A few days ago, I read such a physics question and asked whether R1, R2, R3, and R4 are connected in parallel or in series?
In fact, doing this kind of problem is very simple, you just need to connect the points with the same potential, draw a diagram, and the result will come out.
Starting from the positive pole of the power supply, three roads are divided into three ways to point 1, respectively to R1 and R4, and the third road is divided into two roads after passing through point 2 along the diagonal line of the box, which are R2 and R3 respectively. From this, it can be determined that point 1 and point 2 are equipotential.
R then analyzes and finds that point 3 and point 4 are also equipotential (to put it simply, it is a point), so the other end of these four resistors is all connected to the negative pole of the power supply, so the four resistors R1, R2, R3, and R4 are connected in parallel.
The equivalent circuit diagram is the last one, with four resistors connected in parallel.
