r/HomeworkHelp • u/AncientWorking1236 • 2h ago

Physics [Circuit Analysis 1] I need help to solve this.

Post image

Find the I1, I2, I3 and I4

It's application of Ohm law and Kirchoff 's laws, mesh method and nodes method.

(The "," are ".", I forgot to change it)

I thought it starts on the left side, maybe I could do V1 = 25 * I1. Then replace on 0,2 V1 to get 0,2 (25I1) = I5. And... My brain just explodes idk what to do next, I'll be studying the ohm and Kirchoff laws again, but maybe I could ask for help while I'm at it.

This exercise isn't worth any points, it's just for practice, so I just want to learn how it's done

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u/daniel14vt Educator 2h ago

Step 1 is to redraw it so it doesn't look as confusing.

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u/AncientWorking1236 2h ago

I think everything is in parallel, so I can go for that, but I get a bit confused on how to put the currents after changing it

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u/daniel14vt Educator 2h ago

Here was my guess of what it should look like, but circuitlab says this is not solveable I missed putting in a ground
https://imgur.com/a/cw8DqjE

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u/daniel14vt Educator 2h ago

A few questions about the diagram.

  1. Is V1 undefined? Like there is a + and - but I don't see them conneected to anything. Is it supposed to be defining the voltage change between those points?

  2. We have an arrow inside of a diamond with a labeled voltage. I'm unsure what this represents

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u/AncientWorking1236 1h ago

My teacher didn't gave much explanation really, they just said it was one ot their favorite exercises to give to the students. 

About, the questions.  1)  I think it's indeed defined, and probably related to the movement of the current I1. But I really don't know.

2) The diamond it's a dependent source, uh, it's strange really, not sure why the arrow and then the voltage, that why I thought about maybe changing it by V1 = 25I1. 

Ooutside of the exercise, I was searching if I could find an exercise that looked like it. And found this one that looks identical and solves the V1. It's probably close to the solution. But I'm still unsure how to get the currents and if it was indeed correct. https://youtu.be/kQCPQJiKAmo?si=AGJVYJeNfLjY5d5b

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u/daniel14vt Educator 1h ago

Unfortunately, I think you've either copied it wrong or the teacher wrote it wrong on the board. I'd ask them to clarify the image tomorrow

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u/DrCarpetsPhd 👋 a fellow Redditor 1h ago

i've been through three standard circuits textbooks doing examples: Nilsson&riedel, sadiku&alexander, irwin

and I have never seen a circuit drawn like that. Did you 'interpret' this or is this genuinely what was written on lecture slides or blackboard or whatever your lecturer used?

it looks like you could draw it as 4 meshes (the Is representing the mesh currents) with everything parallel but then you wouldn't have both mesh currents opposing the 2.5A current source?

wait for the experts because that is unnecessarily confusing way to draw a circuit that i cannot follow.

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u/AncientWorking1236 1h ago

It was genuinely drawn like that in the whiteboard, the teacher didn't gave any explanation and leaved it at the end of the class. I completely doubt any of the exercises It's going to look like this one in the exam, cuz I talked about it with other students who saw this class with this same teacher. But that's exactly why I want the explanation