Help Calculating Thevenin Resistance

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    Resistance Thevenin
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SUMMARY

The discussion focuses on calculating Thevenin resistance (Rth) and voltage (Vth) in a circuit with a 10V supply and various resistors. The correct approach involves shorting the voltage source and determining the equivalent resistance seen from terminals A and B. Participants clarify that resistors can be in parallel or series based on their connections after the source is shorted, leading to the conclusion that the Thevenin voltage is derived from voltage drops calculated using voltage divider principles. The final equivalent resistance is established as 32/15 ohms.

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  • Thevenin's Theorem
  • Voltage Divider Rule
  • Kirchhoff's Voltage Law
  • Basic Circuit Analysis Techniques
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  • #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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