Question

Two resistors when connected in series, their effective resistance is 9 ohm. Their effective resistance become 2ohm when they are connected in parallel. Find the value of the resistors.​
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Answer 1

Answer:

4.5 is this questions answer

Answer 2

Explanation:

resistors assumed R1 AND R2

series resistance 9 -----A

Parallel Resistance 2----B

in series resistance R1+R2=9

IN parallel resistance R1×R2/(R1+R2) = 2

THEREFORE R1×R2=18

SO R1=18/R2 -------C

C in A

R²2 + 18= 9R2

R²2 -6R2 -3R2 +18=0 (FACTORISING)

R2 (R2- 6) -3(R2 -6)=0

So

R2=6 THEREFORE R1=3

OR

R1=3 THEREFORE R2=6

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