Solving Thevenin Circuit with R1 Removed: Explanation and Calculations

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SUMMARY

The discussion focuses on solving a Thevenin circuit with resistor R1 removed, where R1=3Ω, R2=6Ω, R3=3Ω, R4=4Ω, and R5=6Ω. The user seeks to calculate the Thevenin resistance (Rth) and voltage (Vth) using Thevenin's theorem. The correct formula for Rth is Rth = (R2 * R3) / (R2 + R3) + R4 + R5, although there is confusion about whether to include R5 in the calculation. The user is advised to replace voltage sources with shorts when calculating Rth and to utilize Kirchhoff's rules for further analysis.

PREREQUISITES
  • Thevenin's Theorem
  • Kirchhoff's Voltage Law (KVL)
  • Basic circuit analysis techniques
  • Understanding of series and parallel resistor combinations
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  • Calculate Thevenin voltage (Vth) for the given circuit configuration
  • Review the application of Kirchhoff's rules in circuit analysis
  • Explore advanced circuit simulation tools for visualizing circuit behavior
  • Study the impact of removing components on circuit performance
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Electrical engineering students, circuit designers, and anyone studying Thevenin's theorem and circuit analysis techniques.

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pic aint working, going to upload it again. If you just copy & paste the URL it works fine
http://cottage7.angelfire.com/Thevenin.png

I've been using this site for a while but I finally have a problem that I could not relate to another on this site so here I am!


Homework Statement


I must calculate the current through R1 given:
R1=3Ω
R2=6Ω
R3=3Ω
R4=4Ω
R5=6Ω

R1 MUST be taken out and thevenin's theorem used.

Homework Equations


http://cottage7.angelfire.com/Thevenin.png

The Attempt at a Solution


i can't seem to wrap my head around on how to set up the loops. Pulling R1 (which is at a->b) leaves an ugly looking circuit.

Rth =(R2)(R3)/(R2+R3) + R4 + R5

is this thevenin resistance correct? Somebody told me to ignore R5 but that doesn't seem right.

Once i find Vth & Rth I imagine the rest will be simple, kirchhoff's rules & linear equations, etc.
 

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If you go to advanced mode, you can attach pictures so you don't have to host them somewhere else. I attached your diagram to the post for you.
 
Your Thevenin resistance isn't correct. You want to replace the voltage sources by shorts.

As far as calculating the Thevenin voltage goes, you have only two loops. What current flows through R5 since it's not part of a loop?
 
Last edited:

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