About the second voltage induced by the first inductor, i think it should have a sign of +- because the current enters the dotted side of the first inductor then it should follow the sign
Hi again . this is the most info i can get out of book "Engineering Circuit Analysis" , year 1993 from publisher McGraw-Hill . Writing All Self terms is the same as with DC equation writing with NON coupled coils . Now , assuming 2 coupled coils , I2 flowing thru L2 gives an induced term of jwMI2 onto mesh I1 ( easy to realize ) . Next , using the Dot Convention with I2 Arrow and the Dot of L2 , we easily know the induced +-polarity onto L1 . Now we need to determine the correct +-sign of , jwMI2 . To find this +-sign , we use the same KVL traverse direction that was used when writing the Self term of L1 . Example : if we had Traversed L1 Clock-Wise and if we used the +-sign of L1 as we Entered L1 , then that is the same location we must use to pick the +-sign for the Induced term . Effectively , L1 will have 2 pair of +-polarities . +-pair One was used to write the Self term of L1 . the other +-polarity across L1 came from the Dot of L2 with I2's current Arrow direction, either entering the Dot or Exiting the Dot , of L2 . Example : + - is the +- pair across L1 , used when writing Self Term of L1 , Traversing\Entering L1 on the Left side , at the +plus , thus the Self Term of L1 is + ( + jwL1I1 ) , KVL is +pos and Ohm's Law is +pos if we determined the Induced +-polarity across L1 ( using L2's Dot with I2's Arrow direction ) as: - + , we need to use KVL Traverse in the same way that was used during the writing of L1's Self Term , thus we use - which is again Entering L1 from the Left side and the Induced term onto Mesh I1 is ( - jwMI2 ) , KVL only . I see nothing else the book is doing\saying . All the above can be done in One's head , with nothing extra to write on the diagram . Very implicite , once someone sees how to do it . Deriving the +-sign of the Induced Term does NOT use Ohm's Law , instead uses just KVL Traverse direction in the exact same way as performed when the Self Term of L1 was written . It is actually very simple to do , even though the book's sometime suggest otherwise . i have no issues wrting the initial mesh equations in Chapter 14 , of the above mentioned book . The initial mesh equations can easily be Directly wirtten with No intermediate steps, and No extra drawing on the diagram . what do you think ?
I have a question, why did in the first coil, the j4 was multiplied with I2-I1? And the second coil, why just multiply with I1? Can you elaborate a clear explanation? Tha
Trump 2016 I did that method which put the dependent source on the right of J2 and the sign was negative and positive which ha the value of J4(I1 - I2). The final answer is the same as his method putting the source where the dot is. I was confused at first but after watching many videos with different methods, I finally got it.
No, you can use 10/_0rad as the source, there's no need to add 90º. Lets say you find some voltage in the circuit wich is 7/_(pi/6), in the time domain this means 7cos(4t+pi/6), its just a phase shift.
I understand mutual inductance for a transformer would be isolated and circuit resembles a parallel look. What device is this? Why does it look to be in series?
why the technique of Inserting dependent source ? I don't get it . Write any KVL equation of resistors , and no one inserts a voltage source in place of IR ( we could , but no one does that ) . why not just write the two Mesh equations that each contain Self-terms( as normal ) with the Mutual-terms . That's how the good books do it . Your way , the circuit diagram needs to be messed with to draw in the dependent source . Too much overhead for that approach . I am NOT liking that technique . ISBN : 0-07-027410-X "Engineering Circuit Analysis" Fifth Edition 1993 , McGraw-Hill publisher .
Yes, you are correct, most textbooks do not redraw the circuit with dependent sources to model the induced voltages. As a student learning this material I often found it difficult to get the voltage polarities correct, and later as a professor found that showing the induced voltages explicitly as voltage sources made it easier for my students to arrive at the correct analysis of the circuit.
@@RoseHulmanOnline ok . I have found that much equation writing and analysis eventually involves a lot of implicitness . Example Reference :Node analysis , Nodes are labeled V1 V2 V3 , while each V node is + with the single Ref. node as -. +- are shown only during a First time explaining . After that , the books do NOT draw in those +- node pairs( everyone needs to Remember that ) . For Meshes , I only show I1 I2 I3 etc. in each Mesh window . I don't show the Arrows anymore, because each Arrow is implicitly known to be used in the Clock-Wise direction . It is not difficult , but eventually there are many things that become implicit , which need to be fully discussed at introductory level . When showing extra Steps , the reader should know that , that is NOT how they will eventually do it . The same circuit needs to be re-done in the implicit way . Other-wise some folks might get miss-lead in their analysis approach . You showed the analysis , but yet you don't actually do it that way. That can confuse and miss lead a First Timer . It needs to be followed by an implicit analysis so that everyone sees the real deal . The book I mentioned is very concise , Not perfect but it beats the other 2 top competing books . That book has a real Engineering approach to the discussions . The depth of technique is obvious , in the book . the other 2 competing books are : "Electric Circuits" 2nd Edition and "Basic Engineering Circuit Analysis" 4th Edition all 3 books are now in their 12th or so Editions . ( there is nothing new in the newest editions , so buy previous editions used )
@@You_Tube12355 I think some of the Techniques are NOT using the full concept of the "DOT Convention" , that is why some want to insert a voltage source . If a "Self inductance" term is + - , and we find that the "Mutial inductance" term is + - , then we know that the Mutual term "aids" the self term , and the Mutual term is written with a + . If we find the Mutual term opposes the +-polarity of the Self term , then the Mutual term is written with a -minus , for here the Mutual induced voltage acts to "reduce\opposes" the Self induced voltage There is No need to draw in\insert a "voltage source" depiction . Can you get a copy of this book : ISBN 0-07-027410-X "Engineering Circuit Analysis" Fifth Edition , 1993 McGraw-Hill publisher . It has International versions too . ( how many languages , I do not know ) That book has great depth .
DLA EUROPEJSKICH / POLSKICH SPOŁECZNYCH TEMATÓW TELEWIZYJNYCH: POLONAISE I MAZURKA ESSAYS, FILMY I INSTRUKCJE: PRZEJDŹ DO INTERNETU I SZUKAJ: ACADEMIA.EDU ......... ..RAYMOND CWIEKA OGŁOSZENIE !!! Z DNIA 9/1/2018 YUBE TUBE USUNĄŁ LICZNOŚĆ FILMÓW. NADZWYCZAJNIE FILMY ZOSTANĄ ZWRÓCONE NIEKTÓRY DZIEŃ! WYŚWIETLANIE FILMÓW WKLEJ FILM - SŁOWA - ESSAY DO DOKUMENTU WORD I NASTĘPNIE KLIKNIJ i NACIŚNIJ KLUCZ CTRL NA WIDEO. ORYGINALNIE BYŁO NIEKTÓRE 47 KSIĄŻEK. I ZASADA PRZEDE WSZYSTKIM, ALE STRONA AKADEMII.EDU WYDAŁO MISSPLACED WIELE Z NICH, WIĘC NIE MOŻESZ BYĆ WIDOCZNY. PONOWNIE, NADZIEJA NINIEJSZA SYTUACJA ZOSTANIE POPRAWIONA.
Searched all over the internet for this and finally found it
About the second voltage induced by the first inductor, i think it should have a sign of +- because the current enters the dotted side of the first inductor then it should follow the sign
your view helps us about circuit exam
Hi again .
this is the most info i can get out of book "Engineering Circuit Analysis" , year 1993 from publisher McGraw-Hill .
Writing All Self terms is the same as with DC equation writing with NON coupled coils .
Now , assuming 2 coupled coils , I2 flowing thru L2 gives an
induced term of jwMI2 onto mesh I1 ( easy to realize ) . Next , using the Dot Convention with I2 Arrow and the
Dot of L2 , we easily know the induced +-polarity onto L1 .
Now we need to determine the correct +-sign of , jwMI2 .
To find this +-sign , we use the same KVL traverse direction that was used when writing the Self term of L1 .
Example :
if we had Traversed L1 Clock-Wise and if we used the +-sign of L1 as we Entered L1 , then that is the same location
we must use to pick the +-sign for the Induced term .
Effectively , L1 will have 2 pair of +-polarities .
+-pair One was used to write the Self term of L1 . the other +-polarity across L1 came from the Dot of L2 with
I2's current Arrow direction, either entering the Dot or Exiting the Dot , of L2 .
Example :
+ - is the +- pair across L1 , used when writing Self Term of L1 , Traversing\Entering L1 on the Left side , at the +plus ,
thus the Self Term of L1 is + ( + jwL1I1 ) , KVL is +pos and Ohm's Law is +pos
if we determined the Induced +-polarity across L1 ( using L2's Dot with I2's Arrow direction ) as:
- + , we need to use KVL Traverse in the same way that was used during the writing of L1's Self Term , thus we use -
which is again Entering L1 from the Left side and the Induced term onto Mesh I1 is ( - jwMI2 ) , KVL only .
I see nothing else the book is doing\saying . All the above can be done in One's head , with nothing extra to write on the
diagram . Very implicite , once someone sees how to do it . Deriving the +-sign of the Induced Term does NOT use
Ohm's Law , instead uses just KVL Traverse direction in the exact same way as performed when the Self Term of L1
was written .
It is actually very simple to do , even though the book's sometime suggest otherwise .
i have no issues wrting the initial mesh equations in Chapter 14 , of the above mentioned book .
The initial mesh equations can easily be Directly wirtten with No intermediate steps, and No extra drawing on the diagram .
what do you think ?
Author name?
The method of using dependent voltage sources is very helpful. Thank you!
THIS VIDEO SAVED MY LIFE!
Should have been 3(I2-I1)+ j4I1 + jI2 + 1I2 + (-j)I2? I think you forget jI2 near j4I1 in the second equation.
I noticed that also
Yup but he fixed that right before finishing his equation.
How is the way you drew the dependent voltage source "Positive on the same side as the dot"?
Glad to hear you found it helpful!
thank you just one question when we signify dependant sources (+) must look to point is it right ? İt works always does it?
I have a question, why did in the first coil, the j4 was multiplied with I2-I1? And the second coil, why just multiply with I1? Can you elaborate a clear explanation? Tha
in mesh 2 dependent voltage should it not be j4(i1-i2) as it was done in mesh 1 .the reflection current due to mutual inductance is i2-i1
shouldn't be j4(i2-(-i1)) at the first dependt source? because i1 is negative on the way with no point in 1/4H...
Great, glad to hear that it was helpful to you.
thank u for clarifying the polarity!
On the j2 inductor, what if the dot was on the right, meaning i1 is exiting the dot. Would that mean the middle dependent source would be -j4?
Trump 2016 I did that method which put the dependent source on the right of J2 and the sign was negative and positive which ha the value of J4(I1 - I2). The final answer is the same as his method putting the source where the dot is. I was confused at first but after watching many videos with different methods, I finally got it.
Very clear explanations here ,thank you for the video.
I think you missed a J2(I2-I1) in the 2nd loop equation
Hello could you test this software? Locate circuit solver on the playstore!
one mistake you did in second equation. you forgot to consider inductance ( +j) ,(situated in the middle of circuit).
nalini jatwar He fixed it right there, please watch the video until the end.
excellent procedure and result.
the voltage source is in "cos" so fasor notation must be 10/_90 ??
No, you can use 10/_0rad as the source, there's no need to add 90º. Lets say you find some voltage in the circuit wich is 7/_(pi/6), in the time domain this means 7cos(4t+pi/6), its just a phase shift.
in 1/4 F, when i use (1/WC)j im getting (1/4*0.25)j = 1j not -1j... how are you getting -1j?
Gift Tsundukani Mashavani The "j" is part of the denominator, as in 1/(j*wc), and 1/j = -j
My hero! You saved me from my ass-some university
Thank you! This helped me a lot :)
you putted the signs of dependent source wrong
I understand mutual inductance for a transformer would be isolated and circuit resembles a parallel look. What device is this? Why does it look to be in series?
thank u so much u make it super easier for me
why the technique of Inserting dependent source ? I don't get it . Write any KVL equation of resistors , and no one inserts a voltage source in place of IR ( we could , but no one does that ) .
why not just write the two Mesh equations that each contain Self-terms( as normal ) with the Mutual-terms .
That's how the good books do it . Your way , the circuit diagram needs to be messed with to draw in the dependent source .
Too much overhead for that approach .
I am NOT liking that technique .
ISBN : 0-07-027410-X "Engineering Circuit Analysis" Fifth Edition 1993 , McGraw-Hill publisher .
Yes, you are correct, most textbooks do not redraw the circuit with dependent sources to model the induced voltages. As a student learning this material I often found it difficult to get the voltage polarities correct, and later as a professor found that showing the induced voltages explicitly as voltage sources made it easier for my students to arrive at the correct analysis of the circuit.
@@RoseHulmanOnline ok . I have found that much equation writing and analysis eventually involves a lot of implicitness . Example Reference :Node analysis , Nodes are labeled V1 V2 V3 , while each V node is + with the single Ref. node as -. +- are shown only during a First time explaining . After that , the books do NOT draw in those +- node pairs( everyone needs to Remember that ) . For Meshes , I only show I1 I2 I3 etc. in each Mesh window . I don't show the Arrows anymore, because each Arrow is implicitly known to be used in the Clock-Wise direction .
It is not difficult , but eventually there are many things that become implicit , which need to be fully discussed at introductory level . When showing extra Steps , the reader should know that , that is NOT how they will eventually do it . The same circuit needs to be re-done in the implicit way . Other-wise some folks might get miss-lead in their analysis approach . You showed the analysis , but yet you don't actually do it that way. That can confuse and miss lead a First Timer . It needs to be followed by an implicit analysis so that everyone sees the real deal .
The book I mentioned is very concise , Not perfect but it beats the other 2 top competing books . That book has a real Engineering approach to the discussions . The depth of technique is obvious , in the book .
the other 2 competing books are :
"Electric Circuits" 2nd Edition and "Basic Engineering Circuit Analysis" 4th Edition
all 3 books are now in their 12th or so Editions . ( there is nothing new in the newest editions , so buy previous editions used )
If we don't use dependent source we get same result ..Does it requires to use dependent source as point of view as marks
@@You_Tube12355 I think some of the Techniques are NOT using the full concept of the "DOT Convention" , that is why some want to insert a voltage source .
If a "Self inductance" term is + - , and we find that the "Mutial inductance" term is + - , then we know that the Mutual term "aids" the self term , and the Mutual term is written with a + .
If we find the Mutual term opposes the +-polarity of the Self term , then the Mutual term is written with a -minus , for here the Mutual induced voltage acts to "reduce\opposes" the Self induced voltage
There is No need to draw in\insert a "voltage source" depiction .
Can you get a copy of this book :
ISBN 0-07-027410-X "Engineering Circuit Analysis" Fifth Edition , 1993 McGraw-Hill publisher . It has International versions too . ( how many languages , I do not know ) That book has great depth .
@@240mains book ki soft copy hay to bhejo sir please..
This helped me a lot!!!!!
The second equation is wrong
Erick Millan It is correct. I try different method and the final answer is the same (verified).
Enfim eu entendi essa matéria! Bela explicação!
DLA EUROPEJSKICH / POLSKICH SPOŁECZNYCH TEMATÓW TELEWIZYJNYCH: POLONAISE I MAZURKA ESSAYS, FILMY I INSTRUKCJE: PRZEJDŹ DO INTERNETU I SZUKAJ:
ACADEMIA.EDU ......... ..RAYMOND CWIEKA
OGŁOSZENIE !!! Z DNIA 9/1/2018 YUBE TUBE USUNĄŁ LICZNOŚĆ FILMÓW. NADZWYCZAJNIE FILMY ZOSTANĄ ZWRÓCONE NIEKTÓRY DZIEŃ!
WYŚWIETLANIE FILMÓW WKLEJ FILM - SŁOWA - ESSAY DO DOKUMENTU WORD I NASTĘPNIE KLIKNIJ i NACIŚNIJ KLUCZ CTRL NA WIDEO.
ORYGINALNIE BYŁO NIEKTÓRE 47 KSIĄŻEK. I ZASADA PRZEDE WSZYSTKIM, ALE STRONA AKADEMII.EDU WYDAŁO MISSPLACED WIELE Z NICH, WIĘC NIE MOŻESZ BYĆ WIDOCZNY. PONOWNIE, NADZIEJA NINIEJSZA SYTUACJA ZOSTANIE POPRAWIONA.
Thanks for the great video
Gracias ! Thank you !
👍👏
thank youuu
yr explaination is not understandable...as it looks like u r practising by yrself...
حبيبتي ماتت وكان ليها مكان ف قلبي جوا مليان احزان قتلتها بعد ما ختنها قوام حب الله مش ز حب نسوان