# Help solving for equivalent resistance

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.

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

Edit 2: Latest attempt

• 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? Dec 16, 2020 at 0:30
• @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. Dec 16, 2020 at 0:43
• 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. Dec 16, 2020 at 0:48
• Yes you can simplify it, but follow your gut on R5,R6,R7. The white board work is wrong in this regard. Dec 16, 2020 at 1:03
• I edited my post with another attempt, still not really sure about what I'm doing. Dec 16, 2020 at 2:10

## 2 Answers

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?

simulate this circuit – Schematic created using CircuitLab

• 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? Dec 16, 2020 at 1:44
• 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. Dec 16, 2020 at 2:12

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.