pls teach me how find the total resistance

Discussion in 'General Electronics Chat' started by babyboyx, Jun 2, 2009.

  1. babyboyx

    Thread Starter Member

    Jun 2, 2009

    pls help me !! reall urgent ...
    i cnt think that whick is paralle to which one
  2. pilko

    Senior Member

    Dec 8, 2008
    Treat as a set of series.parallel circuits,as shown,starting with R7 and R8 in parallel with R6 and that group in series with R5.
  3. count_volta

    Active Member

    Feb 4, 2009
    R8 is in series with R7.... So R8+R7 is in parallel with R6. After that it just keeps repeating.

    The real question you should ask yourself is, do you understand what parallel means and what series means? If you don't, ask and we will gladly explain. ;)
  4. radiohead

    Distinguished Member

    May 28, 2009
    More than two resistors in parallel:

    1 + 1 + 1
    R1 R2 R3

    Two resistors in parallel:

    R1 x R2
    R1 + R2

    Resistors in series:

    Rt= R1 + R2 + R3 etc...
  5. babyboyx

    Thread Starter Member

    Jun 2, 2009
    thx guy it help a lot =]
    y ai noe wad series n parelle mean !!
    but sometime there too mana resistor make me blur
  6. Salgat

    Active Member

    Dec 23, 2006
    Haha nice, electron flow theory (which IMO is not incorrect but can be confusing for things like diodes). Just remember, break it up into sections of parallel resistors and from there find the parallel values and then add them all together.
  7. Zenock

    Active Member

    Jun 1, 2009
    Radiohead is of course right. However, the first equation can be applied to two resistors by dropping the...
    Off the end so it's good for any number of resistors in parallel.

    The second equation can be applied to more than two resistor but is more complicated...
    R1 x R2 x R3
    R1xR2 + R1xR3+R2xR3

    Basically you need every value on top and every possible combination of the number of resistors-1 on the bottom. Easier to just use the first equation.