Question
Fri June 15, 2012 By: Kiran Kumar
 

What is the minimum resistance which can be made using 5resistors each of 1/5 ohm?

Expert Reply
Fri June 15, 2012
In a parallel connection the total resistance is always less than the minimum amount of resistance in the parallel circuit. It is so because:
consider a netowrk of tro resistances a and b connected in parallel.
Let b<a.
Their equivalent resistance will be
Now,
Thus clearly minimum resistance is obtained on parallel connections.
thus minimum resistance that can be made is by parallel connections between the five resistances, i.e. 1/25 ohm
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