find equivalence resistance....

Discussion in 'Homework Help' started by gaurav1292, Oct 1, 2009.

  1. gaurav1292

    Thread Starter New Member

    Oct 1, 2009
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    [​IMG]


    calculate d equivalent resistance b/w d terminals of d cell. d resistance of each quadrant 1.e blue one is 1 ohm and that of intersecting diameter i.e green one is 2 ohm.


    i tried by distributing current in various branch but was not successful. plz tell me a way to solve this problem.
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    I did it by re-drawing the circuit in a clearer format.

    Then I used delta-star transformations to reduce the network to a form where simple series-parallel rules can be applied.

    I calc Rtot seen by source is 2.6471 Ω
     
  3. syed_husain

    Active Member

    Aug 24, 2009
    61
    5
    hi, tnk,

    i tried to solve with mesh equations. i got the same answer but the problem is it i had to solve 4 equations with 4 unknown. i tried 2 use thevemin but failed. could u pls tell me how did u do delta-Y transform?

    thnx.
     
    Last edited: Oct 1, 2009
  4. Tesla23

    Active Member

    May 10, 2009
    318
    67
    Draw a line of symmetry through it at 45° then the resistance is

    2 * (0.5 + 2||(1 + 2||0.5)) = 45/17 = 2.6471

    where a||b = ab/(a+b) - parallel resistors
     
  5. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Hi Syed,

    Tesla123's method is clearly the most elegant and succinct.

    If you are not sure how he did it and/or are still interested in my longer method I have included an attachment.
     
  6. syed_husain

    Active Member

    Aug 24, 2009
    61
    5
    tesla23 and tnk, thank u very much 4 ur help. i really appreciate it.

    Syed
     
  7. gaurav1292

    Thread Starter New Member

    Oct 1, 2009
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    0
    thanks for ur help!!!!!!!!!!!
     
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