1. The problem statement, all variables and given/known data I am confused here . Each wire is of resistance R How in this image E G and D are at the same potential and in this image How A and F and Dand G are equivalent? 2. Relevant equations I dont think any equations will be used in solving this but I guess V =IR might be 3. The attempt at a solution In the first image what I figured out is since the points E G and D are at one resistor drop from H so they are at the same potential but I am not able to figure out in the second situation I am taking help of this website http://physicstasks.eu/uloha.php?uloha=285 but its quiet confusing I JUST WANTED TO KNOW WHATS THE METHOD BEHIND FINDING POINTS WITH EQUAL POTENTIAL IN SUCH CASES ?