I'm an electrical engineer of 30 years and I'm telling you now I couldn't think of a better source of engineering information than this channel. Its so well put together and explanations are (99.9%) of the time spot on. Paul, I've said it before I wish you were my college lecturer many moons ago! Keep up the good work
QQ: This video stops at the calculation of the leading-factor apparent power that has to be introduced by capacitive loads. How would one go from this stopping point to figuring the amount of capacitance one must introduce into the system in order to introduce the correct amount of power factor correction into the system?
Hello Paul, I spent 8 hours today trying to learn Power Factor from my course notes and text book. Became really highly frustrated because nothing made any sense. Then I watched and studied your videos. I first went through Resistance, Capacitors, Inductors and Induction Motors and then I did your entire Power Factor Video including all calcs. I starting with your videos at 22.00 on Monday night. Its now 03.34 on Tuesday morning and I can now say that I have mastered Power Factor. WITH ALL MY HEART, THANK YOU PAUL. YOU ARE MY SUPER-HERO. Your Videos are super fantastic. Please keep up the Excellent work! Regards, Rajan. South Africa
That was probably the best layperson's explanation of power factor, kvars, etc. Many years ago I was brought in to work on an inductive furnace, used to melt aluminum. The system was driven by a motor-generator. On the control panel was a meter labeled KVARS, part of the scale was in RED. We were getting readings in the red, I didn't understand why. We also had a bank of capacitors that could be switched in and out. I spoke with one of our proffesors and he gave me a very good explanation. What we found is that some of the switch contacts on the capacitor bank were worn out and we were unable to change the PF. The switch said we were adding capacitors but in reality, we were not. Having taking power quality classes since, what has changed in a building is the type of load. Much of it today is from switching power supplies in computer equipment, also many of the motors used in HVAC are soft start and variable frequency. One obvious clue is to feel the temperature of the power panel, as the PF drops, the panel gets warmer, from the losses, and we pay for it. I wish I saw this video 30 years ago, very good. Jim
30 years ago? RUclips started in 2005 and therefore didn't exist in 1991. Neither did the Internet. Well the Internet did exist in 1991 but was only seen in educational environments for a bit before it started taking off significantly in the public space in 1993/1994. In those early days, downloading a video the size seen on RUclips today would have been unfathomable on dialup where it took about 10 minutes to download 1MB.
I used to work in PFC, and this way of explaining the problem, and solutions is first class. It is hard for a non electrical engineer to understand the concept, but most people could get some understanding from this video. Regards.
I WISH I'd have had vids like this back when I was a kid trying to internalize information from various text books on these subjects. MUCH more intuitive than the abstract stuff you get from ink-and-paper. God bless you!!!
Possible correction and suggestion ...at about 2:37 In the True Power formula, I think the label for the first term was intended to be "Apparent Power" (kVA) in yellow or orange, as opposed to "Reactive Power" (kVA) in green. Also in the final Power Factor formula it is hard to tell whether the symbol between the two terms is ÷ or +. I think it is ÷ though / might be clearer.
Gord, good catch. I saw that as well. The last formula, the symbol is a Division Symbol. If you compare it with the Plus Symbol in the formula above, under the radical, there is a clear difference.
Magnificent! I have no background in electrical engineering and I work for an electric vehicle charger company. Stuff like this really helps me look smarter in front of customers and explained way better than I could find anywhere else!
Thank you, I’m trying to learn about power factor, I work in an industrial plant and we deal with it for induction and synchronous motors. This is good information.
The biggest problem with most universities teaching EE is their emphasis. They emphasize too much on doing the complex calculation instead of basic concepts. What are we trying to accomplish with those numeric computations? Why is it so important to calculate the power factor? Yes, we know it is for efficiency but had no idea how to correct the problem or that utility company could charge us more (basic economics). Another big problem - fast pace. We cover so many materials every semester that everything is a rush. We don't get to enjoy and reflect back on what we have learned. Having an EE background actually helps me enjoy these videos, like watching a good movie - no stress at all compared to in an actual class. Made me appreciate all the things I have learned in EE. Got my EE degree in San Diego, California.
This may be the single best electrical engineering video I have ever seen. Such a clear and practical explanation of what is one of the most complex but fundamental concepts in electricity. Love this.
After many decades of doing operations, maintenance and repair in power substations and not " fully " grasping the concept of kva power factor, which was used for transformers, very large transformers, fan plant motors, pump room motors, compressor motors, overhead crane motors etc. I now have a better understanding of power factor and kva rating than I did all those years working with equipment with a kva rating. To be fair, in performing my job a true understanding was not nessecerry as I had no part in the design and specifications of the equipment, that was the engineering department. I just operated, maintained and repaired the equipment. Thanks for a better understanding.
This video cleared my concept of power factor. Before this, I was always confused and ambiguous. Thank you for these elaborative videos and keep it going. This channel is God sent literally
those books (of 1000s of page) made it more difficult for us to understand these concepts. And it took Paul, just an 11 mins to teach us this query. Keep going brother! we need more of you.
👏Really a great video for learners. But I think there is a small correction. At 2:38; in the first equation, it's not Reactive Power❌It is Apparent Power✅ True Power (kW) = Apparent Power (kVA) x Cos θ
This is the best way I've seen power factor and VARs explained. The beer analogy was genius. I tried to explain power factor and VARs to someone and found it difficult to lay out the concept without getting into inductive and capacitive reactance. The beer analogy cuts through all of that into a digestible concept for the average person.
Great videos of yours, I appreciate deeply each one of them. I've found the animations particularly descriptive, much more than all the drawings I could see on student books. I did not go through all the commentaries to check whether someone already commented on the slide with the trigono. A minor mistake :. True Power [kW] = Apparent Power [kVA] x cos(Theta) or True Power [kW] = Reactive Power [kVAr] / tan(Theta) but not True Power [kW] = Reactive Power [kVA] x cos (Theta). I guess you meant : equation 1 squared + equation 2 squared = equation 3 squared, so Eq1 should read : True Power [kW] = Apparent Power [kVA] x cos(Theta). Correct ? Also Power Factor = cos(Theta)=True Power/Apparent Power (the division symbol can be confused with a + sign). This was already mentionned in a previous comment. Hoping it helps.
at 2:35, right bottom section, the formula: True power (KW) = Apparent Power (KVA) x Cosφ，please correct it. All the rest are perfect. I love this channel.
Thank you so much Paul for these amazing explanations! Most text books are super confusing but you've managed to find a way to make these easy to learn!
Koooooool, science is GR8. I don't even know if they teach it anymore. any kind of science the 3 classes of levers, torque /speed, We had a gr8 science teacher, he had an old telephone magneto from the Beverly Hillbillies . hookt it to a lamp. and unscrewed the bulb. magneto was easy to turn quickly. once the bulb was in the circuit, well friend, more torque needed as the current flowin thru lamp, also flowed thru armature in magneto. all those turns of wire made the armature an electro-magnet and its poles were attracted to the field magnets, that is why there was a 'drag' effect cuz work was being done. It shows from the 1st half of the experiment when lamp was not on and if a voltmeter were hookt across the lamp you would have seen the volts the mag was putting out, yet was e.z. to crank. then when lamp was lit, the work it took to lite it. so amps is the electrical equivalent of TORQUE and volts, the electrical equivalent of SPEED. Hope this helps you understand a bit more of science.
animation at 2:30 - as the foam (Q) increases, and the glass remains the same (S), beer (P) should be decreasing. In the triangle it's a little bit messed up, but I got your point.
Just a quick comment on your font. Your division symbols look incredibly like plus signs; in fact until I heard your narration I thought they were addition expressions. Perhaps consider substituting slashes (for space saving) or expressing them as fractions (for clarity).
I am speechless sir, I am an electrician , if it is possible to go back on time I am going to learn electrical engineering from you. Seriously you are out of this world
Hello there! I would like to make a observation. In the university where I'm studying they've told us that power output of an induction motor is mechanical (Pmec=τ*ω=τ*2*pi*n/60 [Watts], right?). So, in order to find the power input of the motor which is electrical (P=3^1/2*Vline*Iline*cosθ), they were giving us the motor's efficiency (η=Pout/Pin=Pmechanical/Pelectrical). For example if we have a motor with Pout=10 kW, efficiency of 0,9 or 90%, Vline=400 V, f=50 Hz and cosθ=0,85 then: η=Pout/Pin=> Pin=Pout/η=10/0,9=> Pin=11,1 kW (active power the motor's coils are consuming).
You had me on the edge of my seat and then then you ended the video! How do you calculate the size capacitor improve the PF? Great videos. Hope you do a video to cover this.
@@jamesharmer9293 The AC-capacitors comes rated in (k)VAr at specific frequencies, so conversion is usually not necessary, but here goes: Farad = 159235 x VAr / (Hz x Volt^2) For mF, divide by 1 000 (10^(-3)) For uF, divide by 1 000 000 (10^(-6))
Thanks so much for these videos. I have zero background in electrical engineering (except GCSE physics in 2002...) but am in a relevant industry now. I'm also awful with maths. I don't need to be the expert at all but I'm working to understand the basics. These videos are so well made, clear, and easy to understand... Thank you again I really appreciate it!
Can't think of such kind of analogy, drinking beer for the past 17yrs and being electrical technician for the same period unable to figure out this analogy of a glass of beer and P. F. you are genius dude
I am convinced that we do NOT need UNIversity We can learn here for free And my UNIversity play YT vids all the time insted of teaching... kind of sad that i gave away so much money and didnt lear a thing And now have to lear for free on YT and with 1 vid lear everything faster and better. Just disapointed... Love you man!
Thank for sharing this video my professor teach same way this beer example but I don’t understand very well, now I can watch several times to understand
Awesome! I’ll be sure to use the beer analogy next time I have to explain PFC to anyone! Bloody brilliant idea especially when at the pub and wanna sound clever! Cheers from Australia mate and keep up the great vids 😊👍🍺
This is how the apprentice should start their work and understanding...... not just bending pipe and yanking rope !!! you guys lay it out so well, one cant help but understand......... only if one wants too !!! Thank you
I'm studying electrical engineering and another good formula to use is Power Capacitor new= true power( tan(Angle current)-tan( angle new)) In this case 50(tan(38.7)-tan(16.3))= 21.5KVAR
Surely you should include motor efficiency into the equation for induction motors. For example a 10kW output motor will consume more than 10kW true power before we consider PF.
Great explanation with good visuals. The only problem I have with it is at 2:25. The movement of the power triangle and the beer animation do not match. The beer animation is wrong. As the reactive power increase, the foam increase (which is good), but as a result the true power represented as the actual beer decreases. The triangle show the true power staying the same and the apparent power increasing. To correct this, as the reactive power increase along with the apparent power in the triangle, the beer animation should show an increase in foam and total glass size. The actual beer should not decrease as the foam increases. Thanks again for the fantastic channel!
this is the best way to explain PF to managers, students, and great refresher material... thanks a lot... next how the power grid is changing with thousands of inverters on line...:) ohoh
I'm an electrical engineer but moved on to become a program manager because of the salary. Watching this video really makes me miss the days I worked on power distribution. 😭 But I don't miss the sexism.
I was just trying to figure out what an acceptable power factor was...... I got a little bit more information. This was a great refresher on some things I forgot.
thank you i really appreciate what u guys are doing for us we the young engineers of today after watching numerous of your videos i now understand what my lecturer means in the class room
Excellent explanation. My questions: 1. how do I know that I need capacitor or indication? 2.will adding synchronous motor on the system will increase the PF? Thanks
1. You can measure PF with special meters, but most often capacitors are needed 2. Synchronous egenerators are used to correct PF, and the amount and type of reactive power depends on the state of excitation
Great video, as always. I'm hoping you'll make one regarding three phase generators and the way they are connected (delta and Y configurations). Cheers!
My electrical professor was old school and he taught us how to calculate power factor without special meters that tell you what it is. Until today I didn't know you could actually measure apparent power lol. Good to know because I forgot all the formulas :)
Sir your are explaining excellent. Your video is very knowledge full ti us..animation is better for understanding any concept. Your video is very helpful to students increase the knowledge. Thank you sir... Keep it up.
I'm very thankful on how well you explain the concept as now even though I'm currently struggling in my circuits course, I'm able to realize and connect different concepts in an ac circuit especially about this power factor. Kudos to you and look forward to watching more of your videos.
I'm about to start my final year project on automatic power factor correction, thinking I might have bitten off more than I can chew lol. Thanks for the upload, gives me a better understanding of the issue at hand.
Your beer level kw changes as pf decreases. Kw the liquid beer would remain constant and you just get more foam kvar so the total volume kva gets larger. You showed the glass volume as constant.
Forever ago I remember watching some garage inventor that got threats from the power company that they would shut off his electricity. Now I understand why they were mad, his "not quite perpetual motion machines" must have had some horrible power factor.
I wish every school could explain as clearly as the video's on this channel they really help me understanding what im learning now. If they would be in dutch i would have dragged the class to this course. One request could you do one on Harmonics? I find it hard to correctly understand this. Or it could be that im not ready for it.
2:37 I think the first line in the equations is supposed to be apparent power kVA rather than reactive power. It might be obvious but it got me confused for a bit.
great videos, picking up lots of useful info, as a former beer drinker I do have to admit that the foam is integral part of the fun, at least where we lived.
Superbly lucid explanation. I don’t think I could have understood the subject but for this video. I thought that voltage multiplied by amperage gave wattage or energy. Thank youuuuu! 👌
In the USA I believe Residential customers only pay for True power. You mentioned in the video that we must all pay for it regardless. This is why commercial billing is different. Meaning if you have a motor connected that has a poor power factor in a residential service. The customer only pays for True Power, and the power company absorbs the cost of the Reactive power.
0:52 thats why beer glasses are "calibrated measuring instruments" in Germany where you have to be able to verify if the beer is properly filled till the top and not just foam, so stone pitchers are forbidden by law as you cannot verify the beer level.
⚠️ *Found this video super useful?* Buy Paul a coffee to say thanks: ☕
PayPal: www.paypal.me/TheEngineerinMindset
Please keep on ...your channel one of best I watch on RUclips
Know what Ether is buddy all the best
@@MrAbdalla915 can u suggest any RUclips channel like this one which i can subscribe for Electrical Engineering???
Awesome
I just lost here
I'm an electrical engineer of 30 years and I'm telling you now I couldn't think of a better source of engineering information than this channel. Its so well put together and explanations are (99.9%) of the time spot on. Paul, I've said it before I wish you were my college lecturer many moons ago! Keep up the good work
How can you be an electrical engineer for 30 yrs and not know these fundamental electricity concepts?
@@borysnijinski331 I didn't say I didn't know them
QQ: This video stops at the calculation of the leading-factor apparent power that has to be introduced by capacitive loads. How would one go from this stopping point to figuring the amount of capacitance one must introduce into the system in order to introduce the correct amount of power factor correction into the system?
I don't even bother watching my lectures anymore, i just lookup the topic and find someone that can explain it 50x better!
@@borysnijinski331 😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂
Hello Paul,
I spent 8 hours today trying to learn Power Factor from my course notes and text book. Became really highly frustrated because nothing made any sense.
Then I watched and studied your videos. I first went through Resistance, Capacitors, Inductors and Induction Motors and then I did your entire Power Factor Video including all calcs.
I starting with your videos at 22.00 on Monday night. Its now 03.34 on Tuesday morning and I can now say that I have mastered Power Factor.
WITH ALL MY HEART, THANK YOU PAUL. YOU ARE MY SUPER-HERO.
Your Videos are super fantastic. Please keep up the Excellent work!
Regards,
Rajan.
South Africa
buy him a coffee some day ! Cheers !
That was probably the best layperson's explanation of power factor, kvars, etc. Many years ago I was brought in to work on an inductive furnace, used to melt aluminum. The system was driven by a motor-generator. On the control panel was a meter labeled KVARS, part of the scale was in RED. We were getting readings in the red, I didn't understand why. We also had a bank of capacitors that could be switched in and out. I spoke with one of our proffesors and he gave me a very good explanation. What we found is that some of the switch contacts on the capacitor bank were worn out and we were unable to change the PF. The switch said we were adding capacitors but in reality, we were not.
Having taking power quality classes since, what has changed in a building is the type of load. Much of it today is from switching power supplies in computer equipment, also many of the motors used in HVAC are soft start and variable frequency. One obvious clue is to feel the temperature of the power panel, as the PF drops, the panel gets warmer, from the losses, and we pay for it.
I wish I saw this video 30 years ago, very good. Jim
30 years ago? RUclips started in 2005 and therefore didn't exist in 1991. Neither did the Internet. Well the Internet did exist in 1991 but was only seen in educational environments for a bit before it started taking off significantly in the public space in 1993/1994. In those early days, downloading a video the size seen on RUclips today would have been unfathomable on dialup where it took about 10 minutes to download 1MB.
@@privacyvalued4134I think you may have misread his comment. He wrote “I WISH I saw this video 30 years ago…”
I'm an Electrical Engineer, and I explained this concept many times. I find this is one of the best descriptions.
I used to work in PFC, and this way of explaining the problem, and solutions is first class. It is hard for a non electrical engineer to understand the concept, but most people could get some understanding from this video. Regards.
Ok, so after reading dozens of text books I've come to the conclusion this is the best channel for me to watch and actually understand concepts.
I am a newly graduated Electrical Engineer and this videos are amazing, simple yet very pertinent information and explanations, keep up the good work!
I WISH I'd have had vids like this back when I was a kid trying to internalize information from various text books on these subjects. MUCH more intuitive than the abstract stuff you get from ink-and-paper. God bless you!!!
Possible correction and suggestion ...at about 2:37
In the True Power formula, I think the label for the first term was intended to be "Apparent Power" (kVA) in yellow or orange, as opposed to "Reactive Power" (kVA) in green.
Also in the final Power Factor formula it is hard to tell whether the symbol between the two terms is ÷ or +. I think it is ÷ though / might be clearer.
Yup. That's correct.
Gord, good catch. I saw that as well.
The last formula, the symbol is a Division Symbol. If you compare it with the Plus Symbol in the formula above, under the radical, there is a clear difference.
glad i read your comment, i wrote a plus when copying the formula. thanks
So does the reactive power go back into the grid? Or is it completely wasted?
or cot instead of cos
Mate such a legend. Your lessons are amazing. Such a good teacher as well. Keep them videos coming please.
It is the first time someone makes electricity easy to understand for me. Thank you!
I found RUclips channels better than my Electrical teachers
Thank you for the good explanation
Magnificent! I have no background in electrical engineering and I work for an electric vehicle charger company. Stuff like this really helps me look smarter in front of customers and explained way better than I could find anywhere else!
This 10 minute video, explained it better than my 2 hour lecture did.
Thank you, I’m trying to learn about power factor, I work in an industrial plant and we deal with it for induction and synchronous motors. This is good information.
Buy an UGLYS book it has all this in it!!!and the code.
I spent almost half a day to find the exact video that i wanted. Awesome ! Hats off to your work !
I got my EE degree 7 years ago and it wasn't until this video that I actually understood this concept.
The biggest problem with most universities teaching EE is their emphasis. They emphasize too much on doing the complex calculation instead of basic concepts. What are we trying to accomplish with those numeric computations? Why is it so important to calculate the power factor? Yes, we know it is for efficiency but had no idea how to correct the problem or that utility company could charge us more (basic economics). Another big problem - fast pace. We cover so many materials every semester that everything is a rush. We don't get to enjoy and reflect back on what we have learned. Having an EE background actually helps me enjoy these videos, like watching a good movie - no stress at all compared to in an actual class. Made me appreciate all the things I have learned in EE. Got my EE degree in San Diego, California.
This may be the single best electrical engineering video I have ever seen. Such a clear and practical explanation of what is one of the most complex but fundamental concepts in electricity. Love this.
After many decades of doing operations, maintenance and repair in power substations and not " fully " grasping the concept of kva power factor, which was used for transformers, very large transformers, fan plant motors, pump room motors, compressor motors, overhead crane motors etc. I now have a better understanding of power factor and kva rating than I did all those years working with equipment with a kva rating. To be fair, in performing my job a true understanding was not nessecerry as I had no part in the design and specifications of the equipment, that was the engineering department. I just operated, maintained and repaired the equipment. Thanks for a better understanding.
This video cleared my concept of power factor. Before this, I was always confused and ambiguous. Thank you for these elaborative videos and keep it going. This channel is God sent literally
those books (of 1000s of page) made it more difficult for us to understand these concepts.
And it took Paul, just an 11 mins to teach us this query. Keep going brother! we need more of you.
👏Really a great video for learners.
But I think there is a small correction. At 2:38; in the first equation, it's not Reactive Power❌It is Apparent Power✅
True Power (kW) = Apparent Power (kVA) x Cos θ
This is the best way I've seen power factor and VARs explained. The beer analogy was genius. I tried to explain power factor and VARs to someone and found it difficult to lay out the concept without getting into inductive and capacitive reactance. The beer analogy cuts through all of that into a digestible concept for the average person.
I hope there’s video like this during my college years. Studied about lead lag but don’t have an idea what it’s for.
Great videos of yours, I appreciate deeply each one of them. I've found the animations particularly descriptive, much more than all the drawings I could see on student books.
I did not go through all the commentaries to check whether someone already commented on the slide with the trigono.
A minor mistake :.
True Power [kW] = Apparent Power [kVA] x cos(Theta) or
True Power [kW] = Reactive Power [kVAr] / tan(Theta) but not
True Power [kW] = Reactive Power [kVA] x cos (Theta).
I guess you meant : equation 1 squared + equation 2 squared = equation 3 squared, so Eq1 should read : True Power [kW] = Apparent Power [kVA] x cos(Theta).
Correct ?
Also
Power Factor = cos(Theta)=True Power/Apparent Power (the division symbol can be confused with a + sign). This was already mentionned in a previous comment.
Hoping it helps.
I'm a simple man...I see a glass of beer in the thumbnail and I click it.
WOW WHAT A TRUTH TELLER ......SO YOU MAY DOUBLE CLICK IN CASE OF BLUE LABEL WHISKY
Same
Same
Simply good power factor 🍺 beer..
Indeed sir, indeed.
at 2:35, right bottom section, the formula: True power (KW) = Apparent Power (KVA) x Cosφ，please correct it.
All the rest are perfect. I love this channel.
honestly, best ever explanation of power factor for me was that example with a beer glass.. so simple, yet so precise... kudos to you!
Your analogies really are helping picture these concepts.
Thanks for the time invested in making these videos !
Thank you so much Paul for these amazing explanations! Most text books are super confusing but you've managed to find a way to make these easy to learn!
I really appreciate that you also talk about the industrial/commercial concerns.
There's a mistake sir check 2:41
True power = apparent power kva X cos théta . 😇
i noticed that too because cos angle should be VAr/SVA from the power triangle
correction, should be KW/VA
yup.. it was repeatition of first formula.. just play around with that.
I recently had a talk about this with my colleague. This is a really great video. 👍
Wow you sparked my interest in science.
Koooooool, science is GR8. I don't even know if they teach it anymore. any kind of
science the 3 classes of levers, torque /speed, We had a gr8 science teacher, he
had an old telephone magneto from the Beverly Hillbillies . hookt it to a lamp.
and unscrewed the bulb. magneto was easy to turn quickly. once the bulb was in
the circuit, well friend, more torque needed as the current flowin thru lamp, also
flowed thru armature in magneto. all those turns of wire made the armature an
electro-magnet and its poles were attracted to the field magnets, that is why there
was a 'drag' effect cuz work was being done. It shows from the 1st half of the experiment when lamp was not on and if a voltmeter were hookt across the lamp
you would have seen the volts the mag was putting out, yet was e.z. to crank.
then when lamp was lit, the work it took to lite it. so amps is the electrical
equivalent of TORQUE and volts, the electrical equivalent of SPEED. Hope this helps
you understand a bit more of science.
Learn how *THREE PHASE ELECTRICITY* works here ➡️ ruclips.net/video/qthuFLNSrlg/видео.html
animation at 2:30 - as the foam (Q) increases, and the glass remains the same (S), beer (P) should be decreasing. In the triangle it's a little bit messed up, but I got your point.
Your observation is correct. And I will add that the right unit for reactive power is var not VAr.
Yeah, I was looking for this comment, I noticed the same :)
Just a quick comment on your font. Your division symbols look incredibly like plus signs; in fact until I heard your narration I thought they were addition expressions. Perhaps consider substituting slashes (for space saving) or expressing them as fractions (for clarity).
Hey man, that's what 4K was invented for
On the calculations at the end, I thought the 0.96 was a 0% until the audio told me what it was supposed to be lol
This video should be taught on all electricity engineers if they truly want to understand what power factor is. You are fantastic!!
Hi. I really enjoy watching your videos just a minor issue at 02:40 True Power (KW) = Apparent power (kVA( x cos Ɵ
Yea, im agree! here is little mistake
yes really ... how could he come up with : cos (Ɵ) = true power + apparent power
@@mohammadibrahim6253 I think that's supposed to be a division symbol (÷)
I am speechless sir, I am an electrician , if it is possible to go back on time I am going to learn electrical engineering from you. Seriously you are out of this world
One of the best explanations I have seen yet, well done!
Hello there! I would like to make a observation. In the university where I'm studying they've told us that power output of an induction motor is mechanical (Pmec=τ*ω=τ*2*pi*n/60 [Watts], right?). So, in order to find the power input of the motor which is electrical (P=3^1/2*Vline*Iline*cosθ), they were giving us the motor's efficiency (η=Pout/Pin=Pmechanical/Pelectrical). For example if we have a motor with Pout=10 kW, efficiency of 0,9 or 90%, Vline=400 V, f=50 Hz and cosθ=0,85 then: η=Pout/Pin=> Pin=Pout/η=10/0,9=> Pin=11,1 kW (active power the motor's coils are consuming).
Best electrical ed channel out there.
Very simple to understand and to the point. Good Job.
You had me on the edge of my seat and then then you ended the video! How do you calculate the size capacitor improve the PF? Great videos. Hope you do a video to cover this.
I agree! What's the value of the capacitor in micro farads ? And how do you work that out ?
@@jamesharmer9293 The AC-capacitors comes rated in (k)VAr at specific frequencies, so conversion is usually not necessary, but here goes:
Farad = 159235 x VAr / (Hz x Volt^2)
For mF, divide by 1 000 (10^(-3))
For uF, divide by 1 000 000 (10^(-6))
From 1 query, you have me hooked. Seriously.
Thanks so much for these videos. I have zero background in electrical engineering (except GCSE physics in 2002...) but am in a relevant industry now. I'm also awful with maths.
I don't need to be the expert at all but I'm working to understand the basics. These videos are so well made, clear, and easy to understand... Thank you again I really appreciate it!
The concept of the Power Factor has been very well explained. I hope that electronics engineers from our school find this channel. :)
I am an electrical practioners here in the phillipines.. Im so very thankful for studying like this. keep up the goodwork. 😉
it's nice to hear dimensions covering an idea like power.. more dimensions = more understanding,.. thank you
The best explanation that I have ever seen!!! 1000 BRAVO
I m electronics and communication engineer but I got fundamentally clear after watching this videos....thanks for making easy..
Can't think of such kind of analogy, drinking beer for the past 17yrs and being electrical technician for the same period unable to figure out this analogy of a glass of beer and P. F. you are genius dude
Was about to rant about the KVAR being "useless" but I saw the explanation later. Well done.
I am convinced that we do NOT need UNIversity
We can learn here for free
And my UNIversity play YT vids all the time insted of teaching...
kind of sad that i gave away so much money and didnt lear a thing
And now have to lear for free on YT and with 1 vid lear everything faster and better.
Just disapointed...
Love you man!
Thank for sharing this video my professor teach same way this beer example but I don’t understand very well, now I can watch several times to understand
Thanks for explaining power factor in so easy way... lots of respect from India
Thank you, do you know we also have a Hindi channel? ruclips.net/channel/UCg4k338hz9U8jnD5SXPO5jQ
Awesome! I’ll be sure to use the beer analogy next time I have to explain PFC to anyone! Bloody brilliant idea especially when at the pub and wanna sound clever! Cheers from Australia mate and keep up the great vids 😊👍🍺
beer analogy was the best!!! thank you!
This is how the apprentice should start their work and understanding...... not just bending pipe and yanking rope !!! you guys lay it out so well, one cant help but understand......... only if one wants too !!! Thank you
Great stuff! Much better than all these low grade tech "learning" videos on RUclips, most of which come out of India.
I'm studying electrical engineering and another good formula to use is
Power Capacitor new= true power( tan(Angle current)-tan( angle new))
In this case
50(tan(38.7)-tan(16.3))= 21.5KVAR
Man! You have cleared my vision.no one here to explain like this.upload more and more video .you have great knowledge with ease of teaching.
Surely you should include motor efficiency into the equation for induction motors. For example a 10kW output motor will consume more than 10kW true power before we consider PF.
after watching 18 videos, my first comment : THANK YOU
Studying level 3 of electrical engineering, this channel is very helpful. Thanks bro.
Great explanation with good visuals. The only problem I have with it is at 2:25. The movement of the power triangle and the beer animation do not match. The beer animation is wrong. As the reactive power increase, the foam increase (which is good), but as a result the true power represented as the actual beer decreases. The triangle show the true power staying the same and the apparent power increasing. To correct this, as the reactive power increase along with the apparent power in the triangle, the beer animation should show an increase in foam and total glass size. The actual beer should not decrease as the foam increases.
Thanks again for the fantastic channel!
this is the best way to explain PF to managers, students, and great refresher material... thanks a lot... next how the power grid is changing with thousands of inverters on line...:) ohoh
I'm an electrical engineer but moved on to become a program manager because of the salary. Watching this video really makes me miss the days I worked on power distribution. 😭 But I don't miss the sexism.
I'll use the beer analogy on my certification extension exam.
I was just trying to figure out what an acceptable power factor was...... I got a little bit more information. This was a great refresher on some things I forgot.
thank you i really appreciate what u guys are doing for us we the young engineers of today after watching numerous of your videos i now understand what my lecturer means in the class room
Correction at 2:35. The first equation should be True Power = Apparent Power x Cos (Theta)..Thanks for yet another great video!
Excellent explanation. My questions: 1. how do I know that I need capacitor or indication?
2.will adding synchronous motor on the system will increase the PF?
Thanks
1. You can measure PF with special meters, but most often capacitors are needed
2. Synchronous egenerators are used to correct PF, and the amount and type of reactive power depends on the state of excitation
As simple as this , most of our LV networks are inductive
Great video, as always. I'm hoping you'll make one regarding three phase generators and the way they are connected (delta and Y configurations). Cheers!
My electrical professor was old school and he taught us how to calculate power factor without special meters that tell you what it is. Until today I didn't know you could actually measure apparent power lol. Good to know because I forgot all the formulas :)
Sir your are explaining excellent. Your video is very knowledge full ti us..animation is better for understanding any concept. Your video is very helpful to students increase the knowledge. Thank you sir... Keep it up.
you are a live saver, i didnt comprehend alot of the basics before seeing your animations...
Very nicely explained. What is the best location/ position of capacitor bank .Thanks
I'm very thankful on how well you explain the concept as now even though I'm currently struggling in my circuits course, I'm able to realize and connect different concepts in an ac circuit especially about this power factor. Kudos to you and look forward to watching more of your videos.
A great video and analogy to how power factors affect current supply 👏
I'm about to start my final year project on automatic power factor correction, thinking I might have bitten off more than I can chew lol. Thanks for the upload, gives me a better understanding of the issue at hand.
Great illustrations! Love the beer analogy! ❤😊
To keep the trig. brief and introduce a new simply analogy. Have you heard of the Horse and Rail analogy for the power triangle?
This is practical like explaination for engr studs.
Nice,thumbs up for this, thx Mr.Paul.
It's best effort for human living
Thanks from nimesh ahmedabad india
Sorry if you feeling poor english
Thank you, did you check out our new Hindi channel? ruclips.net/channel/UCg4k338hz9U8jnD5SXPO5jQ
Your beer level kw changes as pf decreases. Kw the liquid beer would remain constant and you just get more foam kvar so the total volume kva gets larger. You showed the glass volume as constant.
Forever ago I remember watching some garage inventor that got threats from the power company that they would shut off his electricity. Now I understand why they were mad, his "not quite perpetual motion machines" must have had some horrible power factor.
yeah, can't imagine the out of phase feedback and pull that it made
I wish every school could explain as clearly as the video's on this channel they really help me understanding what im learning now. If they would be in dutch i would have dragged the class to this course.
One request could you do one on Harmonics? I find it hard to correctly understand this. Or it could be that im not ready for it.
2:37 I think the first line in the equations is supposed to be apparent power kVA rather than reactive power. It might be obvious but it got me confused for a bit.
great videos, picking up lots of useful info, as a former beer drinker I do have to admit that the foam is integral part of the fun, at least where we lived.
Very nice explaination
Another outstanding video so well explained, thank you very much
Superbly lucid explanation. I don’t think I could have understood the subject but for this video. I thought that voltage multiplied by amperage gave wattage or energy. Thank youuuuu! 👌
In the USA I believe Residential customers only pay for True power. You mentioned in the video that we must all pay for it regardless. This is why commercial billing is different. Meaning if you have a motor connected that has a poor power factor in a residential service. The customer only pays for True Power, and the power company absorbs the cost of the Reactive power.
Very comprehensive video. Thank you
Love the analogy, it's Accurate too.
0:52 thats why beer glasses are "calibrated measuring instruments" in Germany where you have to be able to verify if the beer is properly filled till the top and not just foam, so stone pitchers are forbidden by law as you cannot verify the beer level.
Excellent explained ,thank you so much