Question
Sun July 17, 2011 By:
 

2 exactly similar heating resistances are to be used to connect across a main supply to heat some water. Is more heat obtained per minute if they are connected in series or in parallel? Give reasons for your answer.

Expert Reply
Mon July 18, 2011
Resultant resistance in a series combination is greater than any individual resistance, and resultant resistance in a parallel combination is smaller than any individual resistance.
 
since HR; so more the resistance, more the heat. Therefore, the resistances must be connected in series to obtain more heat per minute.
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