Introduction to Transformers (Full Lecture)

ERROR at 38:40 Sin = EpIp*
In this lesson we'll examine the transformer, an electrical device used to step up or step down AC voltage. We'll learn the turns ratio, the number of turns on the primary over the number of turns on the secondary, is directly proportional to voltage and inversely proportional to current. Additionally, we'll learn that a source supplying current to an ideal transformer sees a reflected impedance equal to the load impedance times the turns ratio squared. We'll assume ideal transformers are 100% efficient, and operating under this somewhat dubious assumption, we can say power in equals power out. Finally, we'll learn that transformers are essential component of the modern electrical grid and make it possible to transmit electrical power over vast distances with minimal losses. (Full Lecture)
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[@bigbadtech]

ERROR at 38:42 Sin = EpIp*

[@NutriTalkInspiration]

Thanks for the correction

[@NutriTalkInspiration]

I normally pace my time with the lectures but I was so excited about learning transformers that it was difficult for me to stop watching this lecture.

[@metalheadmax09]

"Put this in your pipe and smoke it." LOL this is why I love the internet. This is what I call effective education!

[@nabeelest]

Goated lecture!

[@ElectricEssenceLtd]

Great Lectures Jim. God Bless you. I have subscribed your channel

[@AmsSma]

Very good Lecture!

[@foxpup]

Excellent Lecture!! Way to go!! I subscribed. :-)🦊

[@johnnyreaver311]

I'm paying $17,745 per year to attend a university, and this free, 40-min youtube video taught me more about transformers than an entire semester of Electrical Network Analysis.

[@bigbadtech]

Very nice! Glad you're making use of this material. Please tell your classmates these resources exist. Also, check out the free study guides at: openoregon.pressbooks.pub/electronics2/ and openoregon.pressbooks.pub/electronics3/

[@adnansaeed175]

Return wire should also have resistance in calculation in last example

[@eddy4890]

If theres anything i learned from this video, its that this makes sense

[@bigbadtech]

That makes sense!

[@spelunkerd]

For the longest time I wondered why a transformer with an open secondary won't allow current to flow on the primary side. After all, if it behaves like a simple inductor, it would allow increased current after the magnetic field is established. More recently, I realized that the magnetic field produced when current starts to flow in the primary will magnetically induce electrons to flow along the secondary coil, with nowhere to go! The open circuit would quickly lead to a contrary voltage drop along the secondary windings. Presumably when first started the flow would oscillate back and forth until a steady state balance is achieved, with static ratios of voltage drop on the two sides commensurate with the turn ratio. So, a transformer with an open secondary would build up huge impedence to flow along the primary winding, effectively shutting down almost all flow. Is this the correct explanation? Is it accurate to say that any resistance within the secondary circuit in a functional transformer leads to an opposing secondary magnetic field that increases impedence on the primary side? If you were to measure the strength of magnetic field, would it be more powerful in a functional transformer or in a transformer with open secondary?

[@bigbadtech]

Now you've done it! I've got a 14 hour drive ahead of me and I'll be thinking of this the whole time! The suppositions seem on target. Also check out the "Non-Ideal Transformers Lecture" that discusses a slightly more realistic version of a transformer.

[@mariangringo]

Will you take a subject “electromagnetic field and human health”?

[@bigbadtech]

Full disclosure ... I have limited knowledge of medicine beyond the 200/300 level chemistry/biology/o-chem/anatomy courses I took on a lark one year so anything I mention is subject to correction from a more qualified source. Long story short, when I learned about the methods proteins use to fold together and the disulfide bridges in DNA and how essential these processes are to our continued survival I kind of sat up a little taller in my chair and made an effort to listen close.

[@preciouschy8268]

Please how do I locate the starting point of a transformer and can you show me. Thanks

[@bigbadtech]

Are looking for information about transformer connection diagrams? If so here's that lecture: kzbin.info/www/bejne/pGq8l5-IjN6Lgrs

[@raedslekh133]

Mr. Jim please I had question, can I contact you by email please?

[@amramjose]

Typo in the very last slide: Es * Ip = Es * Is ; should be Ep * Ip = Es * Is

[@bigbadtech]

Good catch! I made a note in the information and pinned comments.

[@ohmedarick1]

Tenth

[@mariangringo]

No transformer no electricity.

[@lastbaratheon8043]

When doing 120/220 I got 6/11 how did you get 1/1.83? Anyone?

[@bigbadtech]

220 is 1.83 times 120.NP over Ns. 120 over 220 is .545. 1 over 1.83 is also .545

[@lastbaratheon8043]

@@bigbadtech Yes, 6/11 Gave me 0.54 recurring. For the rest I got IS: 0.848 A PS:186.12 VA ZL= 76.32 Reflected ZL: 78.22 My numbers are close but I prefer to get the same numbers you got. Is there a way to derive 1/1.83 from 6/11? I'm sorry for my late response? 😔