Inductors (Full Lecture)
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- Опубліковано 15 жов 2024
- In this lesson we'll examine the inductor, an electrical device that can store energy inside a magnetic field in a coil of wire. We'll examine basic electromagnetic interaction, the concept of inductance, inspect inductor construction and discuss how properties like cross sectional area, number of turns, coil length, and the magnetic permeability of the core influence inductance. Additionally, we'll briefly discuss the shoddy and unpredictable means manufacturers use to label inductors and learn how to measure inductance using an LCR meter. Finally, we'll learn how to calculate total inductance of series and parallel relationships of inductors. (Full Lecture)
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thank you for not going into calculus. your material is the only one iv found that doesnt assume I've spent the last 10 years studying calculus & physics. I'm a mature student so whatever I learnt in maths/physics 12 years ago is completely gone.
Very clearly explained; So well that I can visualize it. This lecture takes out the mystery of the inductor in an intuitive way. The complex equations that were forced down our throats in college without the clear and intuitive explanation of the physical phenomenon were interesting but meant very little in the scope of life. The text books published by some hotshot professor trying to make a name for himself were dismally explained. They were so boring and a kill joy that even many years later when I tried to re-grasp the concepts and tried to read them left me frustrated and bored to death.
When something is as physical as this simple component in the way it works and responds to it's surroundings, it's imperative that every teacher / professor makes the best effort to bring it to life. Thank you for your great video and taking the great pains, manifested in the details and the quality of the content here, of sharing your knowledge. The Big Bad Tech is da man! Da man with da simple and clear answer.
really appreciate these videos, came to this playlist to get capacitor & inductor introductions, now jumping back to AC playlist, sadly no time to get through this playlist
Hello Jim,
Do you have a video with explanations on inductors in orthogonal configuration, and its applications? I have not seen anything on video about this.
Thanks a lot for sharing your knowledge with the world.
If this lecture is “inductors level 1” orthogonal inductors would be level 5000! I have a hard time just getting my students to show up to class on time!
Hi Jim,
could you vaguely explain where does this "voltage/current is proportional to the inductor" formulas come from? I cant make it "fit" into my calculus based concepts and I cant imagine how inductance can limit current/voltage in a DC circuit (I always thought that would be a short circuit because of low resistance in DC)
Hi Jim, love your explanation here - you do an excellent job as an educator! Your videos have been a great help to me and are entertaining as well as thorough and informative.
However, I'm a bit confused by your examples of Lenz's laws (~ 10:35 - 14:30); if the induced voltage opposes an increase in current in example 1 and opposes a decrease in current in example 2, shouldn't the voltage be negative (with respect to the direction of the current) between t=1 and t=2 in the first example, and positive between t=1 and t=2 in the second example? Am I missing something?
Don't go too deep in to the mechanics of it ... you'll drive yourself crazy! Big thing to remember is that the expanding and contracting magnetic field momentarily keeps current stable (ie: if current goes up current is momentarily choked, if current goes down the coil will "squeeze" current out). The diagram is showing current "internal" to the coil (ie: not in a circuit). When we look at a circuit external to the coil in the next couple lectures you'll see how the polarity of the voltage across the coil influences current in the larger circuit.
No worries - thanks; I look forward to it :)
I don't understand how there are "voltage drops" across inductors based upon their inductance values. I'm new to this, but that doesn't fit my understanding of inductors in a series DC circuit becoming essentially shorts once steady state is reached. I also tried this in LTSpice and it seems to agree with me, no voltage drop across inductors when supplied DC in a series circuit. Will try it in a real circuit shortly to see what I get.
Yes at steady state inductors appear as short circuits however there is a transient voltage spike anytime current changes. Check out the storage and release lecture at: m.ua-cam.com/video/3NvFNJKDCGY/v-deo.html
@@bigbadtech Are you saying that this principle only applies at t=0? Your next lecture "Inductor Storage Process" shows the full progression which makes a lot of sense. btw, not trying to be difficult, this lecture just confused me. Great series. I recommended them to my Electronics instructor at College of San Mateo to supplement his classes. Really much better than anything else I've found.
Hi Jim, I'm new to all this, I've heard of a left hand rule that works in a similar way, is there a difference?
Check out the "Electromagnetic Interaction" lecture at: ua-cam.com/video/fv5494lRQAs/v-deo.html
Using conventional current (ie: flow from + to -), the left hand rule predicts the direction of movement for a current carrying wire in a magnetic field.