## Jone133 3 years ago Formulas for Q3? "For the last two parts assume I = 2A" Also, formulas for Q6 please :)

1. EngSara

q6 the formula 1-Vo* (R3-(B*R1*R3)+R1+R2+A*R2)/(R3-B*R1*R3)=VIN 2-i1=V0/(R3-B*R1*R3) 3- vo = vth but i don't know the RTH

Rth plzzzz

3. Jone133

Thank you Sara! I'm still missing Rth formula, and the 2nd part of Q3 ones...

4. Zozi

When I=2 v1 is 1,32 and v2 is 0,66

5. Jone133

Thank you zozi, but that seems to be wrong:c

6. Jone133

what formulas did you use? My Resistances are 1ohm

7. Zozi

just valculating v1, one 1 ohm and two serial resistors in paralel means a 0,66ohm resistor. From this U=I*R for v1 and for v0 its a half divider from two one ohm resistor...

8. benzo

sara do you mean I1= vin/(r3-b*r1*r3 vo=vin*(r3-(b*r1*r3)+r1+r2+a*r2)/(r3-b*r1*r3)

9. benzo

q6

10. JoãoVitorMC

Q6 Rth please Vin=18V, R1=1.5Ω, R2=3Ω, R3=4Ω, A=1.5 and B=0.5.

11. brunofornari

como vc fez o Q3, Joao?

12. JoãoVitorMC

eu achei aki as respostas para o meu

13. Jone133

Thank you once again zozi, it was v0= 0.666 and v1=1.32, it was the other way around Also, for you Joao Vitor, RTH = 3.6

14. benzo

jones what the formula for q6

15. brunofornari

are you sure abt that, Jone133?

16. Jone133

Yes, for I=2A on Q3 and for the values of JoaoMC on Q6

17. JoãoVitorMC

THANK YOU SOO MUCH!!

18. Jone133

RTH= Vth / ISC Isc= Current on short circuit

19. benzo

I1 Vo Vth Rth

20. JoãoVitorMC

but how did you calculate the Rth ???

21. JoãoVitorMC

Finally 100% \o/

22. Jone133

congrats! It's a great accomplishment, I hope I get 100% too on the final :D

23. benzo

24. brunofornari

Hey Jone133.. my values are: 10A and -3A for v0 and 5A for v1 and v0

25. brunofornari

Dá uma força com o 6 aí, joao?? =D

26. Jone133

I don't have formulas, sorry... I Only know that RTH = VTH / Isc and Isc is the current on short circuit. Zizo told me the values for Q3.

27. benzo

mc congrats q6 whats the formula

28. Jone133

para os valores de JoaoMC, Vo, I and Vth are 1.8 The formulas are on the 1st answer

29. benzo

ok I1 and vo

30. Jone133

also, vo = vth

31. JoãoVitorMC

Q6: Vin=18V, R1=1.5Ω, R2=3Ω, R3=4Ω, A=1.5 and B=0.5. 1.8 1.8 1.8 3.6

32. JoãoVitorMC

but still no formulas...

33. Jone133

For Q3 v0= 0,66*I/2 but if its over +/- 2V the zener cuts it to +/-2V (found zizo's answer on another question)

34. Jone133

Thank you Zozi!

35. Zozi

and v1 is 0,66*I

36. benzo

JoãoVitorMC u is the mannn thank u

37. JoãoVitorMC

welcome :)

38. JoãoVitorMC

i will post soon a topic here about solve all the Question 3 and others that i complete understant.

39. brunofornari

Eu vi que teu Rth deu o dobro do teu Vth.. posso assumir isso pro meu, será? meu vth tá em 7.5

40. JoãoVitorMC

acho melhor não arriscar não

41. JoãoVitorMC

espera até amanha, deve aparecer mais soluções

42. JoãoVitorMC

agora q acabei aki, vou trabalhar em como encontrar as respostas e irei postar aki o mais rapido possivel

Q3: p1 : zener voltage sholud be less than the given current so vo=2V which is zener voltage Q3: P2 : I1=( 0.66 * I ) . . . also find I2 = (0.33 * I) .. . Vo= I2 Q3: P3 : (a) I1=( 0.66 * I ) . . . also find I2 = (0.33 * I) .. . Vo= I2 . . (b) v1 = I1

what is Isc in Q6

45. JoãoVitorMC

Rth help plzzz

47. vivek2609

if you assume I=2A then the current through the parallel resistor will be 1.3333 A ant V1 will be(1ohm*1.333) 1.333V the remaining current flows through the zener diode its resistance will be 1ohm so v0 will be 0.667v

48. kaplko

anyone qno 4 part first equation????