enter image description here

We have to find the equivalent resistance between A and B.

My attempt:

Let's simplify the circuit.


simulate this circuit – Schematic created using CircuitLab




However, this is not the correct answer; the correct answer is 3.125 ohm. Why is that?


I was able to simplify the circuit correctly:


simulate this circuit

  • 6
    \$\begingroup\$ You simplified the circuit incorrectly : try again. \$\endgroup\$
    – user16324
    Jun 5, 2022 at 14:35
  • 3
    \$\begingroup\$ You've redrawn it differently. Try numbering the nodes if you're having trouble. \$\endgroup\$ Jun 5, 2022 at 14:35
  • 2
    \$\begingroup\$ Is R2 really connected to B as you've drawn it? \$\endgroup\$
    – brhans
    Jun 5, 2022 at 14:37

1 Answer 1


This problem is a good example of why diagonal schematic symbols/connections can make it more difficult to interpret schematics correctly. Re-drawing the circuit without the diagonals should make things more clear:

Original circuit (re-drawn)

Steps given here for solving: steps for solving circuit


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