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Combined Circuit Problem

  1. May 25, 2016 #1
    1. The problem statement, all variables and given/known data
    14jpx0n.jpg

    2. Relevant equations
    IR=V
    series circuit
    Vt = V1 + V2 + V3...
    It = I1 = I2 = I3...
    Rt = R1 + R2 + R3...

    parallel circuit
    Vt = V1 = V2 = V3...
    It = I1 + I2 + I3...
    Rt = 1/R1 + 1/R2 + 1/R3...

    3. The attempt at a solution
    i honestly have no idea where to start. may someone pls help me?
     
  2. jcsd
  3. May 25, 2016 #2

    phyzguy

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    Can you identify any resistors which are in series and can be combined?
     
  4. May 25, 2016 #3
    is 2 and 4 in a parallel circuit as well as 3 and 5?
     
  5. May 25, 2016 #4
    Here is something which helped me a lot when I was solving circuits
    "Analyse how he current flows.If you find the same current going into different resistors they are in series,If different current flow flow through them they are in parallel"
     
  6. May 25, 2016 #5
    i'm not sure how to tell that apart.
     
  7. May 25, 2016 #6

    phyzguy

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    When the current reaches the bottom end of resistor 5, where will it go?
     
  8. May 25, 2016 #7
    back to resistor 1?
     
  9. May 25, 2016 #8

    phyzguy

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    No. I mean the bottom end of 5, in the lower right corner. The current flows down through 5, and then where?
     
  10. May 25, 2016 #9
    oh to resistor 4?
     
  11. May 25, 2016 #10

    phyzguy

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    Right. And then when it leaves 4, where does it go?
     
  12. May 25, 2016 #11
    resistor 3 and when it leaves 3, it goes to 2? and when it leaves 2, it goes to 1?
     
  13. May 25, 2016 #12

    phyzguy

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    Not quite. When it leaves 3, there are two places it can go. But, looking at sidt36's post #4, what can you say about 3, 4, and 5?
     
  14. May 25, 2016 #13
    3, 4, and 5 are parallel to each other. does that mean that 1 and 2 are series?
     
  15. May 25, 2016 #14

    phyzguy

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    No! Read sidt36's post again.

    No.
     
  16. May 25, 2016 #15
    is it the opposite?
     
  17. May 25, 2016 #16

    phyzguy

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    I'm not going to do the problem for you.
     
  18. May 25, 2016 #17
    yes, i understand that but i don't get what makes a circuit a series or parallel.
     
  19. May 25, 2016 #18
    upload_2016-5-26_8-24-15.png

    Try making a diagram like this and check where the the current is going
     
  20. May 25, 2016 #19
    And I hope you dont mind if I ask which grade you are in because this should be pretty trivial for 10th grade student
     
  21. May 25, 2016 #20
    i am in 10th grade and i recently just learned this
     
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