### 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) =7+(10) =17 Kohms |

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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