Discussion :: Series-Parallel Circuits - General Questions (Q.No.9)
|Nandini said: (Oct 30, 2011)|
|Can you explain the answer?|
|Nandakishor said: (Jan 12, 2012)|
|Since parallel combination of resisitor is lees than least resistance . therefore parallel combination of 20 36 45 is less than 20. for this combination a series resistance of 7 is added .max answer is less than 20+7=27 there c and d options are not correct . a is also not correct because 7+anything is greater than 7.
There fore the correct answer is 17 which is option B.
|Prasanna said: (Aug 19, 2012)|
|RT = R1 + ( 1/R2 + 1/R3 + 1/R4)
= 7+(1/20 + 1/36 + 1/45)
|Revathi said: (Dec 12, 2012)|
|The equivalent resistance for resistors connected in parallel is 1/Re = ((1/R2)+(1/R3)+(1/R4)).|
|B Nagendar said: (Feb 26, 2015)|
|In parallel resistors 1/R = (1/R2+1/R3+1/R4).|
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