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Homework Help: Resistance series and parallel

  1. Nov 25, 2011 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations

    series - Ra+Rb

    parallel - 1/[(1/Ra)+(1/Rb)]

    3. The attempt at a solution

    Im positive that R1,R2 y R3 are parallel, but also (R5+R8), R9 and (R10+R4) right? is R7 parallel to anything? which ones would be series??? so confusing... thankies :]
  2. jcsd
  3. Nov 25, 2011 #2


    User Avatar

    Staff: Mentor

    These 3 branches are parallel branches.
    R7 is not. It is in series with a voltage source.
    Two branches are in series if [all of] the current that flows through one also then flows through the other.
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