Question

4. Calculate the equivalent resistance between points A and B.
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Answer 1

Answer:

If you carefully observe A & C are at the same potential and B & D at the same potential. If you can re-draw the resistors they all will be in parallel with each other (6Ω||6Ω||6Ω)

$\frac{1}{R_{AB}} = \frac{1}{6} + \frac{1}{6} + \frac{1}{6} = \frac{3}{6} = \frac{1}{2}\\\\R_{AB} = 2 ohms$