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Homework Help: Resistors, parallel line notation?

  1. Dec 14, 2011 #1
    I was looking at an answer regarding resistors, and saw the notation;

    R = R1 + R//
    1/R// = 1/R2 + 1/R3

    I was wondering what the two parallel lines after the R indicate?

  2. jcsd
  3. Dec 14, 2011 #2


    User Avatar

    Staff: Mentor

    It's just a clever choice of variable name. The [itex]||[/itex] is meant to convey the meaning "parallel", as it does in mathematical notation.

    Parallel resistors are combined by the formula indicated, that is,

    [tex] R_{||} = \frac{1}{\frac{1}{R_1} + \frac{1}{R_2} + ... + \frac{1}{R_n}} [/tex]
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