Calculating Thevenin Resistance - Load Removal & Voltage at Load Terminals

  • Thread starter Thread starter esmeco
  • Start date Start date
  • Tags Tags
    Thevenin
Click For Summary

Discussion Overview

The discussion revolves around the calculation of Thevenin resistance in circuits with load resistors, specifically addressing whether the load should be removed and how to determine the voltage at the load terminals. The scope includes theoretical understanding and practical application in circuit analysis.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the necessity of removing the load resistor to calculate Thevenin resistance and voltage at the load terminals, citing conflicting information from peers and online sources.
  • Another participant suggests a structured approach to finding Thevenin equivalent parameters, including removing the load, finding the voltage across the terminals, and calculating the equivalent resistance, while noting that the method varies depending on the presence of independent or dependent sources.
  • A participant mentions using practice exams instead of a textbook, indicating a language barrier with their reference material.
  • There is a suggestion to refer to video examples for further clarification on the topic.

Areas of Agreement / Disagreement

Participants express differing views on whether the load resistor must be removed to find Thevenin voltage, indicating a lack of consensus on this aspect of circuit analysis.

Contextual Notes

Participants highlight potential confusion stemming from varying instructional materials and methods, as well as the distinction between independent and dependent sources in circuit analysis.

esmeco
Messages
144
Reaction score
0
I was wondering,how do we calculate the thevenin resistance in a circuit with a load resistor?Do we remove the load?How do we calculate the voltage Lat the load terminals.Like for example in this circuit:

http://i75.photobucket.com/albums/i281/esmeco/superpositionandthevenin.jpg

I'm a bit confused now...
 
Last edited by a moderator:
Physics news on Phys.org
Can anyone help me?
 
What book are you using?
 
Actually I'm not using a book...If you're referring to those exercises,they're practice exams...ANd for guidance I'm using a book in a language which isn't english...But I'm really confused because I've heard my colleagues saying that you don't necessarily remove the load resistor to find the thevenin at the load terminals,but on the Internet they all say you have to remove the load resistor inorder to find thevenin voltage...In this case,if we remove the load resistor I'm not sure on how we calculate the voltage at those terminals...
 
Go through the video examples on this website,
http://bcs.wiley.com/he-bcs/Books?action=resource&bcsId=2149&itemId=0471487287&resourceId=5675

I think it will help you out more.

As far as Thevinin's goes, you:

1) Remove the load.
2) Find the voltage across the terminals of the removed load [itex]V_{th}[/itex]
3) Find the Thevenin equivalent resistance at those terminals [itex]R_{th}[/itex]

If only independent sources,
short voltages
open currents

If only dependent or both dependendent and independent it differs.
I'll type up how to do it, if you need it.

4) Connect the removed load up to your new equivalent circuit,

Vth----Rth----(+)
|
|
|-------------(-)

Load connects to (+), and (-) terminal
 

Similar threads

  • · Replies 17 ·
Replies
17
Views
3K
Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 42 ·
2
Replies
42
Views
7K
Replies
9
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 45 ·
2
Replies
45
Views
9K
Replies
3
Views
2K