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  1. bibo_dvd

    Torque on a Triangular Loop

    hello guys iam doing my homework in magnetic fields course and i found this problem i solved (a) and (b) by using F=I L x B and the total force on the triangular loop would be zero but in (c) i tried alot to find the torque on the loop but i couldn't get the same result so please help me...
  2. bibo_dvd

    Engineering [Help] with Numbering System Digital Circuit

    Hahahah ..i think ..it depends on the base we are using , Berkeman :biggrin:
  3. bibo_dvd

    Engineering [Help] with Numbering System Digital Circuit

    This was the first chapter of Digital Circuits ..an Introduction for binary and other numbering systems ...this was the first section of the course :D and if 3 * 6 = 22 then 3 * 6 = 2+2x then base = 8 :))
  4. bibo_dvd

    Engineering [Help] with Numbering System Digital Circuit

    [Help] with Numbering System "Digital Circuit" Hello Guys .. iam having an exam on digital circuits and i try to work on some problems about numbering systems and i found this problems but i couldn't solve it .. i said that (x-3)(x-6)=x^2-11x+22 then i said that...
  5. bibo_dvd

    A problem with diode limitters

    you mean that the output waveform will equal zero in the positive half and in the negative half it will equal -10v-0.7v ?? or what ??
  6. bibo_dvd

    A problem with diode limitters

    okay i know that , but i still don't know how will i calculate Vout i think Vout will be = -10+0.7= -9.3v .. is that right ??
  7. bibo_dvd

    A problem with diode limitters

    okay in the + input the diode will be reverse biased so the current will not pass , but in the case of - input the diode will be forward biased and the current will pass am i right ??
  8. bibo_dvd

    A problem with diode limitters

    hello guys while studing the diode limitters i found two examples i solved the first one but i couldn't with the second 1 - 2- in the first i know that the diode while be forward biased in the negative half of the signal so the negative half will be limitted to -0.7 v...
  9. bibo_dvd

    How can i put the polaritiy of E thevenin's ?

    okay that's mean that we can turn the symbol of the battery if we turned "a" and "b" in the other side ?? i mean if we put b in the upper right side and a in the lower right side ?? :)
  10. bibo_dvd

    How can i put the polaritiy of E thevenin's ?

    Hello guys .. i need your help with something in this photo i understand the way to calculate R thevenin's and the way to calculate E thevenin's but i couldn't understand why did we put the polarity in this way ?? i mean why can't we put switch the polarity of the battery ...
  11. bibo_dvd

    Engineering Problem with circuit analysis

    thx guys this helped me alot :)
  12. bibo_dvd

    Engineering Problem with circuit analysis

    hello guys i have been trying to solve this problem for a long time but i couldn't so i need your help.. iam trying to analyze the circuit using mesh analysis so i converted the current so to voltage source E=2*10=20V i don't know how to redraw the circuit taking this shape...
  13. bibo_dvd

    A problem with zener limtting output voltage

    hello guys !! i know that in zener diode limitting circuit there are three types : 1-limitting Positive peak 2-limitting Negative peak 3-limtting both peaks and i know that output voltage for limitting positive peak =VZ+0.7v limitting negative peak= -VZ-0.7v but i don't know what will...
  14. bibo_dvd

    A question about reciprocity theorem

    hello guys :)) the question is : in (a) IT= 10/[4k||8k+4k||4k]=2.14 mA but i can't calculate I so please guys help me i tried many times to get it but i couldn't :( thx guys !!
  15. bibo_dvd

    A problem in Coupling Transformers

    I think the potential across the load resistor will be the same but with an opposite sign i mean that the voltage will take this shape ..am i right ??
  16. bibo_dvd

    A problem in Coupling Transformers

    Hello Guys !! While Studing coupling transformers i found this problem i tried to solve it but i don't know if my solving is right or no !! so tell me :) The problem : My solve is : V(out)=nV(in) V(out)= 2 * 312 = 624 v PIV = V(out) = 624 v and if the diode is...
  17. bibo_dvd

    Nodal Analysis , Can't Understand the direction of a current

    Nodal Analysis , Can't Understand the direction of a current !! In This Question "Nodal Analysis" we will apply kirchoff's current law .. My Question is : Why in Fig 8.51 and 8.52 the currents take these directions ?? i tried to get it but i couldn't Photos : Thanks...
  18. bibo_dvd

    Engineering Which Law should i use to analyze this circuit ?

    okay iam trying to apply KCL by myself so please tell me am i right or not ?? I3 = I4 + I5 +I7 + I8 so 4 A = 0.5 I8 + 0.25 I8 + (1/3) I8 +I8 so I8 will be 3.7 A i feel that i'm very stupid :shy: i don't know the right way to apply KCL here
  19. bibo_dvd

    Engineering Which Law should i use to analyze this circuit ?

    We Didn't take applications on KCL yet but i tried to apply it on simple circuits and i found it easy but i don't know how to apply it on this circuit so please tell me :))
  20. bibo_dvd

    Engineering Which Law should i use to analyze this circuit ?

    okay .. this is the exact question and the exact statments which are required i want to know how to get I8 because i don't know which law should i use to find ??
  21. bibo_dvd

    Engineering Which Law should i use to analyze this circuit ?

    okay .. R′= R4 || R5 ||(R7+ R8) = 4 Ω ||8 Ω ||(6 Ω+ 2 Ω) = 4 Ω ||8 Ω ||8 Ω= 4 Ω ||4 Ω= 2 Ω R′ ′ = (R3+ R′) ||(R6+ R9) = (8 Ω+ 2 Ω) ||(6 Ω+ 4 Ω) = 10 Ω ||10 Ω= 5 Ω RT= R1 ||(R2+R′ ′ ) = 10 Ω ||(5 Ω+ 5 Ω) = 10 Ω ||10 Ω= 5 Ω I=E/RT = 80/5=16A I across R2=I/2 =8A I3 = I9 = 4A Then I8...
  22. bibo_dvd

    Engineering Which Law should i use to analyze this circuit ?

    Which Law should i use to analyze this circuit ?? Hello Guys !! Sorry i have many questions because iam not a professional in this .. My Question is : in this photo i found that the total Resistance is : 5 ohm and the total current is 16 A and I3 = I9 = 4 A and I8= 1 A I...
  23. bibo_dvd

    Engineering A Question about Series-Parallel Circuits

    Hello Guys !! In This photos i found that in (a) : RT= 4 Ω+ 10 Ω+ 4 Ω= 18 Ω and in (d) : RT= 10 Ω but i can't understand why in (a) the total resistance equals to 18 and how will the current would pass ?? and in (d) i can't understand why the total resistance equals to 10 and why we...
  24. bibo_dvd

    A Question about Voltage Sources in Parallel

    Hello Guys !! My Question : in this photo i found That Total Resistance will be = 7 ohm . and I2 = 12 / 7= 1.71 A and I1 = 0.5 * I2= 0.5 * 1.71= 0.85 A I can't understand why I1= 0.5 I2 ?? and why it isn't the same of I2 ?? here is the photo Thank you Guys !! :))
  25. bibo_dvd

    A Question about Kirchoff's Voltage Law

    Hello Guys My Question about Kirchoff's Law is : why in this Example we considered that E2 is a Voltage Drop not a Voltage Rise ?? i mean why we didn't say that : +E2-V1-V2+E2=0 ??? and Thanks Guys :)) !!
  26. bibo_dvd

    Engineering A Question in Voltage in a Circuit

    hello guys !! iam new at this forum and i have a question :)) The quesion is : why can't i calculate V7 from Ohm's Law So V7=E/R7 and it will be equal to 72/9=8V Please answer me and thank you guys :)
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