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Simple problem calculate total Resistance parallel

  1. May 24, 2016 #1
    1. The problem statement, all variables and given/known data
    I made this problem on my own.
    resistors are
    10 ohms
    30 ohms
    15 ohms

    they are in parallel connections between A and B points
    Voltage across A and B = 12 volts
    calculate Rtotal

    2. Relevant equations

    1/ R = 1/ R1 ´+ 1/R2 + 1/R3

    3. The attempt at a solution

    1/R = 1/10 +1/30 + 1/15

    1/R = 6/30 = 1/5

    R/1 = 30/6 = 5/1
    R= 5 ohms

    If the inverse of R = 6/30

    I guess then R itself should be inverse of (6/30) = 30/6

    I think I got the same result with the laborious method.

    1/R = 6/30 ]]]] * R
    1= 6R/30 ]]]] * 30
    30= 6R ]]]] / 6
    30/6 = R
    R= 5 ohms
     
  2. jcsd
  3. May 24, 2016 #2

    berkeman

    User Avatar

    Staff: Mentor

    I get 5 Ohms also. :smile:
     
  4. May 24, 2016 #3
    All what you write is mathematically correct but you just playing with algebra and the equation , especially in the last 5 lines of your post.
     
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