Finding Equivilent Thevinen Resistance in this circuit

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Discussion Overview

The discussion revolves around finding the equivalent Thevenin resistance in a specific circuit configuration. Participants explore different methods to simplify the circuit, including series and parallel combinations of resistors, as well as transformations between wye and delta configurations.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant expresses uncertainty about whether resistors R2 and R3 can be considered in series, seeking guidance on the next steps to find the Thevenin resistance.
  • Another participant suggests performing a wye to delta transformation with resistors R1, R2, and R4, proposing that this would allow them to treat R1, R2, and R4 as being in series while neglecting R3 due to its position in the circuit.
  • A different participant recommends starting from the outer nodes and working towards the center, indicating that R3 and R1 are in series, and that their combination is in parallel with R2, followed by a series connection with R4.
  • One participant mentions successfully finding Vth and Isc and notes the relationship Rth = Vth/Isc, indicating a realization about the simplicity of the calculations involved.

Areas of Agreement / Disagreement

The discussion does not reach a consensus on the best approach to simplify the circuit, as participants propose different methods and express varying levels of confidence in their strategies.

Contextual Notes

Participants do not clarify certain assumptions regarding the circuit configuration, and there are unresolved steps in the mathematical reasoning related to the combinations of resistors.

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Homework Statement



This is what I have it reduced to so far, http://images3a.snapfish.com/232323232%7Ffp733%3A2%3Enu%3D52%3A%3A%3E379%3E256%3EWSNRCG%3D335%3A%3B25%3B94347nu0mrj", but I am not sure if R2 and R3 can be considered in series or not. Please let me know how to handle the next step here as I am lost. I am trying to find Vth of AB but I need Rth first.

Homework Equations


The Attempt at a Solution

 
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Or perhaps I can do a wye to delta transform with R1 R2 and R4 and then i will have R1 R2 and R4 in series and not take into account the 5ohm resistor (R3) because the Vdrop of the 5 ohm resistor is after the AB circuit.
 
I usually start away from the nodes and work towards... I'd start off with R3 AND R1 in series. Then it looks like the combination of those two are sharing nodes with R2. Then the result of the parallel resistors will be in series with r4.

try doing this and redrawing the circuit after each combination. the more you do it, the faster it'll be and u can skip the new drawings...
 
thanks, I eventually got it but then i realized that Vth and Isc (short circuit) was easy to find and I could use Vth/Isc=Rth but none-the-less thanks for the help!
 

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