rvc
  • rvc
@hartnn help
Physics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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rvc
  • rvc
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hartnn
  • hartnn
(v-12)/68 + v/37 + (v-4)/90 = 0 samja ye?
hartnn
  • hartnn
then, voltage drop across R1 will be v-12

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rvc
  • rvc
yep
rvc
  • rvc
i dont know norton :(
hartnn
  • hartnn
is the answer -7.82?
hartnn
  • hartnn
|dw:1446283622372:dw| total current passing through any node of the circuit is always = 0 so i1+ i2 + i3 = 0 got this? this is basics
hartnn
  • hartnn
kirchoff's current law i guess
rvc
  • rvc
hmm
hartnn
  • hartnn
|dw:1446283817708:dw| now i2 is easiest, ohm's law, (v-0) = i2 * R2 i2 = v/68 got this?
rvc
  • rvc
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hartnn
  • hartnn
voltage drop across R2 is just = v which we indeed got as 4.18
hartnn
  • hartnn
(v-12)/68 + v/37 + (v-4)/90 = 0 v =4.18
rvc
  • rvc
yup
hartnn
  • hartnn
from ohms law only, i1 = (v1 - 12)/R1 i3 = (v1 -4)/ R3
rvc
  • rvc
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hartnn
  • hartnn
and then kirchoff's current law gives, i1 +i2 +i3 = 0 thats how i got (v-12)/68 + v/37 + (v-4)/90 = 0 which is correct given v =4.18 is correct option for voltage across R2
hartnn
  • hartnn
thats a basic thevenin problem...where are you stuck... first you can combine 100 and 68 Rs in series to give 168 ohms
rvc
  • rvc
yup as they are in series
rvc
  • rvc
Rth is 168
rvc
  • rvc
oh pellet i did not see the question properly
rvc
  • rvc
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rvc
  • rvc
what about this
hartnn
  • hartnn
|dw:1446284799051:dw|
rvc
  • rvc
yep yay suniye 4th ka Rth i gt as 70 ohm
rvc
  • rvc
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hartnn
  • hartnn
4th is which one ?
rvc
  • rvc
upar wala karo pleosa
hartnn
  • hartnn
superposition waala? since choices are given, you're free to choose any method right? or do you want to learn superposition and do it in that way only?
hartnn
  • hartnn
i am asking because norton is way easy (v-12)/120 + (v-6)/120 +v/120 = 0 you get v = 6 and then i = v/120
rvc
  • rvc
konsa bhi karo im doing with which im comfrtable
hartnn
  • hartnn
same thing, i1 + i2 + i3 = 0 here i1= (v-12)/120 i2 = v/120 i3 = (v-6)/120 got these?
rvc
  • rvc
so 50mA?
hartnn
  • hartnn
yusss
hartnn
  • hartnn
but samja kya?
rvc
  • rvc
yo
hartnn
  • hartnn
norton is my favourite theorem i always used norton in MCQs for gate exam prep
rvc
  • rvc
hehehe norton bit confusing
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rvc
  • rvc
Rn 154 ?
hartnn
  • hartnn
yup :) short the voltage source 68||68 = 34 120+34 = 154
rvc
  • rvc
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hartnn
  • hartnn
and i meant to say "Nodal analysis", not norton :P
rvc
  • rvc
lol upar waale ka kya aa raha hai?
hartnn
  • hartnn
V across R2 nikaalna hai bas then I_N = V across R2 / RN i got 245mA
hartnn
  • hartnn
V_N = V across R2 = 75/2 I_N = V_N /R_N
rvc
  • rvc
245mA,correct?
hartnn
  • hartnn
yes :)
rvc
  • rvc
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hartnn
  • hartnn
superposition +12 -10
rvc
  • rvc
kya?
hartnn
  • hartnn
|dw:1446285961613:dw|
hartnn
  • hartnn
superposition theorem ka statement samja hai ?
rvc
  • rvc
2ma
hartnn
  • hartnn
yup
hartnn
  • hartnn
10 is taken as negative because it is in opposite direction
rvc
  • rvc
yup sorry
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rvc
  • rvc
ye false hai na
hartnn
  • hartnn
false because its the equivalent short-circuit current between the points
hartnn
  • hartnn
open-circuit se current jaayega hi kaise lol
rvc
  • rvc
lol

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