Solving an Electrical Problem: 79.2V Answer

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Discussion Overview

The discussion revolves around a practice electrical problem where the expected answer is 79.2V. Participants are attempting to identify mistakes in the problem-solving process and clarify the necessary equations for solving the circuit.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses confusion over their solution, which does not match the expected answer of 79.2V, and seeks assistance in identifying their mistake.
  • Another participant suggests that the original poster should upload their work using a different image hosting method for better accessibility.
  • A participant points out that the original poster has two equations but three unknowns, indicating that an additional equation is necessary to solve the problem correctly.
  • It is noted that a supermesh is not needed for the circuit in question due to the presence of a current-controlled voltage source, which affects the equations required.
  • Some participants report issues accessing the provided links to the circuit diagram, indicating a need for clearer sharing methods.
  • A later reply claims to have solved the problem and confirms the answer of 79.2V, providing specific current values for the circuit components.

Areas of Agreement / Disagreement

There is no consensus on the correct approach to the problem, as participants express differing views on the necessity of additional equations and the use of supermesh analysis. The discussion remains unresolved regarding the original poster's specific errors.

Contextual Notes

Participants highlight limitations in the original poster's equations due to the number of unknowns versus equations. There is also a noted difficulty in accessing shared resources, which may hinder the discussion.

mugzieee
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hello. I was reading through the chapter, and i came across a practice problem. The given answer for the problem is 79.2V. I attemted to solve it, but i don't get the same answer. ICould you guys please help me out and tell me where i am making a mistake? Thanx in advance

http://www.freeimagehosting.net/uploads/th.d669771024.jpg
 

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Might want to just print screen, copy/paste and upload the work to imageshack or something.
 
Last edited:
first off you can't solve these 2 equations that you have, because you have 3 unknowns and 2 equations. You need another equation.

I see you used a supermesh for mesh 2 and 3, however you don;t need it. That is a current controlled voltage source there. This is why you are missing one equation. It would be a different story if there was a current source there.
 
I can't open your file or get any of your links to work to see the Circuit Diagram.
 
cyrusabdollahi said:
I can't open your file or get any of your links to work to see the Circuit Diagram.

They aren't linked correctly, so you have to copy and paste it. Copy and paste the 3rd link and edit it to a basic URL.

teknodude said:
first off you can't solve these 2 equations that you have, because you have 3 unknowns and 2 equations. You need another equation.

my mistake, i looked at your work briefly and just saw the two numbered equations. I did the problem this time and get 79.2V. Your currents should be i1 = 3.08A i2=2.27A and i3=1.98
 
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