Question

write a equivalent resistance between A and B? ​

Answer 1

All 2ohm resistance are in series so, R = 6*2 = 12ohms

Now, 4ohms and 12 ohms are in parallel so Equivalent resistance is

$\frac{1}{R_{eq}} = \frac{1}{4} + \frac{1}{12} \\ \frac{1}{R_{eq}} = \frac{12 + 4}{48} = \frac{16}{48} = \frac{1}{3}$

$R_{eq}= 3ohms$