Very simply circuits question

Discussion in 'Homework Help' started by de1337ed, Feb 25, 2012.

  1. de1337ed

    Thread Starter New Member

    Mar 6, 2011
    I haven't taken circuits in a very long time, and now I have to take this course. I just have a quick question about a small circuit:

    I was just wondering if Resistors R1 and R2 have been shorted out and don't have any affect on the circuit. I'm trying to find the resistance that's seen through the voltage source... And from what I understand, it should only be R3 because R1 and R2 have been shorted... Is this correct?
    Thank you
  2. Wendy


    Mar 24, 2008
    They are out of the circuit, they might as well not exist.

    High frequencies are trickier, but I'm assuming basic DC electronics.
  3. PNeil

    New Member

    Oct 27, 2010
    You are correct.

    R1 and R2 are shorted out of the circuit and thus bypassed. Only if you break the circuit at the upper left hand corner will R1 and R2 be in the circuit and thus be in series with R3.

    No current flows through R1 and R2 so they have no effect on the circuit.