quick resistor question

Discussion in 'General Electronics Chat' started by skinner927, Jan 31, 2008.

  1. skinner927

    Thread Starter Active Member

    Dec 31, 2007
    36
    0
    can resistors work like addition or are they more like golf (a 5 iron and a 4 iron wont equal a 9 iron)

    ok, here's the question. I need a 30K ohm resistor, can I just use 3 10K ohm resistors one after the other?

    thanks.
     
  2. arthur92710

    Active Member

    Jun 25, 2007
    307
    1
    yes, in series(end to end, in a line)
     
  3. skinner927

    Thread Starter Active Member

    Dec 31, 2007
    36
    0
    thank you.
     
  4. nomurphy

    AAC Fanatic!

    Aug 8, 2005
    567
    12
    Resistors are additive/subtractive. In series they increase in value, whereas in parallel they decrease in value.

    Series:
    Rt = R1 + R2 + ...Rn
    30K = 10K + 10K + 10K
    30K = 5K + 10K + 15K

    Parallel:
    Rt = 1 / (1/R1 + 1/R2 + ...1/Rn)
    30K = 1 / (1/90K + 1/90K + 1/90K)
    2.73K = 1 / (1/5K + 1/10K + 1/15K)
     
  5. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    144
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