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You are given several identical resistors each of value 5 $Ω$ and each capable of carrying a maximum current of 2 A. It is required to make a suitable combination of these resistances to produce a resistance of 2.5 $Ω$ which can carry current of 4 A. The minimum number of resistances required for this job is

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Detailed Solution

If each carrying a current of 2 A a parallel combination of two will be capable of carrying a current of 4 A. Equivalent resistance of two in parallel will be 5/2 =2.5 $Ω$ .

So two resistance need to be connected in parallel to meet the requirement given.

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