Lecture 16 I Question Discussion on Thevenin & Norton I Part 01 I Network Theory I GATE

[@GeniqueEducationTeam]

G saviour - To connect with pankaj sir join telegram - t.me/pankajshuklasir

[@arghadeepmandal4399]

We need equivalent Resistance right? So ideal voltage source has zero resistance which can be implemented by SC and ideal current source has infinite resistance which can only be implemented by OC

[@prateeksingh5180]

We short circuit the current source as in an ideal voltage source resistance is 0. And in current source we want infinite resistance so we open the circuit.

[@abhitechnocrat9833]

When we want to count equivalent resistance then we have to convert all independent sources to their internal resistance in ideal view .So voltage source would be short & current would be open.

[@jitendrasinghbhadoriya153]

Thevnien voltage is practical voltage source & norton current is practical current source ,so by considering the open & short circuit we calculate the value of resistance that will be connect in series / parallel with voltage/current source ...

[@mohit6355]

to deactivate voltage source the value of voltage became zero as we know that v=ir , r=o means s.c Similarly current became zero when r=infinite means o.c

[@ParmodSaharan]

Bcz if we want equivalent Resistance so... Voltage source have Zero internal resistance so we can take it is as a short ckt... Current source have infinity internal resistance so we can take it is as a open ckt... 😎😋

[@smrutipragnyadash2143]

We make voltage source sc and current source oc because; for ideal voltage source internal resistance is zero and for ideal current source it is infinity. So here basically we are replacing the sources with their internal resistances.

[@AJEETElectricals1988]

DC machine lecture me apake pnane ka attitude bahut achha laga

[@vikasverma-qt7gu]

Very nice sir.. We put ideal voltage source at short circuit because it's resister should be 0 and we put ideal current shorce as open circuit because it's resistance should be infinite .

[@ANURAGKUMAR-dx6tp]

Internal resistance of voltage source is 0 in Ideal Voltage Source & Internal resistance of Current Source is infinite in ideal current source.That's why we are replacing the voltage source by short circuit & current source by open circuit..!

[@shrivastavalallujee]

Because ideal voltage source has zero internal resistance and ideal current source has infinite internal resistance so voltage source is Short and current source is open circuit.

[@SonuKumar-qn2vn]

total resistance of the ckt will be the series parallel equivalent of VS ,CS and other resistances connected in the ckt therefore to find total equivalent resistances we need to calculate the internal resistance of VS and CS also together with other resistances.hence VS and CS are made dead (VS-SC and CS-OC).

[@ashut_vats]

ऐसा इसलिए करते हैं क्योंकि तुलना हमेशा एक जैसी वस्तुओं की होती है तो अगर आपको प्रतिरोध की बात करनी है तो जो भी ऊर्जा स्रोत लगे हुए हैं उनको उनके समकक्ष प्रतिरोध से प्रदर्शित करना पड़ेगा अन्यथा ये तुलना या समतुल्य प्रतिरोध की गणना सम्भव नहीं है।

[@effectivevoiceindia418]

To find equivalent resistance, practical independent sources are considered as ideal sources and we already know that ideal volage source has zero internal resistance & ideal current source has approximately infinite internal resistance, that's why to equivalent resistance voltage source is short circuited & current source is open circuited. But in case of dependent sources this thing does not happen. They are replaced by their internal resistances.

[@shubhamraha699]

bcoz we place the internal resistance of current and voltage source so we do oc and sc

[@बात_UP_बिहार_की]

Open circuit = infinite resistance for as ideal current source Short circuit = zero resistance for an ideal voltage source

[@justanotheranonymousbeing]

While calculating the eq resistance across any terminal, we have to take into mind all the available resistances in the circuit. So leaving all other resistances as it is, talking about the ideal independent VC and ideal independant CS, the resistance of Independent VS is zero while that of independent CS is infinite. This means which can SC and OC respectively

[@sangam3228]

Since we are calculating the Req we replace all other independent sources by their resistance therefore the resistance of independent voltage source is zero and the resistance of independent current source is infinite.

[@anjalibharti790]

Sir, yhan when load ke across koi bhi quantity nikalte hai to hmm sources ke across internal resistance ko neglect kr sakte hai so that voltage source ko short circuit krenge and current source ko open circuit

[@AnujPal-xj9ou]

Sources are deactivated bcz power absorbed by resistance shpuld be equal to power delieverd by independ sources..

[@ABHISHEKKUMAR-wg9ys]

as we coverting whole ckt in its equivalent resistance so as voltage source has zero resistance then short ckted and current source has infinite resistance so open ckted

[@kashish8541]

to nulify the effects of individual voltage and current sources on the resistances, as we know accoring to superposition principle independt voltage sources and current sources have their independents effect differently Ans we are required to find the resistances faced by volage and current source when connected across the terminals, also can only be done by short circuiting the voltage source and open circuit in case of independent current sources as they have infinite resistances.

[@adarshgupta1203]

As we know thevenin and Norton theorem are a practical source so in thevenin to find resistance, voltage source should be s/c that mean V = 0 . In this way we find resistance of the ckt.and Norton case current source should be open.

[@Elite_Engineer]

Sir basically we have to calculate equivalent resistance of ckt so volatge source and current source also have some resistance to take them into count we make it the way voltage source short and current source open

[@tarunsinghal3971]

The main purpose is we are converting our network into a practical voltage source, which consist only open circuit voltage in series with resistance

[@arunmukhiya1149]

WE are assuming ideal volatge & current sources so we do sc of voltage sources and open cuurent sources

[@priya03_94]

Sir mutual coupling nd resonance ki v videos upload krein pllz sir

[@rajibdutta2544]

To neglect resistances​ associate with the voltage source and current source

[@RahulKumar-ts1yk]

For making the passive network we deactivate the all independent sources

[@pravakarmohapatra5735]

Sir open ckt current and short ckt voltage are zero they have no effect on resistance r .without this factor we can find the value of R

[@pranavkumar1482]

While we deactivate the sources we replace at the place of source by their internal resistance. Since in case of oc current source having infinite resistance and voltage source having zero resistance a/c vi characteristic,

[@kashish8541]

elaborate please

[@tribhuwanpal9884]

sir deu to in ideal voltage source have internal resistance is zero but In ideal current source have internal resistance is infinite

[@kashish8541]

correct

[@mukeshkumarmahto9347]

ideal voltage source has zero resistance and ideal current source has infinite resistance thats way we replace voltage source by by short circuited and current source by open circuited respectively.

[@jkelectrosolutions7737]

Dear sir, Rth gets disturbed when practical sources haveing Internal resistance are connect ed while calculating Rth. So we generally remove the sources that izz THEIR INTERNAL RESISTANCES WHILE CALCULATING Rth. Sir plzz rectify me if I m wronggg😀😀😀😀😀

[@twinkle6884]

Jub independent source ko hatate h to unke internal resistance se replace kr dete h ideal voltage source ka zero hota h aur ideal current source ka infinite hota h So....

[@abinashdash3450]

If we do voltage source open circuited and current source short circuited ,then what is the meaning of finding the Thevenin resistance.. Indirectly the voltage source and current source are present (when we do V.S (OC) and C.S(SC) ) So we do V.S short-circuited and C.S open circuited

[@abinashdash3450]

Pankaj sir....is it the correct explanation ?

[@shibamsarkar8765]

Sir voltage source 0 means voltage across it zero, and voltage 0 means short circuit, And current 0 means open circuit

[@ee-tn5ln]

By s.c of voltage source means there is no response of the voltage in the circuit. By o.c of current source means no response of current in the circuit.... At finally by O.C and S.C the network transform to the pure passive network.... Please give the answer for your questions sir at finally we can conclude it....

[@nitish_mishra3175]

Coz when we short the voltage becomes zero and in open circuit current becomes zero and we just want to calculate the equivalent resistance without considering and supply that how much resistance is available in the ckt so that's why we follow this rule

[@kashish8541]

yeah basically we want to solve the values independently without any interuption

[@kailaskrishna4385]

Actually the independent sources are replaced by their internal resistances and ideal vtg source has 0ohm resistance and ideal current source has infinite ohm resistance

[@ketansharma1603]

While deactivating the sources, we replace the sources with their internal resistance. The voltage source has zero resistance and current source has infinite resistance. So. V.S replaced by O.C and C.S. is replaced by S.C.

[@umerashraf992]

V.S replaced by S.C...

[@subhamsingh8610]

ideal voltage source has no resistance and c.s. has infinite resistance.

[@dilipkumar1393]

If we will not it vs sc and cc oc then no deactivation done

[@intertainment7804]

Thank you sir

[@DilipKumar-ru2mk]

Bcoz ideal current source having infinite internal resistance and ideal volttage source having zero internal resistance thats why current source is open circuitet and voltage source is short circuited while finding equivalent resistance of a network. Short circuit= 0 resistance Open circuit= infinite resistance

[@jayaranjan8640]

Because voltage source ka internal resistance 0hota h and current source ka inter. Resistance infinite hota h

[@gokulmahapatra749]

Because super position theorem

[@shushantgambhir2002]

sir aapka content acha hai but mismanaged hai. like, ek toh logo wala part beech mein naa dalein plz video k aur plz video k names mein lecture 16 ki jagah sabse aage topic name likhein. u can be superhit!!!! good luck

[@ramgovindp6886]

You are God sir😍❤️❤️❤️

[@santoshkumar-ij9kj]

Due to linear and bilateral

[@pasumarthisaiteja5696]

Sir while applying kvl the current flowing through 2m ohm should be considered as -2ma no sir

[@forcompetitiveexam5041]

voltage rise ho raha hai +2ma hoga...thik hai wo

[@shwethak6895]

Sir, in case 1 the value of PL is (64/36) microwatt na?

[@Hero123-w9v]

No

[@Hero123-w9v]

mW

[@EEAnkitKumarPal]

Yqh

[@nynuks5918]

We applied super position theorem