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Resistance help

  1. Oct 30, 2006 #1
    what is the smallest resistance that can be obtained by using onlu a 3 ohm resistor and a 12 ohm resistor??

    can anyone please tell me why the answer is 2.4ohm??????

    i calculATED USING 1/3 = 1/2 AND I GOT 4 OHMS:mad:

    thx anyway
  2. jcsd
  3. Oct 30, 2006 #2


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    Okay, if the resistors are placed in series the effective resistance of the system is simply the sum of the individual resistances (i.e. [itex]R_{t}=3+12=15\Omega[/itex]).

    However, if we place the resitors are placed in parallel the effective resistance of the array is....?
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