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WHAT IS POWER FACTOR OR PF - WHAT DOES kVA MEAN - WHY ARE kW DIFFERENT TO kVA - WITH WORKED EXAMPLES

LEARN ELECTRICS
2023 ж. 15 Қыр.
9 639 Рет қаралды
Жүктеу

In this video from LearnElectrics, we will take a very gentle look at this thing called power factor, and show you how we use Watts and volt-amperes to help us look at how efficient a system is. Starting at a nice easy level, we look at what the different terms mean and how they work together in an electrical installation.
There are always lots of questions about power factor and some of them have included things like …
How can I calculate power factor and Watts?
What is power factor and how does it affect the installation?
And why are VA and Watts different, I always thought that V times A was Watts? And now it isn’t.
But before we start on working out VA and power factor, we will have a look at some basics on the subject of waveforms and resistive and reactive circuits. All good stuff, helpful, interesting, and nice and easy to understand.
This is video number 218 and to view all our videos type in LearnElectrics all one word into the KZhead search bar.
Visit our KZhead channel where we have many more videos on a wide range of electrical topics.

Пікірлер

  • Dave, Thanks again. I’m going to watch this a few times so I totally absorb what’s going on. As a great philosopher once said, “It is not what you know, but what you understand. I want to become an electrician who understands & you make that journey much easier for me.

    @Jim804@Jim8048 ай бұрын

    • Stick with it, learn what you can. You have the right attitude, Dave.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • I Appreciate Learn Electrics again for this easy to comprehend presentation. Great work, thank you.

    @dannysmith2408@dannysmith24088 ай бұрын

    • Great feedback Danny, really appreciated, thank you. Dave.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Always makes more sense the way you do it! Thank you.

    @jackeroojackeroo8169@jackeroojackeroo81694 ай бұрын

    • Glad to help, thank you.

      @learnelectrics4402@learnelectrics44024 ай бұрын

  • The beer analogy, is quite good and a nice explanation.

    @rajanvarghese2352@rajanvarghese23528 ай бұрын

    • Glad you liked it. Thanks for watching. Dave.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Another smashing lesson from professor DAVE as I call him, putting in some more knowledge into our mental toolbox as usual 👌👌👏

    @babangidaciroma4491@babangidaciroma44918 ай бұрын

    • Thanks for the support, really appreciated. Thanks for watching. Dave.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Your a legend thanks Dave

    @munafmufc01@munafmufc015 ай бұрын

    • Happy to help, thanks for watching. Dave.

      @learnelectrics4402@learnelectrics44025 ай бұрын

  • Great video Dave. Hope there will be a follow up video discussing the iron, copper and fixed losses that causes these inefficiencys and the ways on how to improve PF.

    @pietnel6077@pietnel60778 ай бұрын

    • Its planned to do a follow up, yes. Watch this space as they say. thanks for watching. Dave.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • thanks Dave , another clearly presented lesson

    @EdwardBretherton@EdwardBretherton8 ай бұрын

    • Glad you enjoyed it Edward, thanks for the support.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Thanks so much for this, absolute gold!

    @aleko_@aleko_8 ай бұрын

    • Glad you enjoyed it, you're very welcome and thanks for watching.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Excellent Dave👌

    @brianhewitt8618@brianhewitt86188 ай бұрын

    • Thanks Brian.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Another splendid and informative video..👍

    @bonnywail@bonnywail8 ай бұрын

    • Glad you liked it and I appreciate the feedback.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Beer analogy is superb

    @subevo35@subevo357 ай бұрын

    • We all love beer. Thanks for the feedback. Thanks for watching.

      @learnelectrics4402@learnelectrics44027 ай бұрын

  • Thank you Dave

    @mohammadshirifeshki4018@mohammadshirifeshki40188 ай бұрын

    • Thanks for watching, very much appreciated.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Another great video, Thanks again Dave! Have you done anything on wiring PIR and Dusk to Dawn sensors into existing circuits with switches or without etc… ? Another thing would be connections in series and parallel. Your style of programming watching is amazing, thank you again!

    @hussmortada@hussmortada8 ай бұрын

    • Have a look at these two videos this one about two lamps in series kzhead.info/sun/f9adZ86voqWnlWw/bejne.html and this one about series and parallel circuits kzhead.info/sun/h9h6aZh-fHh_hYU/bejne.html

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Love that Beer analogy Dave! Never heard that one before haha

    @TitchgamerRG@TitchgamerRG8 ай бұрын

    • Maybe not Andy, but we've drunk plenty.

      @learnelectrics4402@learnelectrics44028 ай бұрын

    • @@learnelectrics4402 that we have!

      @TitchgamerRG@TitchgamerRG8 ай бұрын

  • Thank you sir

    @diyjan2580@diyjan25802 ай бұрын

    • Very welcome, thank you. Dave.

      @learnelectrics4402@learnelectrics44022 ай бұрын

  • Quality video.

    @slavko862@slavko8628 ай бұрын

    • Much appreciated, thank you. Dave.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Merci à vous,vous etes très gentil

    @mohsenk5985@mohsenk59854 ай бұрын

    • Avec plaisir et je suis heureux que vous avez apprecie la video. Dave.

      @learnelectrics4402@learnelectrics44024 ай бұрын

  • Well done, thanks for taking the time to share your knowledge. Is there a formula to find the amps on that nameplate at 13:10? I can’t seem to make sense of the amperage rating on the motor?

    @H750S@H750SАй бұрын

    • The amps are printed on the nameplate. Have another look. Thanks for watching. Dave.

      @learnelectrics4402@learnelectrics440229 күн бұрын

  • Fantastic explanation Dave. Im building a house at the minute and NIE are upgrading the existing transformer from 25 KVA to 50 KVA. DOes that mean 50000 volt amperes surely thats very high unless some is lost on the overhead cables plus its feeding other properties. I assume another transformer close to the build will step that down to 230 volts or near abouts to allow for voltage drop etc. DO you have a video on how electricity gets to a house etc.

    @AngelaPeters-fy1tc@AngelaPeters-fy1tc6 ай бұрын

    • Yes, the voltage will be stepped down to user friendly values. the reason the incoming voltages are so high is in order NOT to lose power in the overhead supply. I have thought of making a video on this, perhaps I should get it done. thanks for the prompt. Dave.

      @learnelectrics4402@learnelectrics44026 ай бұрын

  • Hi love the videos. Always come back to your content. Ok to ask a question tho. Client is upgrading to 3 phase from 2 phases in the application it asks for the kva. The upgrade is for 10 flats. Where would you get the figures for the equations if you don’t know what the main fuses will be. For example if you looking to fit a 315 amp 10 way distribution GFP10. Would you put 315 and 400 v ? Hope that’s clear enough. Thanks again

    @pooley2853@pooley285321 күн бұрын

    • We don't run 2 phase circuits. either 3 phase or single phase. thanks for watching. Appreciated.

      @learnelectrics4402@learnelectrics440221 күн бұрын

  • Great video and well explained. Thank you for making these amazing videos. I just have one question. Using the motor data plate shown on the video if the voltage (400) is multiplied by current (11) equals 4.4KVA. It’s lower than the true power shown (5.5KW). I thought the apparent power is always greater than the true power. What am I missing? Thank you.

    @pedromasquietto2265@pedromasquietto22658 ай бұрын

    • There are some calculations that will be part of the second video involving root 3, or 1.71 and so on. Watch this space and thanks for watching this one. Dave.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Working early!!!

    @willmacdonald6295@willmacdonald62958 ай бұрын

    • No, not me. Used the scheduler. Thanks for watching. Dave.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • Great video. Can I ask though I’ve come across various items and most of time they generally just show kva or Va rating so when choosing cable and breaker do you usually just work it out to that Va or Kva rating as that’s 100%? Thanks

    @alanmarriott9216@alanmarriott92166 ай бұрын

    • Yes, using the VA figures is ok. Have a look at this video on cable sizes. Dave.

      @learnelectrics4402@learnelectrics44026 ай бұрын

  • Thanks again,, i discussed the PF effect on the residual electricity bill,with several electrical engineers. The answer was no effect as we pay for KW not KV,,, do you agree with them ??

    @yanalnaghawai1872@yanalnaghawai18728 ай бұрын

    • In domestics we pay by kWh. Thanks for watching. Dave.

      @learnelectrics4402@learnelectrics44028 ай бұрын

  • at 1.04, you should not say "Current, the Amps". It is Current, measured in Amps. Less importantly, a dimensionless factor is usually expressed relative to unity or '1' You do say this, but then slip into expressing it as '%' which is strictly incorrect and unnecessary. You know your stuff, but you tend to over-state things by mixing your terms in a way that could confuse. If folk don't get it they will re-wind. Good series though. Each topic is the right length, delivery has a good pace, and a lot of effort has gone into producing clear, concise graphics.

    @whitefields5595@whitefields55955 ай бұрын

    • Thank you for watching.

      @learnelectrics4402@learnelectrics44025 ай бұрын
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