Understanding Inductance

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A video about the basics of inductance. The video includes an animation of an inductive circuit to help get an intuitive grasp of this concept. I had a problem with the audio on the first attempt and used an audio boost tool to fix the video.
Simulation software available at: phet.colorado....
Please like, share, or subscribe if you find this useful.
Thanks.

[@msuarez1976]

this is brilliant. never imagine seeing such a powerful, perfect explanation and with so much genius. you are the best of the best. finally I understand in all its dimension about the main components of electricity. infinite thanks to you.

[@DorianMcIntire]

Thanks so much for the high praise. Very glad you enjoyed and learned from the video.

[@zozo71zozo71]

nice!!

[@billclark9935]

The train did it for me -- the current lag always seemed difficult to grasp, but your explanation and illustration did it ...a big step for me in wrapping my head around this ..subscribed !

[@Spoolz07]

This is brilliant! The train analogy has enabled me to visualise what's going on here. Thank you so much for this clear explanation.

[@DorianMcIntire]

Glad you enjoyed the video. Thanks for commenting.

[@AirborneLRRP]

I have a superconductivity lab in modern physics tomorrow. I haven't worked with or explicitly studied inductors yet. This was a great into to get general ideas introduced. THANK YOU

[@DorianMcIntire]

You're welcome! Thanks for watching and commenting.

[@walterwhiteheisenberg2745]

this is one of the most helpful explanations for induction ever, thank you so much!

[@elflux6258]

this is probably the best concise, useful and clear inductance-tutorial I've seen. I'll spread the seed to my students. Thanks

[@DorianMcIntire]

+elflux Thanks. Comments like this really make my day. I hope your student find it useful.

[@elflux6258]

I can already imagine their surprise/eureka faces

[@DorianMcIntire]

***** Great.

[@TacoDaddy-mr8ig]

This is why i love inductors ❤😊

[@wadisanaa]

this is like getting knowledge through transfusion . Well done .

[@tedlahm5740]

Ended too soon. The inductor supplied extra voltage for a short time? Was expecting an open switch to allow current to continue to flow. thank you extremely good animation.

[@DashkaMilashka015]

this is just perfectly explained! if you like analogy with water, where voltage is a pressure then its just hits it right in the spot. try to bend a hose (increase resistance) and the pressure builds up. if the pump is pumping that is...) inertia

[@thegamerboy1000]

Oh my gosh dude you are the man!!! I went to several channels to help explain this to me and you did it perfectly because I’m a visual learner and that train analogy was just amazing! Thank you thank you thank you!!!

[@DorianMcIntire]

Thanks! Glad you liked the video. I'm a visual learner myself and I've been waiting for years for simulation tools, like this one, to help explain electrical concepts.

[@AvocaSingleTrack]

I like the train analogy. I've always looked at inductors as a Flywheel , it doesn't want to speed up or slow down quickly. Thanks for the vid.

[@DorianMcIntire]

+AvocaSingleTrack I usually do use the Flywheel analogy with my students but not all students understand the purpose of a flywheel. Also the rotary nature of a flywheel tends to confuse things also. Thanks for commenting.

[@SunilJadhav-pe4dv]

Wow..... Excellent explanation.. This concept clearly understood... Lots of thanks Sir

[@cannibol9009]

Dorian Mcintire: Superb explanation!

[@alaashanaa2683]

Thank you so much! You have no idea how helpful this was!

[@DorianMcIntire]

+Ayla Lanter Very glad you found it useful. Thanks for watching and commenting.

[@orignal29]

The analogy I like to use is when you have a bunch of kids that are all walking around a round pool in the same direction. Takes a while to pick up speed, but if you stop and lift your feet, you'll keep going.

[@gerrys6265]

Wow, finally someone able to unravel it.... simply Thanks so much!

[@SHIVGHAM]

72

[@fayis78920]

Liked the parallel with potential and kinetic energy !

[@nazh09]

Thanks for this video. for the very first time. i understand inductance

[@DorianMcIntire]

Excellent. Thanks for commenting.

[@stratproj6214]

Pls make similar vedio for capacitance

[@borisdorofeev5602]

Thank you, for the videos, very much. Liked and subbed for sure. This is why I love channels like yours, it's people like you taking time out of their day to spread knowledge.

[@DorianMcIntire]

Thanks!

[@GunsofBrixton89]

Thank you! I'll be prepared for tomorrows lecture and you saved me a headache.

[@DorianMcIntire]

Jose O Glad it was helpful. Thanks for commenting.

[@DorianMcIntire]

+Prashanth Budihal I'm very pleased you found the video useful.

[@donaldson7111]

This is an amazing video. Best explanation I found

[@Greg_Chase]

Presenting the counter EMF that is produced in the coil as a manifestation of Lenz's Law will help. Here's the fine details of the reason it take time for full current to flow in the inductor: 1) battery connected to circuit, current starts to flow, magnetic field therefore begins to build up around the wire and the inductor 2) the building-up magnetic field actually causes electromagnetic induction **onto the coil** - the changing magnetic field induces a voltage in the very same wire (the coil) that is creating the initial magnetic field 3) the voltage induced by induction onto the coil by the initial magnetic field IS OPPOSITE the voltage in the circuit and creates current flow/magnetic field IN THE OPPOSITE DIRECTION of the initial magnetic field - *_this is Lenz's Law_* 4) an equilibrium is finally reached - the initial current caused by the battery reaches a maximum. That means the initial magnetic field STOPS CHANGING (stops increasing). Because the initial magnetic field stops changing, the back EMF (Lenz's Law - back or reverse electromotive force, aka reversed voltage) goes away This subtle point is skipped over in many electronics courses. I found what is generally taught is "it takes five (5) L/R time constants for the magnetic field to build up" with no explanation as to 'why.' The 'why' is the SELF-INDUCTION of the primary magnetic field right back into the coil, in the OPPOSITE DIRECTION. The five L/R time constants accurately accounts for the time it takes for the self-induction to stop fighting against the initial current and magnetic field from the battery. Having taught the subject, many students are surprised about the self-induction as the cause for the delay in reaching max current through the inductor. I explain it this way when that happens: 1) "Remember Faraday's law of induction - where a changing magnetic field induces an EMF in a conductor?" (students: 'yes') 2) "Remember Lenz's Law, which completed Faraday's law of electromagnetic induction by putting a negative sign on the induced voltage?" ('yes') 3) "When the battery is first connected to the circuit and current begins to flow and the initial magnetic field begins to build up in the inductor, do we have a changing magnetic field?" ('yes') 4) "Is there a conductor near the changing magnetic field?" ('yes') "Is the COIL the conductor next to the changing magnetic field?" ('yes') 5) "What is the direction of induced EMF (voltage) that occurs in the coil by the changing magnetic field? Hint: Lenz's Law" ('it opposes the initial current from the battery') 6) "So the self-induction onto the coil opposes the initial magnetic field?" ('yes') Some students will say "but shouldn't the coil KNOW that it should not allow its growing magnetic field to trigger Faraday's law of induction ON ITSELF?" to which I say "the wire is not sentient, it does not know. You can say the WIRE IS SELF-DEFEATING if you want" I then point out "if the self induction back onto the coil was NOT in the opposite direction of the initial magnetic field - but was instead in the SAME DIRECTION - the magnetic field would keep growing and growing, which Nature would never allow"

[@rubykucla]

really like the animation. glad you put this out there - made me curious about some q's and confident about others I had.

[@jactotum]

I like to think of inductors like a pinball machine. Think of how there's 2 belts in some pinball machines that move clockwise and counterclockwise that force the ball through them, causing them to speed up. That represents the magnetic field that is being created by the current passing through the loops. Since the current that flows through the loops it was brings on the magnetic field, the speed at which the field thrusts out the electrons is dependent on how long electrons have been flowing through it, allowing it to build up speed.

[@charliedelacruz8555]

Amazing presentation keep it up.Godspeed:-)....

[@shivangraina8634]

best video ever on inductance..simply loved it..

[@DorianMcIntire]

Thanks, comments like this make it worthwhile to create such videos.

[@suf6716]

helped me a lot keep doing this great work

[@DorianMcIntire]

+areej fatima Thanks for your comment. Comments like these keep me going.

[@jonathanescott2076]

very easy to understand

[@TheAgonistfan]

Great video, helped me get through avionics. Can't thank you enough man

[@DorianMcIntire]

+TheAgonistfan Glad you found it helpful. Thanks for commenting.

[@navindraarjunaabeyesekera7864]

Very good explanation

[@TheDigitalAura]

Thank you so much, excellent description and finally I get it! This had been quite a barrier for some time now.

[@DorianMcIntire]

Great! I'm very glad the video helped. Thanks for commenting.

[@SHIVGHAM]

Sweet Dreams 4truth under..

[@prashanthb6521]

I am indebted to you sir !

[@mocococo2877]

Yes, very imaginative explanation of such a phenomena. Thank you. So seems like if the resistance gets changed to 100 ohms, there will be a 200 Volts spike. And if we speculate a little more, i.e. we open the circuit which would make an infinite resistance, then the voltage spike will also get infinite. I think I can remember from 20 years ago when I studied electronics that such a pumping of voltage has many applications. But can't remember details. I would guess that may be for some pulse power supplies ...?? Thank you, once again.

[@blinkojei]

Beautiful ...easy to understand and interpret. Make more topics on electric circuits please. Thanks

[@DorianMcIntire]

Chykes Ojei Thanks. Yes I will make create more videos about electric circuits and really appreciate it when I receive such comments..

[@izazalishah1334]

Very helpful and easy to understand........thanks

[@dardale9050]

Great video! And it was correct with Electron Flow😊

[@montazmeahii6029]

Very good video. Needs more likes though.

[@DorianMcIntire]

Thanks for your encouraging comment. More likes would be appreciated.

[@martinmartinmartin2996]

Simplistic explanation of the complex phenomena of the inductor ! Why is it complex ? because the explanation points out that the current is 0 when the switch is closed, yet the inductor generates a voltage that opposes the battery, to make the current is zero (or almost zero a moment later) . How does that happen? The explanation is excellent in other respects though. The viewer should be cautioned that the explanation is not rigorous which would require a lengthy and more mathematical discussion.

[@DorianMcIntire]

The point of the video is to help provide an intuitive understanding of how reactive components differ and what that difference means. The problem, when beginning with "rigor", is that it typically frightens people from taking that first step toward understanding. Most of the comments I receive from viewers is that KZbin is filled with presenters who seem to enjoy showing off their personal "understanding" of a subject instead of helping others learn.

[@lightningmcqueen1577]

It would be awesome if you do some mathematical analysis and do some graphical stuff

[@harshabm7289]

Thank you thank you.

[@tedlahm5740]

Stated incorrect at the end of video. 10 volts divided 10 ohms. When it was meaning to say 2 volts divided by 10 ohms equal .2 amps. thank you.

[@engineeringmaniac9696]

Brilliant

[@bcyalcin]

congratz, nice explanation

[@mrmen171]

how about some Ac source?

[@WalidsChannel]

Great explanation. Could I know which software is this for circuit simulation ? seems helpful for circuit analysis.

[@DorianMcIntire]

A link to the information you're looking for is shown 10 seconds into the video. This is free online software.

[@shivangraina8634]

If inductor stores energy like a capacitor will it provide current to a circuit without any emf for short peroid of time just like discharging of capacitor?

[@DorianMcIntire]

An inductor creates emf when it's magnetic field collapses and this EMF tries to keep the current flowing as long as it can until it runs out of stored energy. Capacitors store charge and attempt to keep the voltage at a certain level until it runs out of energy.

[@OpenGL4ever]

This is the url about the simulations: phet colorado edu/en/simulations/category/new

[@emmanuelbabu2215]

Great video...👍

[@DorianMcIntire]

Thanks!

[@UmitDurupinar]

So how can we calculate correct coil (coil diameter, wire diameter for an induction heater?

[@DorianMcIntire]

Umit Durupinar Induction heaters work best with only a few turns of copper pipe for best results. The following link shows many induction coil designs and they are usually made of copper pipe cooled by water circulating inside to the coil: www.ambrell.com/PDFo/411-0168-10.pdf. Select a parallel-capacitance value for the coil for resonance near 100khz (aluminum) or lower frequencies for iron the following link contains formulas for finding the inductance of a coil based on its size, number of turns and the permeability of the core (air is the core for a heater): www.ajdesigner.com/phpinductor/inductor_equation.php. This is not a trivial project since huge currents are involved and very fast switching times (not the same as frequency) are needed. See the following link for an Instructables article about building an induction heater: www.instructables.com/id/30-kVA-Induction-Heater/ Good luck on your project.

[@UmitDurupinar]

thank you sooo much :)

[@Tangled6566]

thank you!!

[@thomasjones145]

the bass on that intro tho

[@Traderhood]

Thanks!!

[@panditatuldhar]

Rather than mass I think moment of inertia seems a better analogy

[@haitham5104]

hello sir >>>>can tell me what program are you using to build the circuit

[@DorianMcIntire]

The information you're requesting is mentioned 10 seconds into the video. The link is: phet.colorado.edu/en/simulation/legacy/circuit-construction-kit-ac

[@haitham5104]

Oh...thank you sir

[@harishankar5245]

what software is that where can we get that

[@DorianMcIntire]

Look in the video description for details.

[@RizwanKhan_99]

But in an AC source, a pure inductor does reduce the magnitude of current, doesn't it?

[@DorianMcIntire]

Yes. Think about the fact that if an inductor resists changes in current - whether the current is increasing or decreasing - then it will always resist an continually changing current like currents provided by an AC signal.

[@RizwanKhan_99]

You said in the video that magnitude is not reduced i.e. resistance to the change in current (whether increase or decrease) only results in 'delay' in current waveform and not decrease in magnitude or peak of current waveform. But in actual, inductance does both - delay in waveform as well as decrease in peak of the current waveform. this second thing i think u didn't mention in the video.

[@DorianMcIntire]

The delay means that current and voltage are out of phase. If this is true then applying an alternating voltage across an inductor results in a current that may never get to the value you might ordinarily expect. A demonstration like this is the best way to approach teaching about reactance due to the phase shift issue.

[@sergejpanov5543]

At 7:55 should say 20 VOLTS not amps. U=IxR

[@DorianMcIntire]

Wine AndGravy Typo fixed. Made this video late at night.

[@dylanthorner]

Could you send a link to me of the link you used for this demo? It's an interesting app

[@DorianMcIntire]

This is a circuit simulator available from PHET at the following link: phet.colorado.edu/sims/circuit-construction-kit/circuit-construction-kit-ac_en.jnlp This is a Java application so you must grant permission to run the app.

[@dylanthorner]

Okay. Thank you very much.

[@atharvas4399]

wow, where is the simulation from?

[@DorianMcIntire]

Check out the following link for the AC/DC construction kit: phet.colorado.edu/en/simulation/legacy/circuit-construction-kit-ac

[@shvideo1]

I thought any energy that is stored is called potential energy because the very name indicates that the device has the "potential" (energy) to do work for you. Storing kinetic energy does not make any sense to me because the word kinetic indicates energy that is moving!!

[@DorianMcIntire]

Potential energy is energy possessed by an object due to a force applied to the object (e.g. gravity, spring, etc). Kinetic energy is energy possessed by an object due to it's speed (e.g. high speed car, bullet, etc). A bullet posses very little energy due to it's weight (force of gravity) but it posses a huge amount of energy due to its speed while moving). I suggest that you Google the terms. I electronics the moving electrons posses energy since moving electrons create a magnetic field and this magnetic field posses energy.

[@singhyuvraj122]

Pls give me link for downloading simulator

[@DorianMcIntire]

phet.colorado.edu/en/simulation/legacy/circuit-construction-kit-ac

[@Gregory-the-small]

Software?

[@DorianMcIntire]

10 seconds into video

[@carlosmante]

14 people are "capacitors". ha ha.

[@navindraarjunaabeyesekera7864]

Very good explanation

[@tanushchandra6879]

I am indebted to you sir !

[@DorianMcIntire]

Thank you for your comment.