Please take this as a compliment...I seriously think DISNEY should give you your own STEM show. The explanations and drawings in your videos are so informative and logical you can inspire many young people. Thanks for your passion to educate!
OMY LORD!! If you are like me and just coming to this page to look for help in electrical theory for testing for a job...Listen to me this man is a freaking GENIUS!! I just went and looked at his video playlist..WOWIE!!! I am about to take the technical college entrance exam too... Boy am I glad that I found you because that exam has TRIGonometry and I am really going to need these videos!! I have been to a lot of really tutors on you tube but dude you truly are a GENIUS...Like how do jam all of this into your brain?? It is TRULY AMAZING!!! YOU ARE TRULY AMAZING!!!
Wow!! I just found this channel while I was looking for some detailed explanation of AC properties. You have put out A MOUNTAIN of lessons, and everything I've seen is paced really well for a beginner. It's easy to do small skips when you're covering something I know. People like you make TH-cam SO valuable. Thank you for producing all of this amazing content
AC/DC power and the the topics that you are lecturing, your have given me inspiration, already a few short videos from you have been great. I'm going to watch all of your lectures and I am confident you'll be key to getting me to where I want to get to
sir thankuu so much...i'm a physics student from india and and having a test tomorrow :( i didn't know i would find so helpful videos like this one on youtube ,,,,,,,,,,,,,,,,,thankuuh so much i understood so much and now i think i could do better in test....thankuuh so much
Great video lecture. I got a little lost towards the end when multiplying voltage and current. I think that is because I need more background on positive and negative power and circuit analysis. I think that your courses would help me with understanding electrical engineering. With your online courses, is it possible to get help if you don't understand a hard concept? Do you have courses in electronics that would cover topics such as op-amps and circuit design? Some of my goals are to understand IQ modulation and demodulation, power flow in the grid where you have more than one generator, how one grid can sell and buy electrical power from another grid, and how to determine power flow with solar panels connected to the utility where you might need to find how much power is power is being delivered by the utility vs how much power is supplied by the solar panels with their inverters. How would a wattmeter be able to determine power flow in case the solar panels were supplying power to the utility or if the utility is supplying power to the customer. Thank you very much.
Yes I cover power conventions and all of the core topics in circuits but some of the things you are interested are really applications that I don’t cover.
Power isn't a concept measured with RMS in circuits, so "determine RMS power" probably isn't what you meant. You determine the RMS voltage, and the RMS current, but when you multiply the two together, you don't call it "RMS power". You call it power. Technically, it is average power over the course of one cycle. The average power would be the RMS voltage * RMS current, when the voltage and current are both in-phase with each other, which is the amplitudes, each divided by sqrt(2), and then multiplied with each other. In our case, this would be Pavg = 500 Watts. If you really did want to find RMS power, you would multiply the v and i waveforms, and get P=1000*sin^2 (314*t). Then convert the equation from sin^2 into regular sine, through the trig identity sin^2(x) = (1 - cos(2*x)/2). This would be P=500 - 500*cos(628*t). To determine the RMS value of a sine or cosine wave with amplitude A and offset D, you use RMS = sqrt(D^2 + A^2/2). For us, D = 500, and A = 500, which would mean the RMS power is 354 Watts.
Ecellent!! Very good job. In a PURELY RESISTIVE circuit, how would I determine when the power is, say, 60%, 70% & 80% of the full power? If necessary, I could provide an email address for the response.
You can assign whatever sign convention you want, but yes, if you assign power as positive when delivered to the load, then "negative power" would mean power supplied by the load and delivered to the source. When that exists in reality, you really have two sources. An application of this, is a battery energy storage system (BESS), that can be charged by the utility power, and can deliver power to your loads as well. One reason you might want such a system, is if you have a time-of-use billing rate with the utility, which is common for large industrial applications. Perhaps it is cheapest to buy energy at nighttime, and most expensive to buy energy in the afternoon. With a grid-tied battery system, you can charge at night when energy is cheaper, and discharge to support your load when energy is the most expensive in the afternoon.
Can someone point me to where he explains why cosine, rather than sine, is used in the instantaneous power equation? All he says here is that cosine is always used in electrical engineering. But the sine more intuitively represents amplitude, IMO. Apparently I've missed something important to the discussion.
In the steady state case you can put the t = 0 point anywhere on the sine wave. Putting point t = 0 at the peaking of the sinewave, i.e. expressing the input voltage as a cosine function, somewhat simplifies the maths. It also sidesteps the ambiguity whether to include the imaginary number j with the sine term to correct the maths.
So, this V and I with angle thetha I cannot be derive by mathematics and it is only to make the I to be maximum when t=0, am I right ? Or there is a way to prove it in mathematical way? Someone please tell me :
Hello Mathtutordvd, I am taking a AC power class right now. I really want to purchase the full volume but i already looked up on the site everywhere and i can't find this AC power series at all. Please help.
Hi I appreciate your enthusiasm for the new course but it isn't available for purchase. A new lesson from this series will come out every other day. So, the next lesson will be tomorrow, and so on. You can visit mathtutordvd.com and become a member and view these lessons as they come out. When they are all released then the entire course will be available for purchase but that won't be until Nov 2. Thanks!
I fucking hate this subject. Why are there so many definitions? Average power, instantaneous, reactive, real, complex.... And why are there a hundred forms of the same equations ffs? And in the exam they don't give us a formula sheet, we're supposed to memorize the hundred equations and their hundred different forms.
Because when voltage and current are both sine-waves, then there are a lot of characteristics. What's the average voltage? What the peak voltage? At what time do we have what voltage? What's the phase-shift between current and voltage? All of those things have an impact on power, the way the resistances add etc. If you had to memorize all of those equations, then yes it would be a big deal, but once you understand the subject you really don't have to memorize every equation anymore, since you should be able to derive them from a relatively small number of equations. If you can't do that then you didn't understand the subject anyway.
There are so many definitions and equations, because voltage and current are not necessarily synchronized waveforms that follow each other linearly, like they do with simple resistive loads. The definitions and equations are to help you keep track of phase differences and the implications of voltage and current not being in phase with each other. Components like inductors and capacitors cause this phase shift, and this phase shift means that current and voltage don't simply multiply to get power.
Please take this as a compliment...I seriously think DISNEY should give you your own STEM show. The explanations and drawings in your videos are so informative and logical you can inspire many young people. Thanks for your passion to educate!
OMY LORD!! If you are like me and just coming to this page to look for help in electrical theory for testing for a job...Listen to me this man is a freaking GENIUS!! I just went and looked at his video playlist..WOWIE!!! I am about to take the technical college entrance exam too... Boy am I glad that I found you because that exam has TRIGonometry and I am really going to need these videos!! I have been to a lot of really tutors on you tube but dude you truly are a GENIUS...Like how do jam all of this into your brain?? It is TRULY AMAZING!!! YOU ARE TRULY AMAZING!!!
Sir, you are the best I have ever known. You have taught me a lot of information even though I am a student in ASU so ,you deserve a great thank 😊 👏 🎉
Wow!! I just found this channel while I was looking for some detailed explanation of AC properties.
You have put out A MOUNTAIN of lessons, and everything I've seen is paced really well for a beginner. It's easy to do small skips when you're covering something I know.
People like you make TH-cam SO valuable. Thank you for producing all of this amazing content
Thank you so much!
AC/DC power and the the topics that you are lecturing, your have given me inspiration, already a few short videos from you have been great. I'm going to watch all of your lectures and I am confident you'll be key to getting me to where I want to get to
I like the way you explain things with emphasis, you're the best I have ever seen sir, thank you for doing what you do best
sir thankuu so much...i'm a physics student from india and and having a test tomorrow :( i didn't know i would find so helpful videos like this one on youtube ,,,,,,,,,,,,,,,,,thankuuh so much i understood so much and now i think i could do better in test....thankuuh so much
Good luck in your studies!
Get our Free App and View all Lessons!
www.MathTutorApp.com
thank you....big help tommorow will be my midterm in circuits....from philippines...
Sir thanks for your kindness like your way of teaching you are excellent
I am a student department of EEE from Bangladesh.Your lecture really good.
vai apni kon verct te??
Rajshahi University,,,,,Aponi kon versity
Such an amazing concept and way of your teaching sir. You will always be remebered
Incredible lecture
you are the best ever. thanks very much for the video
u made theory so clear... i really don't understand what the books are illustrating...
you just got a new subscriber .thank you for such a helpful video
Awesome !I love the pace you are moving.🤗
You, sir, are VERY helpful and thorough!
Video is good and please make a video of definition of magnetic flux , electromotive Force,star Delta, electrostatic and please guide about kva and kw
Very well said. Sir thank you for sharing your knowledge to us. Godbless and stay safe.
Has anyone here realised this dude used to work for NASA?!
WTF. Buying all the dvds
Now I understand why he referenced a spaceship's vibration somewhere else.
I like your video it's helpful can I get more of your videos
Great video lecture. I got a little lost towards the end when multiplying voltage and current. I think that is because I need more background on positive and negative power and circuit analysis. I think that your courses would help me with understanding electrical engineering. With your online courses, is it possible to get help if you don't understand a hard concept? Do you have courses in electronics that would cover topics such as op-amps and circuit design? Some of my goals are to understand IQ modulation and demodulation, power flow in the grid where you have more than one generator, how one grid can sell and buy electrical power from another grid, and how to determine power flow with solar panels connected to the utility where you might need to find how much power is power is being delivered by the utility vs how much power is supplied by the solar panels with their inverters. How would a wattmeter be able to determine power flow in case the solar panels were supplying power to the utility or if the utility is supplying power to the customer. Thank you very much.
Yes I cover power conventions and all of the core topics in circuits but some of the things you are interested are really applications that I don’t cover.
@@MathAndScience I think that the math alone would be a great help. Thanks again.
Çok sağolasın amca çok iyi anlatmışssın.( Thanks for videos big brother, that are too helpful.)
Hello, I appreciate your lectures. Thank you sir
thanks for the theory, the educational system is all about memorizing equations to pass tests
THANK YOU... SIR...!!!
The voltage and current in an AC circuit are given as v = 100 sin (314 t) ; i = 10 sin (314 t). Determine RMS power.
Power isn't a concept measured with RMS in circuits, so "determine RMS power" probably isn't what you meant. You determine the RMS voltage, and the RMS current, but when you multiply the two together, you don't call it "RMS power". You call it power. Technically, it is average power over the course of one cycle.
The average power would be the RMS voltage * RMS current, when the voltage and current are both in-phase with each other, which is the amplitudes, each divided by sqrt(2), and then multiplied with each other. In our case, this would be Pavg = 500 Watts.
If you really did want to find RMS power, you would multiply the v and i waveforms, and get P=1000*sin^2 (314*t). Then convert the equation from sin^2 into regular sine, through the trig identity sin^2(x) = (1 - cos(2*x)/2). This would be P=500 - 500*cos(628*t). To determine the RMS value of a sine or cosine wave with amplitude A and offset D, you use RMS = sqrt(D^2 + A^2/2). For us, D = 500, and A = 500, which would mean the RMS power is 354 Watts.
very big thumb up for the hard work sir u really helped me
Great Video!!!!! Everything is clear now.
I LOVE YOU SO MUCH! YOU ARE SAVING LIVES!
Thank you so much for this. I'm studying for my Board Exam. This helps.
Awesome sir
why is the voltage always expressed in terms of a cosine? Why can't it also be expressed in terms of a sine?
Thanks so much!
Thanks so much it indeed helpful weell explain
Thank you sir.
thank you for your hard work.
What's in the box, man???
WHAT'S IN THE BOX?!?!
head of your dead wife!!
am i the only one getting the joke?
@@jacobvandijk6525 seems like you didn't get it in the end (its a refference from the movie seven)
@@polarized6 Never heard of it ;-)
Inductor
Transistor
Resistor
Diodes
Capacitor
Etc
Something wrong I can feel it
😀😀
sir it is very good
good job, helped me going into my lecture!!
So happy you liked it!
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www.MathTutorApp.com
This lecture is amazing. Thanks!!!
The intantaneous power is not time dependent. The proof is given in this video.
Hi I appreciate your lecture, thanks
well explain , thanks
Thank, Great
Brilliance
Sir you the great
Wooow wooow 🔥👏👏 you this is wonderful explanation
This is worst than ending an episode of a series with a cliffhanger... thank you though
Ecellent!! Very good job. In a PURELY RESISTIVE circuit, how would I determine when the power is, say, 60%, 70% & 80% of the full power? If necessary, I could provide an email address for the response.
Negative power is power supplied by the LOAD to the Source isn't it ?
You can assign whatever sign convention you want, but yes, if you assign power as positive when delivered to the load, then "negative power" would mean power supplied by the load and delivered to the source. When that exists in reality, you really have two sources.
An application of this, is a battery energy storage system (BESS), that can be charged by the utility power, and can deliver power to your loads as well. One reason you might want such a system, is if you have a time-of-use billing rate with the utility, which is common for large industrial applications. Perhaps it is cheapest to buy energy at nighttime, and most expensive to buy energy in the afternoon. With a grid-tied battery system, you can charge at night when energy is cheaper, and discharge to support your load when energy is the most expensive in the afternoon.
what causes electric motor to trip on instantaneous current
thank you
Nice
AWESOME!
What about if, WE can see it on real board circuits, and a tester in action, and the camera more time on the circuits
Can someone point me to where he explains why cosine, rather than sine, is used in the instantaneous power equation? All he says here is that cosine is always used in electrical engineering. But the sine more intuitively represents amplitude, IMO. Apparently I've missed something important to the discussion.
Ah, ha! He talks about this exact situation at the start of the next video! th-cam.com/video/8zMiIHVMfaw/w-d-xo.html
In the steady state case you can put the t = 0 point anywhere on the sine wave. Putting point t = 0 at the peaking of the sinewave, i.e. expressing the input voltage as a cosine function, somewhat simplifies the maths. It also sidesteps the ambiguity whether to include the imaginary number j with the sine term to correct the maths.
So, this V and I with angle thetha I cannot be derive by mathematics and it is only to make the I to be maximum when t=0, am I right ? Or there is a way to prove it in mathematical way? Someone please tell me :
man that groundwork was covereddddd
why i dont get a teacher like that
Isn't theta v - theta i equal to the angle of impedance?
if AC electric power is a ramp function of time then what is the magnitude of power in given time T???is it RMS or average value???
Hello Mathtutordvd, I am taking a AC power class right now. I really want to purchase the full volume but i already looked up on the site everywhere and i can't find this AC power series at all. Please help.
Hi I appreciate your enthusiasm for the new course but it isn't available for purchase. A new lesson from this series will come out every other day. So, the next lesson will be tomorrow, and so on. You can visit mathtutordvd.com and become a member and view these lessons as they come out. When they are all released then the entire course will be available for purchase but that won't be until Nov 2. Thanks!
I love theory...
thank you so much
Welcome!
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www.MathTutorApp.com
I can not find this course in your website
I wanna buy the full
Hi, here it is! Thank you! www.mathtutordvd.com/products/AC-Circuit-Analysis-Tutor-Vol-3-AC-Real-and-Reactive-Power-Calculations.cfm
I have just downloaded the course
First time I buy something online 😅
Very excited to watch them 😄😄
Thanks a lot for your quick response
"We can't just subtract the phase angle and throw it in the toilet"-- bruhhhh
Can we consider it v to be vmsinwt
in electrical eng we use cosine function instead...but we can use the sine function
Ok sir very noice lectuer
Where have you been all my life?? Hahaha!
"I know all this stuff is elementary." Stop saying that 😂
pirfact explanation
Could you by any chance be christened a point in your life? Cuz ur like jesus.
first
I fucking hate this subject. Why are there so many definitions? Average power, instantaneous, reactive, real, complex.... And why are there a hundred forms of the same equations ffs? And in the exam they don't give us a formula sheet, we're supposed to memorize the hundred equations and their hundred different forms.
Because when voltage and current are both sine-waves, then there are a lot of characteristics. What's the average voltage? What the peak voltage? At what time do we have what voltage? What's the phase-shift between current and voltage? All of those things have an impact on power, the way the resistances add etc.
If you had to memorize all of those equations, then yes it would be a big deal, but once you understand the subject you really don't have to memorize every equation anymore, since you should be able to derive them from a relatively small number of equations. If you can't do that then you didn't understand the subject anyway.
There are so many definitions and equations, because voltage and current are not necessarily synchronized waveforms that follow each other linearly, like they do with simple resistive loads. The definitions and equations are to help you keep track of phase differences and the implications of voltage and current not being in phase with each other. Components like inductors and capacitors cause this phase shift, and this phase shift means that current and voltage don't simply multiply to get power.
offfffff...2min only BLA..BLA