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.
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/
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?
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.
Hey Jim, I love your videos. However I've noticed that when talking about apparent power you say the formula is the complex conjugate of the voltage times the current. but you write that its the voltage times the complex conjugate of the current. I believe the latter is the correct formula, but please correct me if I'm wrong!
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.
@@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? 😔
ERROR at 38:42 Sin = EpIp*
Thanks for the correction
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.
Goated lecture!
"Put this in your pipe and smoke it." LOL this is why I love the internet. This is what I call effective education!
Great Lectures Jim. God Bless you. I have subscribed your channel
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.
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/
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?
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.
Hey Jim, I love your videos. However I've noticed that when talking about apparent power you say the formula is the complex conjugate of the voltage times the current. but you write that its the voltage times the complex conjugate of the current. I believe the latter is the correct formula, but please correct me if I'm wrong!
Correct. As long as you complex conjugate ONCE (and only once) you're good.
@@bigbadtech Okay. thank you for the clarification!
Very good Lecture!
Excellent Lecture!! Way to go!! I subscribed. :-)🦊
Please how do I locate the starting point of a transformer and can you show me. Thanks
Are looking for information about transformer connection diagrams? If so here's that lecture: ruclips.net/video/n9YflRWyXLY/видео.html
Return wire should also have resistance in calculation in last example
Will you take a subject “electromagnetic field and human health”?
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.
Mr. Jim please I had question, can I contact you by email please?
If theres anything i learned from this video, its that this makes sense
That makes sense!
Typo in the very last slide: Es * Ip = Es * Is ; should be Ep * Ip = Es * Is
Good catch! I made a note in the information and pinned comments.
No transformer no electricity.
When doing 120/220 I got 6/11 how did you get 1/1.83? Anyone?
220 is 1.83 times 120.NP over Ns.
120 over 220 is .545.
1 over 1.83 is also .545
@@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? 😔
Tenth