Question

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Answer 1

Answer:

R1=5

R2=15

R3=2.25

Since,R1 AND R2 are connected in parallel and both of them are connected in series.

SO,

$\frac{1}{rp} = \frac{1}{r} + \frac{1}{r2}$

$\frac{1}{rp} = \frac{1}{5} + \frac{1}{15} \\ \\ \frac{1}{rp} = \frac{4}{15} \\ \\ rp = \frac{15}{4}$

NOW,

$re = rp + rs \\ \\ re = \frac{15}{4} + 2.25 \\ \\ re = \frac{15 + 9}{4} \\ \\ re = \frac{24}{4} \\ \\ re = 6$

SO, THE RESULTANAT RESISTANCE IS 6 OHM.

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