:) Don't. Better to ask and banish all doubt than to leave it to muddy your thought processes forever!
 

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