Inductors: making high voltage from low voltage

[@kashpatel9979]

Excellent demonstration of a boost converter in it`s simplest form!

[@elewizard]

Glad it helped!

[@twithheldmwithheld8938]

😁I am always checking and hoping that you have published another video. Your knowledge and way of showing practical uses for everything is indispensable. Please keep them coming!

[@elewizard]

Wow, thank you! I am so glad of that 😃 By the way, cheers to you for the awesome $25 Super Thanks! 🥂

[@bobvines00]

@twithheldmwithheld8938 Set the "bell icon" to notify you of any new videos as soon as @elewizard posts one. The "bell" in the top right corner (at least on a computer/laptop) shows when there are new videos to all channels that you subscribe to, *if* you clicked the bell icon and its "down arrow."

[@Tutterzoid]

I love that .. Asking for a LIKE after 6 minutes of content, and not like so many others that ask for a LIKE and Sub within the first minute of introducing themselves only ..

[@elewizard]

Content producer have to give first 😉

[@t33th4n]

Should have been obvious, but now I understand the purpose of the resistor in the circuit and how to calibrate the output voltage. Thank you!

[@elewizard]

Awesome 👌

[@KyriosApo]

What is the purpose of the parallel resistor? Couldn't the inductor charge just the capacitor without the parallel resistance?

[@turk4082]

@@KyriosApo Inductors use current to release their energy, but capacitors are technically an open circuit. Without the resistor, the inductor would have no way to release its stored energy that created a voltage difference across the capacitor. So the short answer is that the resistor is what creates the voltage difference across the capacitor, otherwise you would have no voltage drop across the capacitor, which means no stored energy.

[@KyriosApo]

@turk4082 Thank you for your response. The capacitor is an open circuit after it has been charged. During its charging state it is not an open circuit, current runs towards its terminals in order to create charge. The LC circuits work this way. The inductor charges the capacitor and vice versa, except if you put a diode in between. That' s why am I asking what's the purpose of the resistor...

[@CedarPass]

I had a short, skinny friend named Henry once. Crazy they use him as a measurement these days.

[@MrSpaz12]

Your explinatin of the circut actually helped me to understand it in a easier way. Thank you.

[@elewizard]

Glad it was helpful 😌

[@kanematthews8841]

Bro thanks you

[@michaelgardner1681]

I like the way your circuit started simple and progressively became more sophisticated. Easy to follow and understand.thanks for sharing 😊

[@elewizard]

Thank you for watching 🍻

[@MlokKarel]

Great explanation, as always! 👍

[@elewizard]

Big thanks for the 100CZK support! 🚀, You made my day bro🍻

[@rocket2739]

If KZbin was filled wich such content, the world would be a better place

[@elewizard]

Wow, thanks 😊

[@nimamohamadian9875]

honestly one of the best video about self and inductors in the circuit, thank you 🙏🙏

[@elewizard]

Wow, thank you 😊

[@aristidisgalaris3334]

The best video for someone to understand inductors! Thank you!❤

[@elewizard]

Glad it was helpful!😊🤗

[@johnkerley4152]

I got to say I took notes from this video......thanks!

[@ALEFILES]

I am exploring making a circuit for testing LEDs and Zeners, using an 18650 battery and a toroidal transformer to obtain up to 100 Volts at the output, and you have read my mind, and made this wonderful video! And still practicing my English too, thanks to your clear pronunciation! Greetings from Argentina!😄

[@ALEFILES]

@@DonnieLuve Muchisimas GRACIAS por el dato, saludos!

[@tiagoandradedeoliveira8703]

You're the absolute best electronics teacher. Please keep up! i love your work. Thank you!!

[@elewizard]

Thank you so much for your kind words. I'll do my best to keep these videos coming 👍

[@scottfoulk7480]

Wow! Lots to think about; and of course like these short and to the point. Great setup - I thought you were going to place an electronic switch in there at the end, but you basically made your own with the function generator and the pnp transistor. Amazing!

[@elewizard]

Yeah 🫡. Glad you enjoyed ❤️

[@floorpizza8074]

I am a complete newb when it comes to electronics. You are such a great teacher that even I understood. Instant thumbs and subs.

[@elewizard]

You are very welcome ❤️❤️❤️❤️

[@Matt-wb7lm]

Everyone else has already said it. Brilliant explanations.

[@nimamohamadian9875]

یکی از بهترین ویدیوهایی بود که. توی تمام این مدت ها دیدم ، پر از نکات آموزشی بود ممنون که اینقدر دقیق و علمی توضیح میدین و در کنارش هم به صورت عملی آزمایش میکنید خیلی خوب بود این ویدیو مثل بقیه کارهای شما استاد عزیز و کلی نکته خوب یاد گرفتم ، سپاس فراوان

[@elewizard]

Thanks dear Nima, my friend. Glad it was useful 👍

[@ValuedTeamMember]

Outstanding eXplanation & demo. I'd like to "induct" this video into the KZbin hall of fame. Cheets!

[@elewizard]

Thank you for watching Cheers 🍻

[@RandomerFellow]

Congratulations to you. Brilliantly explained and visualized.

[@elewizard]

Wow, thank you 😊

[@tompeters8696]

Thanks for clearly explaining this difficult concept. This makes it easy to understand.

[@elewizard]

Glad to hear that!😊

[@hichamtassi1753]

Very well explained, thanks and greetings from Morocco.

[@elewizard]

You are welcome my friend 🧡

[@prestonashworthmusic]

This was a great and simple explanation, thank you!

[@elewizard]

Glad it was helpful!🫡

[@cpk001]

I love the way you explain things, thank you

[@elewizard]

You're very welcome!

[@ThompYT]

you are a very great teacher, this helps me with my university work!

[@elewizard]

Wow, awesome. Cheers 🍻

[@TYLER_DURDENIN_CEKETI]

now ı understand the concept of the ınductors thanks

[@elewizard]

Awesome 👌

[@ddxdPL]

briliant materia!!

[@elewizard]

Thank you so much ❤️ 💓 💗

[@soulslayer59]

This is one of the best explanation I have come across ...I love this way of teaching..thank you so much ☺️☺️☺️

[@elewizard]

Awesome, very welcome 🫡

[@soulslayer59]

@@elewizard really thank you again!! Also for the gate voltage u used a function generator to trigger itat 5khz to step up voltage ....but how can we do that same thing without a function generator.. is it possible to use a similar concept of zvs oscillator? I hope I am right? I am new to electronics ...thanks

[@truckywuckyuwu]

This was a great video honestly. I have always struggled understanding electronics, it's like a mental block, but after this, I had a much easier time after watching it. I've been able to get by with what limited knowledge I did have, I can fix most things(that aren't made of a bunch of ICs), but this is something that can help when designing something, which is where I struggle most. BTW, It's great that you speak two languages. If you don't mind, a suggestion from my experiences with my 2 languages, as well as my girlfriend when she was learning hers. Exaggerate your pronunciation. It helps you over-come the way your mouth usually forms words and sounds in your native language and retrains it so that it's more flexible. Helps minimize the impact your accent has when practiced enough because it helps show your mouth how words are formed in different languages. Your English is actually really good, I just thought you might like a suggestion like this because you're obviously trying to reach English speakers on KZbin, and it would help with that.

[@supremeleader5516]

Wow, amazing man, 🤩 now I got how smps works. No words to express my joy

[@elewizard]

Awesome 😃

[@raedshaher5186]

Really good explanation! Showing the circuit on the breadboard was really good too! Thanks for teaching me something today ❤

[@elewizard]

Happy to help!😃😃😃

[@BillionaireMind-ku9df]

This is an excellent channel,that teaches more about electronics then an engineering colleges, Love you sir❤

[@elewizard]

Love you too. I appreciate your kind words ❤️

[@joereyes8835]

Very interesting now I can use and FM antenna as an initial voltage and wa la😊 it would be ideal for my project, Thanks very much.

[@scottwalker9766]

Whats even more amazing is that these are universal laws. They apply to a lot more than electronics.

[@elewizard]

Yes, exactly 👍

[@scottwalker9766]

Electricity is all about divide and conquer.

[@alfieroseburg8887]

Its nice you include calculations as you add components. Very well explained.

[@elewizard]

Glad you like it!👍

[@RajaaDima]

Thanks for your efforts ❤️, first time circuitry feel entertaining and somehow easy to understand for me, although I didn't get everything in this video because I don't have the basics of this science

[@elewizard]

Glad the video was helpful 😃

[@MorganSullivan]

Oh! You just discovered transformers!! Well done!!

[@marcfruchtman9473]

Transformers?

[@MorganSullivan]

@@marcfruchtman9473 trannies??

[@elewizard]

Thanks! 😃

[@nismocapri1]

Thanks for your helpful videos!

[@elewizard]

My pleasure!

[@ExplainingMathematics]

Thank you for amazing explanation. SIBSCRIBED and LIKED👍

[@elewizard]

Welcome aboard 😀

[@jackson-aka2gs749]

great video. a quick and easy to conceive working knowledge of inductors. thank you, it corrected my incorrect concepts. i will give you a /sub for that!

[@elewizard]

Welcome aboard 😀

[@RMalsawmtluanga]

I have been watching your videos and subscribed to your channel for more than 2 years now. Very awesome videos and you have improved in quality and content. Feedback: The only thing I would like to suggest you to help improve your channel is by using a higher qualty microphone or do something about the audio as your voice is sometimes too low and your voice becomes distorted (clipped) sometimes and difficult to hear your voice. Anyways love your videos keep making educational and great videos in the future. All the best!

[@elewizard]

Thank you my friend for being with me for more than 2 years ❤️ Your suggestion is noted ✅️

[@Taliesen.]

great explanation

[@elewizard]

Glad you think so!❤️❤️❤️ cheers 🍻

[@anvarkurbanov951]

Thank you much, brother. As always, great! Looking forward to the next one

[@elewizard]

Keep watching mu friend

[@Franky2A3]

In the last circuit showing how to generate a higher voltage than the source. You should also measure the source current vs the output current. I might just do it myself.

[@Nion1957]

Thank you .

[@elewizard]

You are welcome!

[@KbB-kz9qp]

Thank you much!

[@elewizard]

You're welcome!

[@The_NASA_GUY]

That’s a cool project.

[@elewizard]

❤️😊

[@francisyinebome1165]

This is amazing

[@elewizard]

Thanks for the compliment ☺️

[@daemonghatak]

That's a great video

[@elewizard]

Thanks!

[@onemytech196]

Obviously valuable video

[@elewizard]

Thank you so much 💓

[@Wil_Bloodworth]

This was excellent but I was not able to get it to work in a simulator. I wish you had posted the exact values of the components you used in the final example. Thanks for the video.

[@Wil_Bloodworth]

I take it back... I was able to get it to work! Originally, I had the simulator speed too slow to see it working correctly. Once I sped it up, it came to life. Thanks again!

[@elewizard]

The values are correct. I have no idea why your simulation goes wrong.

[@jluke6861]

Great Video.

[@elewizard]

Glad you enjoyed it

[@jp040759]

Volume was great. THANX. Good inf on inductors. Magic component. Tricky to understand enough to apply. What was the duty cycle of the pulse train you injected into the base of the transistor?????

[@elewizard]

It was 50%

[@jp040759]

@@elewizard THANX

[@TGUlricksen]

Oobleck is the perfect example for both conditions.

[@laurenceo2340]

Great video

[@elewizard]

Glad you enjoyed it

[@Chemitronic]

I loved the demonstration of the voltage boost with a mechanical switch. It is amazing. Regarding inductors, theres is one application I find really useful yet, for me, has been difficult to understand: using them to limit the current. How does that work?

[@elewizard]

It is an awesome idea for a video. I am giving a clue here and I will demonstrate it completely in a separate video. Inductors are used for current limitation but an inrush current, not a constant current. However The main principle is demonstrated in this video

[@Chemitronic]

@@elewizard I see! Does that mean that you can use it for current limitation/regulation of a PWM signal? Does that make any sense? Thanks for your reply and your educational videos!

[@quixoticpj8577]

Thankyou ♥️

[@elewizard]

You’re welcome 😊

[@emil.honganmaki5461]

I personally use an npn transistor, but only a diode directly to the capacitor without resistance. and works well.

[@elewizard]

Awesome. By the way, there are many ways to get it done. Cheers 🍻 👏 ✌️

[@moriscnam]

آقا دمت گرم. عالی بود

[@elewizard]

Gorbanet ❤️

[@ronsykes5035]

So. There are. Two different critters headed in opposite directions with opposite spins. Each with their own capability and a combined capability. In a circuit😊

[@sauravp9215]

voltage we are getting is 81volts at the output but what was the voltage of capacitor used? surely must be more than 81 volts right?. could plz also tell how why 10micro farad?

[@RixtronixLAB]

Creative video, keep it up,thanks :)

[@elewizard]

Thank you for your encouragement. I will do my best 👌

[@etanmarcos2279]

Nice Sir I observe that inductor, transformers and capacitor are like the same function can you explain the difference.

[@ShopperPlug]

Great explanation. How does the transistor switch? It does it passively?

[@elewizard]

No, I've used my function generator

[@marcfruchtman9473]

@@elewizard ah...

[@soylentgreen9492]

Liked subbed and shared!

[@elewizard]

Welcome 🫡

[@jasonhines5754]

Good video. A small pause between sentences, or ideas, would make it easier to follow along when listening.

[@elewizard]

Thanks for the tip👍

[@zorabixun]

Very interesting 👌 ... I try to use element NE-555 to generate the oscillations, but I can't receive the rectangular chart, but it is like a dirty noise on the oscilloscope screen 🤔🤔 .. what can be the problem ? Thanks for you always very interesting, inspirational videos ✌

[@guytech7310]

I suspect your driving the inductor directly from the 555, You need a power transistor because a 555 Cannot source much current, the inductors circuit is drawing too much current from the 555 causing instability. You can use something like a 2N2222 NPN transistor (for a low power Buck boost circuit). if you want more power you need a power BJT or Mosfet. Mosfet will need a gate driver as the 555 isn't going to be able to provide enough power & probably voltage level to drive a Mosfet. better option is to buy a Buck Boost regulator from digikey, Mouser, Newark. Something like a MIC2172 Buck boost controller.

[@theodorekorehonen]

So basically a switch mode power supply without the AC input?

[@maikkempen6688]

Kind of, but one could also say that this is a DC-to-DC class of an SMPS. Since these implement the same concept as an AC SMPS (the switching part...). DC-DC converters are just as omnipresent in electronics as the AC-DC SMPS. I would rather compare this circuit to a DCDC boost (or "step-up") converter, but with a different placement of the inductor. The idea is the same though. A boost converter basically increases the voltage from the input to the output while decreasing current (conservation of energy...). You should look up boost converters if you're interested in power converters 😊. Boost converters, as well as buck converters, are used all over the place in electronics because of their relatively high efficiency compared to linear regulators. One of the downsides is the switching noise these switching converters generate. Especially if you're switching high power inputs.

[@elewizard]

Yes, somehow, but an SMPS has many other parts that are employed for some real world conditions and scenarios.

[@guytech7310]

SMPS convert AC into DC. All of the voltage input DC. Some SMPS will work from a DC input. It might not work if it has Syncronous rectifier or a PFC (Power factor Correction) on the AC side. AC SMPS AC to DC, DC to high frequency AC for voltage conversion, than rectification back to DC.

[@GameBacardi]

ouu, now I understand why old PC had negative voltage to motherboard from PSU. Or how negative voltage has made

[@guytech7310]

PC switching regulators use transformers, They have the ground center tap to create a negative voltage. Buck Boost (inductor) power circuits are rarely used as the are limited to how much power they can provide. The most common use for Buck converters is for voltage regulation (step down). Buck regulators are very common on modern motherboards to drop the voltage to the CPU voltage (usually 1.8VDC or less). They are placed very close to the CPU (Point of load) to avoid voltage drop losses in the traces. A big Server CPU might need up to a 100 AMPs at 1.2V (120Watts).

[@satsumagt5284]

⁠​⁠​⁠​⁠​⁠​⁠@@guytech7310No need for a server hardware these days, as even a Ryzen 7 5700X uses 120W under full load. Also the VRM’s can get a bit hot while pushing so many amps, which is precisely why they have a heatsink on nicer motherboards… So you can pair them with higher end CPUs. BTW, aren’t more modern PSUs also using step down converters for 5V and 3.3V, whilst the 12V is “straight out of the transforme? That’s how I imagine it works, but I have zero idea whether or not it’s the case.

[@guytech7310]

@@satsumagt5284 PSU use switch mode power system H-Bridge & a multiwinding transformer for different voltages. If you look at a pin out of an ATX connector it will have outputs for 3.3V, 5V, 12V & -12V. They use a transformer for better efficiency to drop down the Rectified AC voltage ~170VDC for US 120VAC. There could be some buck converters use for the lower voltages depending on regulation & power requirements. For instance there make be a 12V transformer Output feeding a Buck regulator to drop the voltage to 3.3V/5V. The motherboard will have buck converters near the CPU to provide ~1.8V power rails. These are usually very close to the CPU to avoid power losses since a CPU can draw around a 100Amps @ 1.8V 180Watts. for a CPU using about 120W it will draw around 67Amps. There might also be some lower voltage rails need at 1.5V or even 1.2V.

[@Marco-xz7rf]

you can use the inductor itself to trigger the transistort by adding a second winding, that uses the back emf to triger. Then you have a joulethief or re-emf. Dont't really understood the difference. Can use those to charge batteries. It's said to be able to charge dead batteries, because the high volt pulses somewhat help "shake" the batteries awake, it also should be able to charge the batterie "higher", like it will have the same voltage at the end, but it will have slightly more overall power, when doing a discharge test from full to empty. Maybe you could look into that and proof / debunk this? :D

[@y2ksw1]

Is the resistor really determining the output voltage? It's a long time I am into building inverters, but I always hesitated to build a transformer-less one. Now this is really interesting! I would then need a roughly 14 Ohms resistor to get the 330 Vpp I need to generate 230V from 24V ... ? It's more complex than that, but interestingly it's not overly complicated to translate this to a procedure a microcontroller can solve. I have already tried something, but with a different design. A coil in series and 2 MOSFETS to do the switching. But I didn't like the losses.

[@elewizard]

Yeah, the concept is the same but you need to make the output strong 🤗

[@y2ksw1]

@@elewizard That's no problem. With inverters, the input current easily reaches 120A at 24V, that part I have already solved a long time ago. But having a transformer-less inverter would be the next step I would like to reach, and now I have something to play with.

[@y2ksw1]

@@elewizard Is it true, that with a relatively small inductance and high frequency, I could transport more power? A small inductance saturates fast. Just reasoning... MOSFETS have a speed limit, but they can go up to 1 MHz. If I could build an inverter without transformer, I am more than happy to buy better transistors 🤗

[@destrierofdark_]

the best way to think about flowing electrons is like flowing water. a capacitor stores pressure, while an inductor stores volume. and, just like with water, an inductor will resist changes in flow much like a large volume of water in a pipe resists changes in flow by means of its own weight through volume.

[@Sir-Dexter]

nice

[@elewizard]

Very nice, cheers 🍻

[@gamingSlasher]

I clicked THIS thumbs up.

[@elewizard]

🫡

[@supremeleader5516]

Can I use esp8266 to generate frequency? I don't have generator

[@elewizard]

Yeah, there will be no problem 👍

[@raloed.363]

You know what I find weird about transformers. The equation that determine the voltage field in the secondary is dependent on the changing flux and number of turns. While the flux density is dependent on the current. So if I put 10V, 1A and 60Hz in a 1:2 transformer the output will be 20V, 0.5A at 60Hz. If you double the input voltage only to 20V the output voltage changes proportionally. However, the variables in the equations that determine the secondary voltage did not change. So how did the new voltage get transfered to the secondary?

[@UnifiedInfo]

Input voltage is another variable. Made my head hurt trying to make sense of that nonsense

[@raloed.363]

​@@UnifiedInfoit's not nonsense. I'm not talking about the basic transformer equation. Look at Maxwell third equation. The rate of change of magnetic flux is the same for the 10v and 20V primary input. But the induced electromotive force in the secondary is different for both scenarios. How is that?

[@UnifiedInfo]

@@raloed.363 one variable changed it was voltage

[@raloed.363]

​@@UnifiedInfoyes and how did this changed voltage got transferred into the secondary when the variable determining the voltage in the secondary is rate of change of magnetic flux. The rate of change of magnetic flux is the same in both scenarios because the rate of change of current is the same in both scenarios. I'm guessing the answer is in the fourth equation but the electric field is within the wire not outside the wire. So how did the secondary coil experience the change in voltage from 10 to 20 volts? Unless a wire carrying a current produces both an electric and magnetic field around it?

[@scamchan]

Now I can understand how car amps can ramp up voltage from a 12 volt supply.

[@elewizard]

Yes 👍

[@DynamicSun]

Relais, you must clear that loading with RC oder Diodes

[@ChandrashekarCN]

💖💖💖💖

[@elewizard]

❤️❤️❤️❤️

[@jozsiolah1435]

In a laptop the coil gives a buzzing sound only once during hibernation, and lasts for 1 second. It gives a signal to a satellite to start the maintanance of the laptop. In balanced mode, the laptop has to go trough some successful hibernations before this feature turns on. Some chips , eproms don't contain informations, they are downloaded from a satellite. One such is the battery balancing, allowing the cells to drain equally.

[@simpsonizer]

Ooh! I wonder now if there is enough current to make a neon indicator bulb glow

[@elewizard]

I don't think so Here we have a very low output current 🙃

[@galacticadv9247]

👍🙏

[@elewizard]

❤️❤️❤️

[@DrN007]

How useful is that voltage once it's connected to a load though?!

[@jj74qformerlyjailbreak3]

Have you ever seen the American show "Junkyard Wars"? I was thinking of getting a few YTer together for an episode of "Junk Board wars" I think it would be I nice series. What say you? Anyways. Lots of love across the waters.

[@jj74qformerlyjailbreak3]

Won't it be 120 v at 1.2 amp

[@MrKillerno1]

I would love to see an actual lightbulb being attached to the output and see if it holds the power also... But you electronic buffs will probably say: that's not possible.

[@elewizard]

That is not possible 😁

[@2pist]

Phenominal explanation! Question, i built a switching supply using a Ir2153 half bridge. It draws too much current as I made my transformer with low primary winding count. Can I reduce the current by increasing the frequency? Or at least the load on the FEts?

[@elewizard]

Sorry, It depends on many things so I can't give advices here.❤️

[@greggorr314]

Waiting for that electrolytic to go boom with all the charge being dumped from the inductor. Or the [flyback] diode to break down.

[@elewizard]

It is a ceramic capacitor 🙃

[@greggorr314]

​@elewizard what I was looking at must have been the inductor.

[@walsakaluk1584]

​@@elewizardceramic capacitors also contain trapped smoke.

[@DazfxDenz]

It must be obvious to everyone else because I don't see anyone asking, why did you use a PNP and not an NPN transistor?

[@elewizard]

Because I have a dedicated video on this subject in the channel 😀

[@sachinpandey8488]

Please make how to reduce voltage from high to low

[@elewizard]

Principles are the same 👍

[@transformateur9969]

❤

[@elewizard]

❤️❤️❤️

[@tvbox8478]

👍

[@elewizard]

👍👍👍

[@ampere-mam]

This is quite easy to do with a modified relay switch entirely mechanical

[@elewizard]

Thank you for sharing 👍

[@mikejones-vd3fg]

Youre not just human you're a beast! Press harder! Faster! Moar voltage!! Jk. Thanks for the useful circuit to check the power of the inductor, I don't have an LCR meter, but do have a cheap handheld scope I hear you can use to find the henries. But I guess you can just out it in a circuit and find out.

[@ericpilboue3276]

You can use signal generator, the self in serie with a resistor, so, the voltage repartition is like a voltage divider, the simple one like in dc and L*6.28*f in hz. Hard to explain in english but sure you find several methods on the web

[@luka7001]

why only 1kohm, can you place 10 times larger resistor and get 10 times larger output? Otherwise great video, you got 1 more subscribe

[@willyouwright]

What I don't get. Is if inductors inhibit voltage spikes how come when they discharge you get massive voltage spikes?? And fast!!

[@wb7ond]

DC applied to an inductor is not "felt" instantaneously, initially no current flows because the expanding magnetic field (cutting the turns of the inductor) is creating a voltage opposite the applied voltage. Therefore no current flows during those first "nanoseconds". When the field stops expanding, (DCV reaches max stable value) the opposing voltage stops (expanding field stops) and the current is only limited by the series resistor and the wire resistance. That field is now max'd out as long as the DC is applied. Kinda like pulling up a weight on a pulley and holding it there. When the DC voltage is removed, that max'd out field collapses around the windings of the inductor and tries to keep the current flowing, hence the big spark. Remember the old "condenser" across the coil of the old Kettering ignitions, that was to keep the points from pitting from the arcing... When that DC voltage is suddenly removed, its similar to releasing the weight that will come crashing down. When you apply an ac voltage, the expanding and contracting field "Try" to keep up with the positive and negative variations, but it can't so there is an "impedance" to the applied ac.

[@sarkisbarkil867]

great

[@elewizard]

Thank you so much ❤️

[@supremeleader5516]

Pls make volume high

[@elewizard]

Ok

[@paulwright8378]

Is that how those welders increase amps by pushing a iron rod through a copper coil without changing the voltage

[@elewizard]

Dipping an iron rod into a coil just increases the coil's inductance. But I have no idea what it can do in a welding machine 👍

[@powerpointelectrical5424]

I am totally confused how you can connect inductors in parallel with a battery

[@elewizard]

It is not parallel, there is a resistor in between

[@h2opower]

Why didn't you show the equation for this so that folks could learn just what is going on?