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What's the difference between series an parallel components in the pictures

  1. Feb 15, 2017 #1
    hi;
    When I study - if we want to connect impedance in the case of: - we connect the R4 and (R1+(R2||R3)) as parallels
    upload_2017-2-15_18-33-5.png

    but when we want the get impedance of C and R of the right: - we connect that as series: Z(of C)+R .. why the different? please help!
    upload_2017-2-15_18-37-10.png
     
  2. jcsd
  3. Feb 15, 2017 #2

    phinds

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    Because inductance and resistance are different things and you cannot combine them as exactly the same the way you can when everything is just resistances.
     
  4. Feb 15, 2017 #3

    berkeman

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    In the 2nd circuit, it's not clear what you are trying to solve for. In general, that circuit will not combine down to a simple component or two. Could you label the different components with different numbers (so each resistor has a different number, etc.), and ask what you would like to be able to solve for in the circuit?
     
  5. Feb 15, 2017 #4
    upload_2017-2-15_18-57-18.png
    I want to find a simple arranged of total impedance on the
    different circuit 1 (all R) and 2 (with the C and L).


    in case 1 told me that R4 and (R1+(R2||R3)) as parallels. and in case 2 impedance R1 and impedance C is series. but I think about it if I will connect something to the Terminals the connection of R1 and C is like a Δ transform with R2 no?

    (may that matter what the purpose of tow cases - case 1 what the total R , and case 2 what the transfer function. If that matter i want to know why)
     
  6. Feb 15, 2017 #5

    berkeman

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    The impedance for circuit 2 looking into which 2 nodes? It makes a difference... :smile:
     
  7. Feb 15, 2017 #6

    phinds

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    No. Please reread post #2 and try to understand it.

    Do you understand that the impedance of inductors and capacitors depends on the frequency, whereas the impedance of a resistor does not?
     
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