A set of n equal resistors, of value R each are connected in series to a battery of emf E and internal resistance R. The current drawn is I. Now, the n resistors are connected in parallel to the same battery. Then, the current drawn from battery becomes 10I. The value of n is [NEET 2018]
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When n equal resistors of resistance R are connected in series, then the current drawn is given as
where, 
equivalent resistance of n resistors in series and r = internal resistance of battery.
Given, 
… (i)
Similarly, when n equal resistors are connected in parallel, then the current drawn is given as
where, 
equivalent resistance of n resistors in parallel.
Given, 
… (ii)
Substituting the value of 
from Eq. (i) in Eq. (ii), we get
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