Need help solving resistor network problems

  • Thread starter junior_J
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  • #1
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this isnt so much of a homework question . Im having trouble with identifying and calcultaing effective resistence for parallel or series connected resistors particularly ones that are very complex to even understand whats going on .... I did look through various websites and books looking for answers but ended up finding nothing .... my book listed 2 examples of the kind but these were poorly explained :(

this is not so much of a homework problem, but ive been having trouble solving these questions (2 days in a row )..... are there any ways or say tips i could use to tackle these problems ??? websites ive missed , books i might have to glance through ?? (but mainly helpful websites ...)

thanks in advance .
junior
 

Answers and Replies

  • #2
berkeman
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When you can, use series & parallel combinations of resistors to simplify the circuit. Once you're done with the simplifications, write the KCL (or KCL) equations for the nodes, and solve for the node voltages.
 
  • #3
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the problems Im dealing with right now dont even mention emfs or pds .... they say something to the effect " Find the effective resistence between x and y " ... and in between x and y lies a jungle of resistors . I can't even comprehend how theyre put together ...
 
  • #4
berkeman
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Well, it's physical, so it's solvable. Can you post a copy of the drawing?
 
  • #5
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there are many of these problems ..... I just want to learn how to do this .... errm if ud do it for me Ill get off the hook pretty easy

Can u just tell me how ud go about solving these ??? may be tips/pointers or something like that

teach a man how to fish blah blah proverb comes to mind :)
 
  • #6
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.... will i have to draw this one on mspaint ???? really .... !!
Im not jokin around ..... i googled for these problems , nothin came up ....
 
  • #7
berkeman
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Sometimes you can use a symmetry in the problem to help out. Like with R-2R ladders used in DAC circuits, for example. Either you can simplify with parallel-series combinations, or use a symmetry, or you just have to brute force it with KCL. If all the resistors have the same value or related values, that generally helps with the symmetry arguments.
 
  • #8
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My physics book doesnt even go as far as to properly describe how to do these .... Ill be damned if i ever open that book again !!!!!!!

anyways ur not getting through ... i have a thick skull !!!!

thanks.
 

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