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Ayman El-Hag - Electrical Engineering for Everyone
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Добавлен 14 июн 2008
Welcome to my Electrical Engineering Channel. My main goal is to talk to different people who have common interest in electrical engineering like: undergraduate and graduate students, researchers and engineers. To achieve this goal I will try to cover wide spectrum of topics in electrical engineering like exam problem solving, practical and simulation demonstrations, short courses and important concept clarification. So I hope anyone who is interested in electrical engineering will find something of interest to him/her in my channel.
PEO solved examples (ELEC A1): DC Analysis Question no. 8
This question is from ELEC A1, May 2022 exam. The question is about DC analysis using nodal analysis. The question has the concept of super node where you have a voltage source between two ungrounded nodes. Also, power balance in the circuit between the power supply and the power absorb is verified.
#peoexam #nodalanalysis #circuitanalysis #circuit
#peoexam #nodalanalysis #circuitanalysis #circuit
Просмотров: 258
Видео
PEO solved examples (ELEC A1): Thevenin Equivalent Question no. 3
Просмотров 402Месяц назад
One question from PEO ELEC A1 December 2022 exam. The question about finding the Thevenin equivalent of AC circuit and then calculate the maximum power transfer. The question was answered using source transformation. correction: At 4:06: Zth = 8.544 - j0.04 At 12:58 Pmax = Vth^2/(4R) when the voltage is given as rms but Pmax = Vth^2/(8R) if the voltage is given as peak value. Since the voltage ...
Differential amplifier vs instrumentational amplifier
Просмотров 128Месяц назад
In this video the difference between differential amplifier and Instrumentational amplifier is discussed. The focus is on their application in instrumentation and measurement For the derivation of the differential amplifier output, you may watch: ruclips.net/video/wD3twN_e6hA/видео.htmlsi=B5wy6IdlQMma9YA5 starting from 4:16 For the derivation for the instrumentational amplifier output, you may ...
PEO solved examples (ELEC A1): Transient analysis Question no. 3
Просмотров 259Месяц назад
One question from PEO ELEC A1 May 2017 exam. The question is about solving first order transient question (inductor question) using the step by step method. For similar questions, you may watch the following videos: ruclips.net/video/nmY2hqkTfek/видео.htmlsi=m-NB0gbMDMZRu_Z3 ruclips.net/video/ULX07oCptL0/видео.htmlsi=tG2xNSjxAbNabfYr ruclips.net/video/CBzJ75ebXOs/видео.htmlsi=uQJVDdxVUXm06TAe #...
PEO solved examples (ELEC A1): Second Order Transient Analysis Question1
Просмотров 243Месяц назад
This is a question from PEO exam ELEC A1 in December 2020. This is a second order transient question that involves both a capacitor and an inductor. To solve this problem, you need to use Laplace and Laplace Inverse. #peoexam #circuit #laplacetransform
PEO solved examples (ELEC A1): DC Analysis Question no. 7
Просмотров 244Месяц назад
This question is from ELEC A1, May 2022 exam. The question is about DC analysis where it was not specified the technique that needs to be used to solve the question. I used circuit reduction and current division to solve the question. Also, power balance in the circuit between the power supply and the power absorb is verified.
PEO solved examples (ELEC A1): Power Calculations - Question no. 1
Просмотров 3512 месяца назад
This is a question from PEO ELEC A1 exam in December 2022. The question is about power calculations when more than one load is connected. Also, the question is about calculating the line losses, voltage drop, line current before and after adding a power factor correction load. #peoexam #powerfactor
PEO solved examples (ELEC A1): DC Analysis Question no. 6
Просмотров 3652 месяца назад
This is a nodal question from PEO ELEC A1 exam offered in December 2022. The question includes both dependent and independent energy sources. This is the sixth DC analysis question and the 3rd nodal analysis question. #peoexam #circuit #nodalanalysis
PEO solved examples (ELEC A6): Synchronous Machines no. 2
Просмотров 1962 месяца назад
This question is from ELEC A6, December 2022 exam. It is about analyzing the synchronous generator under single line to ground fault. This involves the use of positive, negative and zero sequency components. #peoexam #synchronousmachine
PEO solved examples (ELEC A6) Three Phase Question no. 4
Просмотров 1392 месяца назад
In this video part of the theoretical question related loads from PEO ELEC A6 exams are discussed. Two questions where answered: The first question is about reactive power and low power factor and the second question is about harmonics. For more details about these topics you may watch the following videos: Power triangle: ruclips.net/video/eluBYPq5690/видео.htmlsi=ZGgl8RiwVgV0s-9r What is reac...
PEO solved examples (ELEC A6): Transformer Question no. 4
Просмотров 1742 месяца назад
In this video part of the theoretical question related to transformers from PEO ELEC A6 exams are discussed. Two questions where answered: The first question is about operating the transformer under different voltage, current and frequency ratings. The second question is about eddy current losses and transformer core. For more information about using the transformer at different frequencies: ru...
PEO solved examples (ELEC A6) Three Phase Question no. 3
Просмотров 2012 месяца назад
One question from PEO ELEC A6 December 2022 exam. The question is about how to analyze the power system using the power triangle. #peoexam #power #reactivepower #powerfactor
PEO solved examples (ELEC A6): Transformer Question no. 3
Просмотров 2112 месяца назад
One question from PEO ELEC A6 December 2022 exam. The question is about finding the shunt components, Rc and Xm in the transformer model. #peoexam #transformers
PEO solved examples (ELEC A6) Three Phase Question no. 2
Просмотров 2092 месяца назад
One question from PEO ELEC A6 May 2021, 2022 and December 2022 exam. The question is about how to analyze the power system using the power triangle. More details about the power triangle can be found in the following video: ruclips.net/video/eluBYPq5690/видео.htmlsi=iE7yfcSBeSkZxE4e #peoexam #power #reactivepower #powerfactor
PEO solved examples (ELEC A1): DC Analysis Question no. 5
Просмотров 3342 месяца назад
This question is from ELEC A1, December 2022 exam. The question is about DC analysis where it was not specified the technique that needs to be used to solve the question. I used circuit reduction, source transformation and nodal analysis to solve the question. To watch questions that cover these topics, kindly watch these videos: Delta - Y conversion: ruclips.net/video/b6wajdq_Cq8/видео.htmlsi=...
PEO solved examples (ELEC B7) Three Phase Question no. 1
Просмотров 2613 месяца назад
PEO solved examples (ELEC B7) Three Phase Question no. 1
PEO solved examples (ELEC B7) Transmission Line Question no. 2
Просмотров 1563 месяца назад
PEO solved examples (ELEC B7) Transmission Line Question no. 2
PEO solve examples (ELEC B7) Synchronous Generator Question no. 1
Просмотров 1993 месяца назад
PEO solve examples (ELEC B7) Synchronous Generator Question no. 1
PEO solve examples (ELEC B7) Symmetrical Fault Question no. 2
Просмотров 1263 месяца назад
PEO solve examples (ELEC B7) Symmetrical Fault Question no. 2
PEO solve examples (ELEC B7) Power Flow Question no. 1
Просмотров 2063 месяца назад
PEO solve examples (ELEC B7) Power Flow Question no. 1
PEO solve examples (ELEC B7) Transmission Line Question no. 1
Просмотров 2644 месяца назад
PEO solve examples (ELEC B7) Transmission Line Question no. 1
PEO solve examples (ELEC B7) Symmetrical Fault Question no. 1
Просмотров 1994 месяца назад
PEO solve examples (ELEC B7) Symmetrical Fault Question no. 1
PEO solve examples (ELEC B7) Transformer Question no. 1
Просмотров 3914 месяца назад
PEO solve examples (ELEC B7) Transformer Question no. 1
PEO solve examples (ELEC A6) Magnetic Circuit Question no. 2
Просмотров 2274 месяца назад
PEO solve examples (ELEC A6) Magnetic Circuit Question no. 2
PEO solved examples (ELEC A6) Induction Motor Question no. 1
Просмотров 3604 месяца назад
PEO solved examples (ELEC A6) Induction Motor Question no. 1
PEO solved examples (ELEC A6) DC Motors Question no. 2
Просмотров 2324 месяца назад
PEO solved examples (ELEC A6) DC Motors Question no. 2
I'm on my 5th career, and coincidentally, many of them involve resonance ruclips.net/video/sLE9mNKeUIw/видео.html
Hi sir parallel combinatin value of 7+j14 and 8-j12 is shown different @ 3:26 and 8:15 of the video.could you please explani sir
The PEO fall exam will be on October 28, Could you arrange short videos to cover the main topic of the material ?
My plan is to start from first week of September.
One question came to my mind? What is the basis of using this criteria of partial derivaties and then summing it? Any specific reason, Sir?
In Question 4 of May 2019 paper, for the thevenin equivalent circuit question, there is a voltage dependent current source (4Vo) in parallel with an inductor (j4). Can we apply source transformation to that?
Any current source (dependent or independent) in parallel with an impedance (resistor, capacitor or inductor) can be transformed to a voltage source in series with this impedance.
@@electrical4everyone Dear Sir, so the equivalent voltage source would be j16Vo ? if i'm not wrong? Will we take impedance angle into account? or is it gonna be just 16Vo?
Thanks doctor for these wonderful lectures.. Best I have reviewed this far on the web
You are welcome
Much appreciated 👍
You are welcome
What you said at 21: 26 " If we change the variable from 1.7 to 1.5 it will not converge" , i din't get this point. Could you please explain it Sir?
In the current equation, it will always converge but if we change the formula from 0.7sin(x) to 1.5sin(x), the partial derivative will be higher than 1 and hence it will not converge.
@@electrical4everyone Thank you Professor. Allah bless you
Can we not solve RTD second order equation by simple quadratic formula?
Sure you can do that, but we are trying to apply numerical method techniques because the RTD can have higher order polynomial, and hence it will be harder to solve it using simple mathematical formula. Also, it is important to compare numerical solutions with closed form ones to check the correctness of the numerical approach.
Wonderful short video ...much thanks
You are welcome
Hi Professor, Vgs should be modified by multiplying it with 1/(1+gm*Rs). Can you elaborate on this part how did you come up with this expression. I get that that the Vgs is expression you came up with is incorrect but don't really follow how to correct it.
Vgs is the voltage between the gate and the source and the source is not grounded and hence there is a voltage drop between the source and the ground which is equal the current source (gm*Vgs) and the resistance Rs. This is why we need to do this modification.
If the same force is applied to the two springs, shouldn't both of them have the same stored energy
It will depend on the elasticity of the spring, and not just the applied force and this is the example I used to describe why if you apply the same voltage to two different materials with different dielectric constants will have different stored energy.
For (d) Vc= -1.328V with BJT in saturation Can you confirm this?
Secondly, for the part (e) it is kinda tricky to apply assumption on two BJTs and solve using KCL could you help with the answer for this.
For part (e), my calculations show Q2 to be in active mode and Q1 to be in cutoff mode, my question here is if we have cuttoff mode that means Ic is zero if Ic is zero then I think we have Vc1 as 5V. When you have time can you confirm.
@@HaiderAli-rm6rd Hi, I will try to solve these two questions in couple of weeks as currently I'm on vacation.
Great explentation. Thank you
You are welcome
Hello, these videos are great for me! Thank you. is there a way I can get a copy of the exam questions? I'm writing this exam in the fall/winter. Thank you
Hi Kindly send to me an email with your request and I will respond to you.
@@electrical4everyone I just. sent you an email, thank you!
Hi Professor, Can you confirm if the load has lagging p.f. the generator is over excited. Everywhere that I am trying to confirm this it states for a lagging load p.f the generator would be underexcited.
For the generator we do not specify if the generator is over or under excited. We just specify the load power factor.
@@electrical4everyone Hi professor, so is it the opposite if we talk about the synchronous machines instead of the synchronous generator?
You mean synchronous motors and yes the motor is opposite to the generator.
Hi professor, would you mind helping us to solve the A1 PEO question of Dec 2019 , Q6? Thank you so much!
Q6 is about Laplace application. As an advice it will be better to concentrate on the other 5 questions as they belong to fundamentsl of circuits. Laplace is considered an advance topic. Nevertheless, I will try to solve this question.
@@electrical4everyone Thank you professor. Understood and really thank you so much for your advice. A1 and A6 seems still easy to pick up......But B7 is much more difficult, especially we do not know the question type after 2019......Seems the PEO has made the exam much more difficult than the undergraduate exam ~
Thank you Dr for your very important content for electrical engineering
This is really nice content! Thanks a lot , it is so good 😮
You are welcome, if you have any feedback to improve the content, please let me know.
Thanks ! Great content, it is so nice and altruistic to help other engineers with the exams! Bless you!
Hi Professor, When you are able to find some time power system engineering B7, would you be able to provide some more solved questions for B7?. For example where you solved for missing Voltage can you solve for missing angle.
Secondly, is the newtow raphson method sufficient to solve all type of questions of this nature.
The plan is to start B7 early September. I will provide videos to describe the theory for each question and then solve questions about this topic.
Yes NR can solve any load flow question
I see that the Zequiv between : 8-j12 and 7+j14 should be 14.92angle(-0.47) instead, then Zth=8.544-j0.04, Thanks.
Thank you for your feedback, you are right, I added the correction in the video description
Hi professor, I believe the Zth= 8.544-j0.04
Thank you for your feedback, you are right, I added the correction in the video description
Thank for the explanation, just wondering why do you include the 2mA source for the inductor in position B? Thanks.
At t=0 the inductor will maintain the same current just before the switch move. So it will be modeled as a current source
hi, can you send me the question papers please from 2020 and so on ?
Yes I can, what is your email?
sinx =cos (90-x) right. here you did sinx =cos (x-90). hw is it correct?
cos(x) = cos(-x), so both equations are correct.
For the second mesh loop, would it be okay to use only I1, I2 and I3 rather than using all 4 considering how I4 was already captured in the first mesh loop?
To select a loop for a kvl you need to avoid any current source in that loop. So for loop 2 I took the most outer loop. I could take the loop without the last branch
At the end of the video Pmax was calculated using the formula for AC voltage V^2/8R, but I always thought that for RMS values the formula is the same as for DC, V^2/4R. Did I get it wrong?
Thanks for the correction, you are correct. I wrote a correction in the video description.
@@electrical4everyone Salam alaykom Dr, Thank you so much for perfect teaching. is Voc 80.94<67.49 ?
Hi Professor, I believe Zth=8.544-j0.04, can you double check please?
Thank you. If we analyze the 3 loops (excluding I = 2mA) and 3 unknowns. I found i1 = 5mA, i2 = 7mA, i3 = 3mA. However, i1 should be 2mA. Could you please review this?
Hi, I1 is already given to you, so, you only have two unknowns, I2 and I3, You need only to apply 2 KVL equations in loop 2 and loop 3
Thank you for the clear explanation. I'm just wondering, in what cases do we use the RMS value, and in what cases do we use the peak value?
If you use rms as input sources then all voltages and current you calculate is rms and if the input is peak then every thing is peak. We usually use the rms for power calculation questions.
Hi Professor, For the first example, my waveform Vout for negative portion of Vin is comming out to be like a positive waveform. I have added it a link here drive.google.com/file/d/1qrg0-1voU6yqnODlvazfmnSwSnkH4pij/view?usp=share_link. The plot is done with F(X)= -X-2.3. Can check if something is off here
I have noticed the samething in the second example as well. I think I have not ignored the -ve sign with Vin for the negative waveform that is why the difference in the output wave form
Crazy good explanation, dear sir.
Thanks for making the videos!! If possible then can you please solve Thevenin's question from 2022 exam.
Done, here is the link: ruclips.net/video/KD2lYM-9Rrs/видео.html
@@electrical4everyone Thank you very much!!
@@isandipp You are welcome
God bless you sir!
Thank you professor, that is a very clear and easy to follow explanation of the power triangle.
You are welcome
Thank you! Quick question: if we don't have the Wheatstone bridge, what technique would you use to get I2?
You may use nodal analysis, you will have 3 nodes with unknown voltages and you need to create 3 equations to solve for these 3 node voltages
This was so awesome and helpful. Thank you!
You are welcome
I'd like to thank you so much Prof. Ayman, I'm studying the A1 from your videos, they are amazing, and my exam is within the next two weeks. please do you have any videos for Elec A4? or any other subjects for the Electrical Engineering PEO?
Hi Thanks for your nice words. I have playlists in my channel for: A5: electronics A6: power system and machines B7: power system analysis. Unfortunately, I do not have background for A4.
You’ve covered everything, this is so good Jazakallah khair
Jazak Allah khair for your nice words.
Thank you so much professor.
You are welcome
Hi Professor, If time allows another example of second order transient analysis with initial conditions would help for sure.
This is in my plan hopefully this week.
@@electrical4everyone Thanks. I also wanted to know if you have any plans in the future to cover topics related A5 (Electronics) or a guide on what topics need to covered for A5.
@HaiderAli-rm6rd I already have one playlist about A5 ruclips.net/p/PLDkq31epwdjx_ALhPPYEv4E6RdYSbIDYq&si=823FqGX55bH_xa0l
@@electrical4everyone Thanks Professor. I will go through it first. I just found it in the playlists as well.
Jazakallah khairan professor for covering this topic as well.
Thank you professor for solving a second order problem. Can you please solve a first order problem with inductor not capacitor? I appreciate your support.
I will do that soon in cha Allah
Hey Professor, I am finding this playlist extremely helpful for preparation of PEO exams. Would you be able to do a couple of examples where we have use laplace transformation. Transient analysis on a circuit with capacitor and inductor.
Hi I just solved one question about transient analysis containing both a capacitor and an inductor. Here is the link: ruclips.net/video/smw5N8GS8fM/видео.html
@@electrical4everyone Thank you so much. This is really helpful.
You are welcome. Any other question you want me to solve? I will solve first order transient but with inductor
I think you have already solved such an example in this video ruclips.net/video/ULX07oCptL0/видео.htmlsi=kPFKQYVGlnwqBT4C but if you find any different or slightly tricky example, please add a video for it when you are able find sometime. I think your playlist for A1 covers essentially all different types of questions
@@HaiderAli-rm6rd but it was not a peo question
Thank you Professor, may Allah reward you immensely for your effort. Jazakallah.
JAK for your nice words
شكرا جدا يادكتور لولا الله ثم شرحك المفصل في حلول اسئلة A6 ماكنت حليت في الاختبار جالنا سؤالين من الاسئله اللي حليتها وفقرتين من الاسئلة النظريه
هذا من فضل الله وحده
Dear Dr. EI-Hag, there is a calculation error in 18:55 about the capacitance C, the value should be 0.232mF. The required impedance will be 11.41 Ohm.
Thanks for your feedback, I added the correction to the video description.
Thank you, well explained!. I wonder why the Pout calculated=76.95kW is not close to 100HP*746=74.6kW? Thanks.
100hp is the motor name plate value. Pout is the actual output power at the given conditions that may or may not match with the name plate values.
Thank you for the clear explanation, just a quick question, Why isn't P(copper)= P(Short circuit)? if system is at rated conditions?
The losses we have in the short circuit test is done on a different side of the transformer, so there is a^2 = 4 factor different between the two losses.
And the current in the source=Iab is =1.47 (angle 32 ? Thanks
Correct, this will be the phase current in the supply.