Help Calculating Thevenin Resistance

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    Resistance Thevenin
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Homework Help Overview

The discussion revolves around calculating the Thevenin resistance and voltage in a circuit involving resistors. The original poster expresses uncertainty about the values and relationships between the components in the circuit diagram.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants explore the relationships between resistors in the circuit, questioning whether certain resistors are in series or parallel. There are attempts to clarify the method for calculating Thevenin resistance and voltage, with discussions on using voltage dividers and Kirchhoff's laws.

Discussion Status

Participants are actively engaging with the problem, offering guidance on circuit analysis methods. There is a recognition of multiple interpretations of the circuit layout, and some participants have provided insights into how to approach finding the Thevenin voltage and resistance.

Contextual Notes

Some participants note the confusion arising from the circuit diagram and the need for clarity on the connections between components. There is mention of homework constraints that may influence the approach to finding the Thevenin resistance.

  • #31
maherelharake said:
So that is the Thevanin voltage?

You should be in a position to answer that question yourself. Reread the definition and prescribed method of determining the Thevenin voltage.
 
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  • #32
Yes I believe it is based from previous responses. So now I need to find the shorted current, and use the Voltage I just found to find the Thevenin R?
 
  • #33
maherelharake said:
Yes I believe it is based from previous responses. So now I need to find the shorted current, and use the Voltage I just found to find the Thevenin R?

Why? You found the R previously. Go back to post #9 and what led up to it.
 
  • #34
That's what I thought, but my worksheet says that in order to find the R, I have to have an I first. Is there another way to find it using that procedure?
 

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  • #35
Well, perhaps they suggest that you do it that way, but it is not the only way. You can either find the resistance by shorting out the voltage sources, opening any current sources, and determining the resistance seen at the terminals, or you can determine the open circuit voltage and short circuit current and obtain R = V/I. You've already done the first method. If you want to do the second as well, fine. You'll get the same result.
 
  • #36
I see. So just for my personal knowledge, how do you find the short circuit current? Is it by using loop rules?
 
  • #37
maherelharake said:
I see. So just for my personal knowledge, how do you find the short circuit current? Is it by using loop rules?

That is one way. Any valid circuit analysis method that gets you where you want to go is fine. Use what you're comfortable with.
 
  • #38
Ok. Thanks
 

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