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I'm trying to simplify this circuit but I'm not very sure about what the next step is. Something tells me that I could ignore R5, R6 and R7 and it would be the same but I'm not very sure. Any help would be appreciated, thanks.

Original circuit

Best attempt

Edit: This is my new attempt but I'm not too sure about it. New best attempt

Edit 2: Latest attempt enter image description here

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  • \$\begingroup\$ Is this homework? Normally people only provide hints to homework questions. Here is a hint for now. What you did on the whiteboard appears correct. Looking at the whiteboard do you see any more resistors in series or parallel that could be simplified? \$\endgroup\$
    – user57037
    Dec 16, 2020 at 0:30
  • \$\begingroup\$ @mkeith Yes, it is. I edited my original post to add what I think might be the answer but I'm not feeling too sure about it. Sorry, I'm new. \$\endgroup\$
    – E. M.
    Dec 16, 2020 at 0:43
  • \$\begingroup\$ You are doing great. Nothing to be sorry about. But it seems like you dropped something, though. You combined R2 and R3 in parallel, but there was a wire (0 Ohm resistor) in parallel with the whole R5,R6,R7 series/parallel mix. You were right to wonder if R5, R6 and R7 are doing anything. \$\endgroup\$
    – user57037
    Dec 16, 2020 at 0:48
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    \$\begingroup\$ Yes you can simplify it, but follow your gut on R5,R6,R7. The white board work is wrong in this regard. \$\endgroup\$
    – Aaron
    Dec 16, 2020 at 1:03
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    \$\begingroup\$ I edited my post with another attempt, still not really sure about what I'm doing. \$\endgroup\$
    – E. M.
    Dec 16, 2020 at 2:10

2 Answers 2

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Much of this exercise involves identifying and simplifying circuit elements before combining them all into a solution. It is an important skill to learn.

Can you see that all three versions (below) are similar?

schematic

simulate this circuit – Schematic created using CircuitLab

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  • \$\begingroup\$ Yes, I can see that they are. It looks like I can't understand what to do after this though, would you suggest something to study for me to be able to understand what to do in this situation? \$\endgroup\$
    – E. M.
    Dec 16, 2020 at 1:44
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    \$\begingroup\$ Your math skill combining resistors in parallel & in series is excellent. But you're having trouble dealing with a short-circuit across \$ R_6 + \frac{R_5*R_7}{R_5+R_7}\$. Draw this short-circuit as a resistor having zero ohms - perhaps that'll help. \$\endgroup\$
    – glen_geek
    Dec 16, 2020 at 2:12
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Your instinct with " Something tells me that I could..." is good. What is the resistance of the vertical path that connects R2 and R3 to R4. That path is in parallel with the R5, R6, R7 circuit.

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