AC Theory: How to Calculate Power Factor in an AC Circuit: What is Power Factor?

[@Lichfeldian--Suttonian]

FINALLY, a video that explains it all using ONE right-angled triangle, that in fact, each in the three is (effectively) the same animal. cos θ (or ϕ for phase angle), ° = Adjacent/Hypotenuse = VR/VT = R/Z = W/VA = Power Factor. Where θ (or ϕ for phase angle) = 0°, VL = 0, X = 0, VAr = 0. This is a DC (direct current) circuit. Thank you for the best clarity that I have seen to date!

[@triplerjm2353]

I would like to thank you Joe for all your series of video uploaded and I spent my last 10 days going through them in order to be ready for my Adv Sc Princ L3 at Optima London Training Centre , I have smashed it. Thank you Thank you Joe. you don't know how many of out there who are taking advantage of your video. May God continue to give the courage, and enough energy upon years coming Joe.

[@JoeRobinsonTraining]

Wow, what an incredible comment. So glad the videos have been helpful to you, it's hard work but it's great to know that people are benefitting from them. 😊

[@ericweenink7578]

Your videos are very much appreciated. I’ve been struggling with A/C theory in my power engineering for weeks. Trying to wrap my head around everything. Your videos laid it out perfectly and it makes perfect sense. Thanks man, this will go a long way in helping me pass my test next week.

[@JoeRobinsonTraining]

I'm just really glad they've helped Eric, it makes it all worthwhile, thank you so much for chipping in financially, it's very much appreciated. Let me know how you get on with your test yeah? 💪

[@gav2487]

Finally a video that deals with this topic in a simple but complete and in-depth way! Thanks for all your phenomenal videos that deserve a thumbs up.

[@JoeRobinsonTraining]

My pleasure Gav!

[@pault4793]

considering i ve been a spark for 30 years, still a good sunday morning watch, never stop learning . good video

[@JoeRobinsonTraining]

Good to know, glad you enjoyed it! Stay tuned for more.

[@mahmoudalphysics7494]

I am so sorry that I don't know such a proper way to thank you for your impressive work, please keep going

[@zacharybob4336]

Sure appreciate your efforts in these videos Joe, makes a world of difference to supplement my Electrician apprenticeship coursework with your teachings.

[@Antiquity_Zine]

Very informative. I’ve learned more from this short video than the past few weeks from my instructor. Crunching numbers doesn’t always add up.

[@lexluther971]

Hey wonderful joe I wz really fearing this subject I wz hoplessly thinking I wz gonna get lost but listening to you giving me a great hope .Im a 68 yr old trying to get my head around this for my Electrical theory level 3 nite class.Thank you so much I can do this now wth comparative ease yahooee

[@JoeRobinsonTraining]

Ah brilliant, there's loads more on there about AC Theory to help deepen your understanding, hope it helps and keep us posted on your progress!

[@sooslikas]

this video is the holly grail of your ac theory thalmud bro! I feel enlightened and calm like a bhuudahh before my exam! Feelin' like ZEUS allready! ( he was the first sparky ever , innit)

[@JoeRobinsonTraining]

Wow, this is quite the mixed metaphor! 😂

[@ranjan1436]

Awesome, you make things so simple. Looking forward to your next video on the sizing of the Capacitor needed to improve from low Pf also the required KVAR.

[@JoeRobinsonTraining]

Thanks for the feedback, the next three Sunday videos will build up to that.

[@PaulR387]

Excellent, I finally managed to understand all of this, thank you Joe

[@mitchellshallcross1369]

Great timing, currently going over this at college. Great video for continuing my development. Thanks Wanting top mark in the end of yer exam ha

[@JoeRobinsonTraining]

Good lad, if you want anything going over feel free to make a suggestion. Hope you get the top marks bud, let me know!

[@GSHElectrical]

Fantastic as always Joe 👍

[@JoeRobinsonTraining]

Cheers Gaz.

[@munafmufc01]

Joe...you should be given a knighthood for all your helpful videos. They are very clear and concise. So helpful for apprentice and students like me. Thank you.

[@edsherwood2173]

I’m going through AC theory now and man I wish I had you as a teacher. Thanks for the videos you got a new subscriber, keep them coming

[@sahilyo4]

this video made things so easy for me. really simple

[@ianclark8194]

Fantastic video as always Joe. It's great to see new ways of delivering a sometimes difficult and confusing subject to present. I find myself talking back to you which the wife finds quite amusing. Keep up the good work

[@JoeRobinsonTraining]

Thanks Ian, it's the result of wrestling with the subject myself for about 11 years. Keep chatting back on screen and feeding back in person!

[@thedavesofourlives1]

better than sports

[@eddieking7736]

Clear explanation, your videos are top notch, thank you.

[@JoeRobinsonTraining]

My pleasure, glad they make sense, always a bit tricky to know when you're talking to a camera on your own!

[@Javier-u8p]

Sir, thank you for this lesson. It's helped me a lot.

[@jadenjosea7261]

thank you for all these videos, you explain them so well and make it easy for us.Thanks alot keep on giving these lessons

[@djchameera]

love these vids helps a lot to learn as a apprentice

[@kilyobasbinga7552]

By the way, I really appreciate your excellent video presentation

[@jakedavey5211]

this was incredibly helpful

[@kabandajamilu9036]

So nice and educative sir keep it up 100%nice

[@abumusa6093]

Your videos are fantastic and super helpful! Thank you so much Joe.

[@kilyobasbinga7552]

In power factor correction, are we correcting the phase difference between the current and voltage of the public power supply company or is it correction of the inductive loads which could be water pump or any other kind of load. Secondly, do resistive loads have phase difference? Does it mean when the loads are purely resistive the power factor is at its maximum theoretical value of 1?

[@YangobingYana-d6r]

Simple and very conceptual❤

[@claudiod.7385]

Simple, complete and therefore very good explanation. Only one question: Where do I find the power factor information on a, let say, laptop external or internal transformer or any other transformer and how do I in practice verify/measure it ? Keep in mind that sometime the transformer's power is not specified, typically on laptop's ones. Thank you.

[@stephenboden3558]

Hi Joe. Thank you for taking the time to produce great and explanative videos. I'm about to start Level 3 at college, although it may be at home at some point. Is it possible for you to cover Kirchoff's Law? Both Current and Voltage...TIA

[@JoeRobinsonTraining]

You are more than welcome. I'll add Kirchoff's Law to my to do list.

[@kevbudgie1]

Hi Joe, would you be able to help with a pf question and the formula? In a circuit with a 4ohm resistor and a 10mH inductor what is the power factor.

[@tedlahm5740]

Three different formulas for power factor. thank you.

[@TheSpuggiehawk]

So, the general case would be that you have an inductive circuit, so the current is lagging the voltage. If a capacitor is used to correct this, does that (for want of a better description) push the current forwards to bring them into phase at 0 degrees offset, or does it push the current back, so it is out of phase by -360 degrees, but lines up nicely :-) ? Either way would work and the cycles would be in sync, but does it matter?

[@casadelrin2966]

yhis is great man. thank you so much. you are a great teacher! Also, electrical engineering can be freakin confusing and overwhelming

[@no_short_circuit]

Thanks Joe. I've followed and understood all these videos. At 11:44 you say "a capacitor generates inductive reactance". In earlier videos you say that a capacitor generates capacitive reactance. I'm confused now.

[@JoeRobinsonTraining]

Sorry! I'm a doofus, should have said capacitive reactance! I've added a note in the description. Thanks.

[@markrowland5393]

Hi Joe. Excellent as always but I also got a bit confused when you said a capacitor generates inductive impedance albeit you did say in the opposite direction.

[@JoeRobinsonTraining]

Sorry, should have said capacitive reactance, thanks for the spot, I've added a note in the description.

[@TIGREinVOLO]

Can you please make a video on generator set power factor? I don't quite get how a genset can have power factor and how can that be corrected, so that I can maximise the usage of the output power. I thought loads have power factor, not sources. Thank you

[@salvatoredibenedetto6742]

thank you joe very helpful

[@CommonInvesting]

brilliant video, im prepping for my level 3 8202 theory now. what if to find out Tp etc, but your only given the angle? how would this work, thanks

[@nicholasmifsud8816]

Hi Joe, first of all I would like to say thanks for your videos I really like your teaching methods. I need some help on AC parallel circuits. Bit I didn't find any video from you. Thank and regards Nicholas.

[@traviswhaling7870]

Joe great video, How do I watch these in series? I generally search the problem I am trying to figure out but then find there is more to it that I should have watched earlier. Is there a way to find the previous videos that would lead up to this?

[@JoeRobinsonTraining]

Hi Travis, thanks for watching and commenting, if you check out my AC Theory playlist below it covers all that I've done on this subject so far. 😊 Check out my other playlists for other electrical topics. 👍 AC Theory: kzbin.info/aero/PL7eNzIRgKe07BOqPH7MrrKy89M3o4wU-2

[@mikatomik5532]

So, question. Why then in the lamp schematic is the correction capacitor on a switch? Is there some disadvantage to having it hardwired in from the factory?

[@JoeRobinsonTraining]

Great question, that switch doesn't exist in fluorescent light fittings normally, it was installed for demonstration purposes to show how connecting and disconnecting the capacitor affects the light fitting and currents etc.

[@mikatomik5532]

Joe Robinson Training Ahhh, of course. I should have known that! I’ve (almost) watched this whole series over the past few days, while I’ve got you here I’d like to say thank you for putting all of this work in to share knowledge with us. It is greatly appreciated as I am an industrial mechanic looking to cross train as a sparky and I believe this will put me well ahead of the curve to be a Michelin certified sparky. I cannot thank you enough.

[@JoeRobinsonTraining]

My absolute pleasure, glad they're helping a bit, feel free to spread the word, seems like a good time to start doing some CPD from home!

[@mikatomik5532]

Joe Robinson Training you got it! Stay safe!

[@isteascope]

Hi Joe. Thanks for your training videos, they are helping me to pass my exams. No, I found this problem, How can I proceed? Let me now any clue... Problem: "A 120 V circuit contain a fluorescent fixture with the two 80 watts lamp, an ampere-metter is connected and indicate a 1.6 amps load. What is the power factor of this circuit ?" Thanks in advance for your help.

[@JoeRobinsonTraining]

Hi Luis, great question, I'll shoot a video, pop it on my channel and give you a shout out if that's OK?

[@isteascope]

@@JoeRobinsonTraining Thanks Joe. That will help me a lot.

[@medo2000200561]

Why overcompensation causes over voltage at the load terminals. I searched for the reason but I did not find the equations that supports this phenomenon. If u can help me please

[@JoeRobinsonTraining]

Good question, maybe the subject of a future video. 👍

[@jamesward9570]

Terrific thanks

[@verminer7]

Can i calculate PF of induction motor?

[@jemir8012]

thanks for this video.

[@mirwais16]

WWhat system voltage do you use?

[@jamesward9570]

Thank joe

[@coatechnics2676]

In what situation do we say the circuit has a poor power doctor ?, is it when electrical bill is to high?

[@faesil2000]

AMAZING VEDIO

[@Shadow_Hawk_Streaming]

my lecturer sent me here after it became apparent our lecturers last year didn't particularly cover.....well, most of the theory tbh, hopefully I'll make head or tail of it eventually.

[@JoeRobinsonTraining]

Check out my playlists to get the info in the correct order Antony, hope it helps! 😊

[@azizbiabani6787]

Sir coupling capacitance?

[@jonny__b]

Great explanation! However I feel like saying "power factor is a bad thing" is slightly misleading in the sense that a higher power factor is actually better than a lower power factor.

[@tammmacdonald7723]

When did the phase angle become referenced as Theta? It was classically identified as Phi.

[@JoeRobinsonTraining]

Oh right I was always taught theta. 🤷‍♂️

[@akau7591]

Wow. love this video

How does the power supply company know what your power factor is to fine you given that they don't, in general, know what equipment you have and how it is used?

[@sadiarehman9175]

Your videos are very informative . But if there is some way you number the Videos from 1, 2, 3, 4 and so on ; it will help a lot to focus in a proper manner .

[@JoeRobinsonTraining]

If you look at my playlist called "AC Theory" they're in order on there.

[@lughtuathade1721]

I still didn't get how did he get that 125V? Can someone enlighten me pls

[@suhailawm]

Tnx alot sir.

[@JoeRobinsonTraining]

No worries. 😊

[@Daz_sz]

Leeegend Thank you

[@kitemanaoru7896]

I love it

[@azizahmedmuhammad4124]

Amazing....

[@shokrollahgholizadehmojaveriam]

Great

[@wallbouncer9655]

👍🕺