You are given several identical resistances each of value 
and each capable of carrying a maximum current of one ampere. It is required to make a suitable combination of these resistances of 5 
which can carry a current of 4 ampere. The minimum number of resistances of the type 
that will be required for this job is
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To carry a current of 4 ampere, we need four paths, each carrying a current of one ampere. Let 
be the resistance of each path. These are connected in parallel. Hence their equivalent resistance will be 
. According to the given problem 
or 
For this purpose two resistances should be connected. There are four such combinations. Hence, the total number of resistance
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