Question

answer fast plzzzzx​

Answer 1

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4 ohm and 12 ohm are connected in parallel.

$\implies \frac{1}{r} = \frac{1}{4} + \frac{1}{12} \\ \\ \implies \frac{1}{r} = \frac{3 + 1}{12} \: \: \: \\ \\ \implies \frac{1}{r} = \cancel\frac{4}{12} \: \: \: \: \: \: \: \: \\ \\ \implies \frac{1}{r} = \frac{1}{3} \: \: \: \: \: \: \: \: \: \: \\ \\ \implies \boxed{r = 3} \: \: \: \: \: \: \: \: \: \:$

now,

total resistance = 3ohm + 7ohm

➪ total resistance = 10ohm