# Recent content by Pouyan

1. ### 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. ### 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. ### 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. ### Complex circuit and its resistance

Thanks! $$R_{BC} =\frac{60}{7}\Omega$$ $$R_{BCD}=68.57\Omega$$ The total $$R=29\Omega$$
5. ### Complex circuit and its resistance

Thanks for this it. But what about C and D? are they in series with each other?
6. ### 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. ### 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. ### Complex circuit and its resistance

And you mean the same current is passing through those areas ?
9. ### 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. ### 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. ### 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. ### Which lamp is dimmed in the circuit?

Thank you! But is B in serie with A,D,C or is in parallell ?
13. ### 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. ### Clausius' theorem

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