Solve Edgar's Circuit Problem - Get Started Now!

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Discussion Overview

The discussion revolves around solving a circuit problem posed by a user named Edgar, who is seeking assistance in finding the voltage between two specific points in a circuit. The conversation includes various approaches to circuit analysis, including simplification techniques and specific methods like Thevenin's theorem and mesh analysis.

Discussion Character

  • Homework-related
  • Technical explanation
  • Exploratory

Main Points Raised

  • Edgar expresses uncertainty about how to begin solving the circuit problem and requests help.
  • One participant suggests finding the currents through all branches as a starting point.
  • Another participant recommends simplifying the circuit by combining resistors R5 and R6, and writing simultaneous equations to express current flow.
  • Some participants indicate that more detailed information is needed to assist Edgar effectively.
  • A participant recalls learning circuit simplification techniques in the past and encourages Edgar to research series and parallel circuits.
  • Another participant introduces the concept of mesh analysis as a potential method for solving the circuit, suggesting that Edgar may not be familiar with the necessary techniques.
  • Thevenin's theorem is mentioned as a technique to find the voltage between the red points, involving the calculation of the Thevenin resistance (Rth) and short-circuiting the circuit.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the best approach to solve the problem, with multiple methods suggested and some participants expressing the need for more detailed guidance.

Contextual Notes

There are references to various circuit analysis techniques, but the discussion lacks clarity on the specific circuit configuration and parameters, which may affect the applicability of the suggested methods.

Edgar White
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Hi,

I have this circuit (see attached file) and I'm trying to find the voltage between the two red points. I really don't know where to start.. could anyone help me out and get me started ?

Thanks a lot !
- Edgar
 

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Find the currents through all the branches.
 
Simplify the circuit first if possible, like look at R5 and R6 and think about ways to simplify the combination of them that won't affect the voltages that you are trying to calculate.

Then just write a set of simultaneous equations that express how the currents flow through the different legs of the circuit, and solve for the two node voltages marked in red. Like, label the circuit with I1 going from the + (right) of the power supply, through the leg with R3, R4, R1. Label I2 as the current through the circuit leg through R2, R(combo), R7, R1. Then write equations for each node in the circuit, with the sum of all currents entering a node = 0. Solve away...
 
Reply to berkeman

thanks for your help, but that doesn't help much, you really didn't go in depth at all. i need more information
 
yea... and? need more info!
 
Edgar, I did it in grade 10 in Yugoslavia some time ago and I still remember it a bit; you have to simplify it=combine those rezistors; example from 4 make 2, from 2 make 1 etc. To that you should google parallel and series circuits and you will be surprised how simple and interesting it is. Very simple. But, you have to do a bit of reading. Good luck.
 
Edgar White do you know of any DC network analysis techniques? For example using Mesh Analysis. This method involves solving a system of equations (simultaneous equations) which I'm sure you can solve right?

It seems that your problem is not knowing the methods involved in circuit analysis. I'll give you a very good link to tutorial on some DC network analysis techniques. I do encourage you to read each of the discussed techniques and apply the one that (most easily) fits this situation.

http://www.ibiblio.org/obp/electricCircuits/DC/DC_10.html

http://www.ibiblio.org/obp/electricCircuits/DC/DC_7.html
 
Last edited by a moderator:
Edgar White said:
Hi,
I have this circuit (see attached file) and I'm trying to find the voltage between the two red points. I really don't know where to start.. could anyone help me out and get me started ?
Thanks a lot !
- Edgar

Hi Edgar White :

to find the voltage between the red points, use Thevinin's technique; by finding first the (Rth), then I short-circuit..
 
Edgar White said:
Hi,
I have this circuit (see attached file) and I'm trying to find the voltage between the two red points. I really don't know where to start.. could anyone help me out and get me started ?
Thanks a lot !
- Edgar
Hi Edgar White :
to find the voltage between the red points, use Thevinin's technique; by finding first the (Rth), then I short-circuit..
 

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