Recent content by Pouyan

  1. Pouyan

    Complex circuit and its resistance

    @Delta2 , Steve4Physics, Orodruin I'm done! Now I know that I could draw the scheme just like this: $$\frac{1}{R_{Left}}=\frac{1}{20\Omega }+\frac{1}{15\Omega }$$ $$R_{Left}=\frac{60}{7}\Omega $$ Together with the right R that is 60 Ohm: $$R_{down}= \frac{60}{7}\Omega + 60\Omega $$ Parallell...
  2. Pouyan

    Complex circuit and its resistance

    @Delta2 I must say that my knowledge regarding circuit analysis is not sufficient and I want to read my book again ... I make examples that are inside the book, even simpler tasks, but when I get stuck and do not have access to a teacher, I turn either to the internet or if there is the...
  3. Pouyan

    Complex circuit and its resistance

    No! I read it and do not want anyone to solve my tasks, that's my job ... But some answers make me even more hesitant
  4. Pouyan

    Complex circuit and its resistance

    Thanks! $$R_{BC} =\frac{60}{7}\Omega $$ $$R_{BCD}=68.57\Omega$$ The total $$R=29\Omega$$
  5. Pouyan

    Complex circuit and its resistance

    Thanks for this it. But what about C and D? are they in series with each other?
  6. Pouyan

    Complex circuit and its resistance

    In the right part of A and D which is red; well the current to the left part of A is (12/50)A=0.24A and the same for D is (12/60)A= 0.2A The sum of these currents are 0.44A. Because A and D are parallel the R_AD = 300/11 Ohm; and 0.44 * 300/11 V = 12V. But is the current in the left part of A...
  7. Pouyan

    Complex circuit and its resistance

    You mean here: The current through the first branch is 12/50 A = 0.24A and the current through the last branch is 12/15A which is 0.8A And the total current is I=0.24A+0.8A=1.04A ?
  8. Pouyan

    Complex circuit and its resistance

    And you mean the same current is passing through those areas ?
  9. Pouyan

    Complex circuit and its resistance

    Yes, I know that at intersections we have different currents but got stuck on this task, If we start from the plus pole of the voltage source I know we have a total current I. At the first junction the current will split. But at point P, will the current split again?
  10. Pouyan

    Complex circuit and its resistance

    The true answer is : The voltage between P and Q is 1.5 V. I got stuck finding the total resistance. My question is: Is B parallel to both A and C? Is C parallel to D ? I tried many ways to find the total R but failed! My first attempt: I say the system ABD is in serie with C...
  11. Pouyan

    Which lamp is dimmed in the circuit?

    you mean that the current through B is negligible? or in other words it is so small that we can ignore it?
  12. Pouyan

    Which lamp is dimmed in the circuit?

    Thank you! But is B in serie with A,D,C or is in parallell ?
  13. Pouyan

    Which lamp is dimmed in the circuit?

    The true answer is B. But I dont understand why! I know: Kirchhoff's circuit laws : ∑In=0 If we assume that a current that goes from plus to minus, before it passes through lamp B, I know that according to Kirchhof's laws, part of the current will pass through the bottom path where there is no...
  14. Pouyan

    Clausius' theorem

    T ∑(dQi/Ti) =< 0 Is that correct to think dQi <=0 because it leaves the reservoir?
  15. Pouyan

    Clausius' theorem

    Would you explain please? :smile:
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