you are really good at writing backwards!

I like the way you have a black background with your markers rather than a whiteboard. It saves me from headaches. Also, very well organized and delivered. Thank you

Excellent presentation. I have a variable autotransformer, cheap Chinese "Variac" but Variac is a brand. Thinking about the common leg currents is important not to exceed the current rating of the windings.

Greetings from Poland. Polish sources found on Polish KZfaq are not as good as your video. Thank you for the content. You go into the matter even deeper than my books!

Thank you for the great explanation

Thanks for the video It helped me a lot

thanks great presentation

Awesome videos!!!

Made it very easy to understand best explanation of Auto transformers i have seen really big help thanks im subscribing

Excellent.

Thank you so much sir ❤🙏

you're a life saver

Good job, very clear with exampe!

Nice concept ❤

Thank you kind Sir

Yes this video helped me a lot. Big merci beaucoup

Hello Zack, enjoyed your video. I think it is important to review transformer polarity when connecting a "mutual induction transformer" as an autotransformer. Obviously, that will determine whether you have a voltage increase or decrease relative to the source. Maybe you covered this in another video?

The series of videos you have posted about autotransformers is really appreciated. I have an autotransformer to wire for a small drilling machine, I need in the Primary : 480VAC and in the Secondary : 220 Having an autotransformer 3 PHASE 15KVA with the name plate as follows : HV: 600Y/346V (60HZ) 14.4A AND 480Y/277V (50/60HZ) 14.4A LV: 480Y/277V (60HZ) 18.0A AND 380Y/219V (50/60HZ) 18.A Can I possible get 219VAC ? I did a test : Connected 3 PHASE 480VAC on the Primary and on the secondary I got 375VAC, how do I get the 219VAC 3 PHASE ? There's a NEUTRAL wire in the transformer Any input would be also appreciated

Never stop making this videos. Came across your videos and my God you deserve more subscribers. Sad yo see you have very less viewers per video. You videos will be watched over and over again by students over the years. Love your work and would love to connect with you on LinkedIn.

Excellent video, thank you very much, I hope you keep on making videos like this one … you need to put “PE electrical review” in your videos to increase your number of viewers

Great

Legend .

Helped me a lot, the only thing I don't understand here is conversion of a mutual transformer to an auto transformer. Do you mean an 1:1 isolation transformer? Since using any standard step down transformer may mean that the primary and secondary may have different current ratings, not only that, the reduced secondary voltage common on most transformers may only allow for a small change in the auto transformers voltage. did you mean a 1:1 transformer. I'm new to all this, could you please explain. Also, how could I tap of midway on the secondary side?

Saved me before my test tomorrow. Dyanyavatt

Could you please explain the difference between a 120 volt variac and a 240 volt variac please as al the ones I have seen seem to have the same sized winding for the same VA.

Auto transformers are used a great deal by utilities for voltage regulation, in voltage regulators.

Ha ha ha, I had no idea I was so ignorant about this topic.

I have question 🙋 can we do the insulation test or megger of auto transformer if yes please tell me what will be the connection of megger while testing.

I really enjoy your videos. I don't understand why the views are not yet in the thousands yet. Maybe key words?... I have an unrelated question. Let's assume I do the same exercise of having a regular 2KVA transformer 480:120V. Even if there might not be a use for this, but if I like to calculate the Apparent Power connecting it as an autotransformer but with the same ratio; 480:120. My S Transformed will be 16.67Ax120V, but what would be my S Conducted?, thus my Total S? This exercise is driving me crazy. Hope you could assist. Thanks Zack

230 v primary howmany turn required And 60 v secondary which point turn should i tap

Nice video. But according to this video the secondary (the load) current will increase so how dose it help by limiting the start current for an electric engine ? Thanks

Hello, great explanation! Would you please give me a help into an exercise that i'm trying to solve? A single-phase autotransformer rated at 40KVA supplies a lead impedance of 4

How could you use this with say a conventional 120v/24v isolation xfmr. What would you do with the neutral of the 120v source voltage

How do I choose the right autotransformer for the pump? for example 30 hp pump 3ph

Hello, it's impossible, I found out the answer, but I am still wondering what the /277 or /219 are intended for, what good is it to know that Neutral and a Phase would result on /277 or /219 as an example, what's the need of those measurements in the industry ?

So, oddly when i think of auto transformers, I think that my input voltage can vary, but my output voltage wouldn't vary nearly as much. How does that work?

Hi Zack, my understanding of Auto Xfmrs is that the 5kVA is the rating of the primary and the secondary. As such the VA of each will be equal, the Source and Load will be equal to each other also, but much bigger than the 5kVA of the Xfrmr pri or sec. Comment?

Hi Sir. how did you get that 4.1A?

Hello sir, i just wanna ask about this kind of transformer KOWA DENSO ltd.. A80L-0001-0225-02 Where to get the IN 220V and out 100V.. tnx

Is there any formula to calculate the voltage from number of winding

The ignition coil in my old truck has a classic autotransformer design, stepping up voltage from 12V DC to 17,000V. For some reason I assumed the shared neutral pole (that ties the chassis ground to both arms of the transformer) was in the middle, in which case there would be no common winding that carries the sum of current from both sides. I assume the gauge of wire is different on the two sides, since higher gauge wire is only needed for the few turns of low voltage wire. Is there advantage to having the common chassis ground connection tied to one end of the coil, so the current going through the common end is subtractive?

Why must autotransformers be grounded?

Can I contact you through email? I need some assistance on a circuit that I am assembling. There is an inductor that I don't know exactly how to build. I'd like to send you the circuit diagram.

writing everything backwards aswell

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