A student has two resistors 2 ohm and 3ohm .Suppose R1 and R2 are another resistors and R1 has vaule 4ohm and she has to put one of them in place of R2.Assuming R1 and R2 are in parallel ,the current that she needs in the entire circuit is exactly 9A.Show by calculation which of the two resistors she should choose?
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Answer:
When two resistors of resistances R1 and R2 are connected in parallel, the net resistance is 3Ω. When connected in series, its value is 16Ω.