Basic Electricity - Resistance and Ohm's law

[@billigerfusel]

That feel when you're an electrical engineer already and still watch Afrotechmods, because he makes good videos.

[@FunScientifix]

billigerfusel right in the feels 💛

[@LexyGamesLB]

Same

[@spacy50]

billigerfusel

[@bettymaevilla9893]

I want to be an electical engineer too. ❤

[@Joe-bu9ei]

Same here, i'm near retirement after spending 41 years in electronics trade. Why am i watching this video? Good video for youngsters to learn from. Please stick to battery power until you know what you are doing. Stay safe. @billigerfusel

[@bobsmithy3103]

I love how you show real world examples and all the sparks and fires. It makes it a lot more engaging especially so when you know the consequences of doing something wrong has very real potentially dangerous outcomes.

[@origummy_]

Your videos are Awesome! It took me 2 years to fully understand all of these things myself, if I would have found this channel beforehand it would have taken 2 days. I hope your videos get to as many enthusiasts as possible! Thank You!

[@leonardfibigerlewis]

Sir... don't ever die, please! You are the best teacher I've ever had, and we're not even face-to-face! Your content hits the zen spot for understanding something that used to seem like an off-world language to me. With the deepest respect I can muster, I thank you. Leo.

[@nadiyahserrano8827]

it's videos like these that make me second guess why I'm in college learning this stuff when amazing people like you explain it so much more thoroughly than any of my professors ever could, and it 's their JOB.

[@XanthiumIndustries]

we have a youtube channel that deals with Arduino,ATmega328P,Java,Serial programming ,robotics. So if you like these stuff do Subscribe. Sorry for annoying

[@iggzistentialism8458]

"bad conductor, like this... er...dried out piece of carrot" has to be the most unusual choice of poor conductor to-hand I've seen, lol. Brilliant video. You have really helped my son learn the basics of electricity today, thanks for making these basic vids along with all your other awesome vids.

[@fergusoddjob]

Afrotechmods you are an amazing teacher, these videos always clear stuff in my head despite doing electronics for so long your understanding of the topic is very very impressive.

[@AshokDewan]

God bless you man. Please keep up this good work. I am from infosec. I wanted to learn about electricity. I always learn anything by visualizing and by imaginating it. So, your animated videos are very useful for visualization in mind. Thank you so much

[@kirillvishnevsky6327]

Ashok Dewan Waaaait a second. I am from infosec too and I want to learn about electricity😑

[@tedspens]

62 and just now learning about electronics. I might have found interest years ago if somebody would have explained it the way you do. Subscribed and gonna check out some more videos. Thanks!

[@greatscottlab]

Great video!

[@ArsyadKamili]

Woah, you're actually here. Just to let you know, I love it when you explain a 'somewhat complex' circuit using your Keysight. And when you start taking notes and do calculations, that's when I feel somewhat advanced and professional. XD Love your vids, thanks.

[@himanshu9559]

GreatScott! You too do great job

[@louisciamillo8690]

Hey scott! I love your videos!

[@FunScientifix]

wohooo. hiii

[@lvb1b463]

Great Scott!!

[@IoanaC.]

At 0:22 - 0:23 you can watch the little LED's soul being lifted to LED heaven

[@renae9450]

this comment made me cry an LED tear..

[@epiendless1128]

0:24 "I'm not dead." 0:26 "You soon will be." 0:27 "He's died."

[@rudolphguarnacci197]

Poor LED was sentenced to the electric chair

[@someguyontheinternet-]

Bwahahahahaha!!!

[@princey_06]

Idaho Made bmwahahah

[@RDYS]

Nice videos, all of them. As a field service engineer for 30 years (retired now) I'll use your videos for examples to my kids. Well done.

[@relativenormality]

another great video from one of the best electronics channels on youtube. more please - happy to sit through adverts for your content!

[@VitaminB88]

⁷

[@dmatthews7423]

Thanks for actually showing what happens when you run too much current thru an led, instead of just saying 'something bad will happen' or 'you don't want to do that' like the other videos!

[@Simonjose7258]

Wow! This is totally electronics for dummies. Thank You! This is what I need.

[@boltmann]

I wish this guy still makes electronics videos. He's actually one of the best.

[@paulglad5615]

Great video! The extra detail you put in describing how it works helps a lot. Examples both written and in performed in real world are excellent. More examples the better! I've watched multiple videos on resistors but I learned the most from yours. Looking forward to more videos.

[@jollyscaria1922]

The ratio 0f r.ms value the average value of an alternating quantiy is called frim factor .. Rms .value /average value 1m£2 /=€\21M2€m=1.11.

[@pastaman64]

I've only watched this video and your LED video, and so far these two videos made by presumably one guy has taught me infinitely more about electronics than several lessons at school ever did. And this was a lot more fun than those lessons too.

[@Mindful2222]

afrotechmods, your videos are superb, waiting for the next one!

[@jacksonwhiteley]

I really appreciate all the detail in your videos and when theirs a lack of detail you refer us to an explanation in another one of your videos. Electronics is my biggest engineering weakness and so what better thing to do then to learn it, and with your help I can. Thanks -Jackson

[@castigohd]

explosion at 5:53 made me jump from my chair 😂 for some reason I was concentrated on something on the screen and when the explosion happened, it made me jump

[@castigohd]

@Badr Ahmed headphones actually... yes

[@pinballplayer]

that poor Raspberry Pi...

[@rogerking7258]

Just found this channel. You must be a teacher because the clarity of your presentation is streets ahead of most people's. Unfortunately, I came upon this after two years of trial and error getting my grandchildren's train set and trains illuminated; at least I have ended up with roughly the same resistor values as the maths suggest. Next time, I'm armed with the correct information to bypass the trial and error. Many thanks.

[@himanshu9559]

The best tutorial about electronics on KZbin Great Job👍👍👍👍👍👍

[@ncedwards1234]

3:50 has done a much better explanation than anything anyone else has ever told me.

[@kagazki7026]

Oh my God! Thanks so much for that comic! Everything makes sense now.

[@traktorworks3200]

in my teem years i attended an college electronics course but had a lot of trouble following the lecturers teaching. how i wish we then had ut where i could have learnt a lot more that what i was able to learn from the college lecturer. this presenter is many many time a better presenter than the then lecturer ever was.

[@Afrotechmods]

Yup. That's why I made these videos!

[@makerKID5]

Why am I buying resistors when I can just use a dried out piece of carrot?

[@ArsyadKamili]

Sir, you've made my day.

[@superdau]

I don't know about you, bu I always had problems tinning the ends of the carrot. That's why I started using resistors.

[@tablatronix]

A new unit of resistance? The impedance of this circuit is 3 dried out pieces of carrot.

[@makerKID5]

tablatronix 😂

[@TheOswald42]

ys, you can add it or slowly sandpaper it to desired resistance

[@md.mohiulislam6516]

i see around 15+ video but i didn’t understand. this video clear all misconception.specialy mathematical part is very helpful. thanks a lot.❤❤

[@richard1113]

In your simple circuit with a 9V battery, LED, and resistor @5:58 I see the resistor on the anode side. I've seen this before and know it works but never understood why. Can you explain? If electrons flow from negative to positive I would think that this location is "too late" to save the LED. Wouldn't it be more appropriate to have the resistor on the cathode side?

[@runeklok]

In this case it does not matter which side the resistor is located in the circuit, so long as it is present. The omitted part of the video does not detail the fact that the entire circuit is in so called "series," meaning that every component is tied end to end with each other. In this format, the current is determined by the circuit voltage divided by the entire circuit's total resistance. The cool part of this setup is that the resistor and LED will both experience the same constant current in amps while having different voltages, since the individual component voltage is current times resistance. The only concern of resistor placement would be if the circuit was so called "series-parallel" where a drop in voltage could cause power problems in other branches of the circuit. Another concern on resistor placement would be purely for safety concerns if you wanted to limit a particular side of the circuit's current that might be exposed to human interaction, say a light switch.

[@dontbetonit813]

Richard Forester Seriously don't do anything with electricity take up macrame .

[@harveysmith100]

You are correct in your thinking but it will resist the flow in the entire length of the circuit, from battery back to the battery.

[@rli1618]

In this case (since the circuit is in series), the current at any point is the same as the current at another point. What dictates current is the overall resistance. Resistors don't "use up" current in order to save the LED, but instead limits it overall.

[@____Alan____]

I've likewise been thinking about this issue recently and am still confused about it...Glad Harvey and Ryan chimed in with their answers. Not sure why that apparent aspect isn't proactively noted more often when explaining this subject. I.e., the fact that a resistor (at least in a series rather than parallel circuit) will effectively decrease the current of the entire circuit (rather than simply a locality of it proximal to their placement). Because it seems (I would think) an obvious question for curious electronics newbies like myself. So yeah, I can defintely see the overall decrease in flow of electrons meaning lower current level the LED will be exposed to...BUT, is the voltage level the LED will be exposed to identically effected by the resistor (or is it, on the other hand, comparatively more dependent on location in the circuit relative to the resistor - i.e., whether it precedes or follows the resistor in the direction of electron [not conventional] flow)?

[@brianjordison2910]

You need to be cloned……I’m an electrician……its so nice to listen to someone who can explain electricity so clearly

[@Afrotechmods]

lol aww thanks

[@luvinscb]

came here because my physics teacher can't explain well- 👁👄👁

[@awizardalso]

I have an electronics shop in my basement. I have a Tenma 40 MHz oscilloscope with two inputs. I also have a Tenma Universal Test Center with a multimeter, a power supply with a 5 volt, a 13,8 volt and variable 0 to 30 volt, a signal generator up to 2 Mhz and selection of sine wave, square wave and triangle wave, and a frequency counter. I use the variable voltage to calculate the resistance of an LED when it gets bright enough and the current flow. This gives me what I need to know to add a resistor for the LED in a 12 volt circuit. I also design circuits for my model railroad signal system.

[@octavio.august]

muy bueno el vídeo, me vino bien toda la información!! saludos de Argentina

[@EmmanuelGitgud]

man, i am an information technology student. I mainly work on softwares, but arduino got me into electrical engineering which is awesome

[@crumplingguyvseverything8320]

My friend told me how electricity is measured and I was like Watt!

[@mudkip9531]

What is seen cannot be unseen...

[@muhammadsufian117]

electricity is amportant

[@KennethNicholson1972]

Ohmy God!

[@mmk7432]

NERD JOKES!!

[@samzwygart9097]

Those jokes make me Hertz!

[@vincentnoche8644]

finally a video about LED's that I can understand. thanks bro

[@Afrotechmods]

Interested in learning about wireless power? Subscribers can get up to 80% off my course Wireless Power to the People - Wireless Charging 101 on udemy using the coupon code "KZbin" www.udemy.com/wireless-power-to-the-people-wireless-charging-101/?couponCode=KZbin

[@mayankgaming5214]

best explanation about resistance i understod by seeing this video with experiment and by knowing about wich colour have what amount it i really a great video

[@silasfatchett5693]

V ---------- I x R Cover the quantity that you want to calculate with your finger, and you see the expression you need.

[@silasfatchett5693]

Or you would, if the editor hadn't removed the spaces before the 'V'.

[@redeye118]

@2:40 , I like how out of everything in the world that could be used a dry carrot was chosen 😂 definitely had me LOLin

[@38823202]

Thank you for this video! I have a pretty basic question here-- I see you followed your conventional current flow diagram when wiring up the 9v/LED/resistor. Why did you not wire it up according to neg to pos electron flow? If the electrons flow from the anode and hit the LED before the resistor, how is the resistor doing its job? It seems as if the resistor would serve no purpose after the high current flow already the LED. What am I not understanding correctly?

[@seanlikestoeat]

I have the same question! Someone please answer!

[@Lemonade6969]

@@seanlikestoeat lost all hope, 4 years and still no answer

[@budgiefish]

Think about the current flow in a circuit as a whole - where does the current go OUT of the led in that case? If you connect one leg of the LED to a high current source like a 12v car battery, but leave the other leg disconnected, what happens?

[@sollinw]

Thank you! :) My professor spend long time rambling out words that to me give no sense, but now I understand much better!

[@jerdumz]

This video explained well than my electrical subject professor whom I paid a lot. life sucks

[@thermosinthesis]

Dude you literally just saved me my IGCSEs are in a day and this came out today

[@rudolphguarnacci197]

Hope you passed

[@olddirtbikerider]

That's revolting! you never know watt to expect! Don't resist the temptation to laugh every now and then, that's the most current joke I know. Great video. Thanks for sharing with us dummies.....

[@SreenikethanI]

I am really amped up when I hear/see puns

[@username0004]

@@sushmaverma3562 no u

[@sushmaverma3562]

@@username0004 oh fuck

[@chrisdaniels3929]

Ohm y

[@nourhannoura668]

The fact that I 'm here just for my physics lesson...😂😅 I didn't expect i'll learn how to become an electric engineer

[@idjles]

One of the most important things about LEDs are that they are low power. You put the LED in series with a 300Ω resistor. This meant that the LED was getting only 33% of the power and 66% was wasted in the resistor. With the 140V you toasted the resistor with 2.74 W as it got 98% of the 2.8 W of power leaving the battery - only 2% was used in the LED. How do you actually use LEDs without wasting power into resistors? Even LED strips you buy on Amazon have resistors. How do we use energy-saving LEDs without wasting energy in resistors?

[@Afrotechmods]

Constant current buck converters

[@idjles]

Which means I shouldn't be using LED strips if I want more than 30% of the energy to go into the LEDS. I don't see how I can connect a constant current buck converter to 16 feet of www.amazon.com/LEDwholesalers-Flexible-300xSMD3528-Adhesive-2026WH/dp/B002Q8V8DM

[@mediaguardian]

Why limit that question to resistors? Many discrete components have limits on how much current they can handle. So one simply uses the appropriate resistor. An LED is no different.

[@ethanmye-rs]

Basically, you have a chain of LEDs in series and a small sense resistor at the end, (0.1ohm or so). You know elements in series must have the same current going through them, as part of KCL. You also know that in a resistor, current is directly related to voltage, and more importantly, linearly. What you do is measure the corresponding voltage across a resistor to read the current through the LEDs, then use that as feedback in your buck/boost driver. It's more complicated that that, but that's the gist of it.

[@superdau]

+Idjles Erle With LED strips you don't waste 66% in the resistor. Have you ever tried measuring the voltage drop in those resistors? It's typically 2 out of the 12V you run the strip at, so 16% loss in the resistor, which is actually a better efficiency than many of the cheap constant current drivers (for low currents). You can't use a constant current driver for a strip. Such a driver can only drive a single series connection of LEDs, parallel connected ones (exceptions if you know what you're doing), which for a long strip would mean dangerously high voltages.

[@kestonmendez4290]

Great job sir! Awesome work.. I think you should do all the videos on KZbin period. Well done! I was just fooling around and wasting time watching videos and I was very happy. Do more vid's..

[@NikNik-bg7ex]

3:49 current abuse 😢

[@raiyu1985]

Thank God I found this channel.

[@FastusMusic]

question: so could I also place the resistor BEFORE the LED then, instead of after as you have here? seems if actual current is flowing from neg to pos, I'd want it to traverse the resistor first... or is the placement of the resistor unimportant because it affects the circuit as a whole?

[@TealJosh]

Well, here's the thing. Voltage and current flow are about voltage differential. You have to imagine that there's someone pushing the electrons at the negative side, but there's also someone pulling them on the positive. No matter what side the resistor is on, the current will flow just the same through the led.

[@muwaffaq27]

im 70 and I start doing Arduino following you videos

[@raymunds]

If electrons actually flow from negative to positive, could you have placed the resistor in series with the cathode side of the LED and achieved the same function?

[@lekshmyarun4127]

Actually electrons flow opposite to the flow of negative charge....

[@MrPorrohman]

You are the best! You earn Millions of subscribers!

[@aerickajm9298]

3:52 *crowd cheers* 3:57 *crowd boos*

[@BrothrBob]

I took notes & saved it to Microsoft Word, It was very helpful when I setup my LEDS for my R/C vehicles.

[@JimGriffOne]

08:30 - 2.74W dissipated from a 0.25W resistor. Magic smoke released. Very hot electronics porn!

[@lvb1b463]

Porn?

[@JoshWeaverRC]

LVB1B. You rather someone shit on your chest?

[@alanc6781]

I have just found this video. Thanks. I will watch it again when I get ohm.

[@evansymonds5400]

Even my leds blowing up are less exciting than yours.

[@billmarkelz]

This topic never gets old. Subbed

[@gurjeetkaur2973]

Did anyone else almost jump at 5:47 - 5:55?

[@yourviralvideo2169]

no

[@petermorthen]

What great videos....makes the most confusing topics, easy to understand. Thanks.

[@Flankymanga]

Uhhh that raspberry was a expensive test....

[@colepeterson5392]

not really

[@thehastyminer5467]

That's the entire point of the PI, to learn, and breaking it is a form of learning.

[@ApostolicCherub]

My 5 year old daughter just watched the movie earth to echo. She wanted to have a toy echo doll. Echo has two blue eyes. Simple, when I go to wire up the 2 blue LED for the eyes to make her Echo toy, I now know how to wire it up safely. Great video! I took some notes for later project use!

[@Afrotechmods]

Yay! Next step: Teach her how to do it!

[@voneschenbachmusic]

Poor Raspberry Pi...

[@queenjoy7217]

I thought the same

[@Houkie]

I love elektrotechniek and elektronica. good video! resistor is warmth, fasecutting...

[@ryan624]

I need a resistor for my head it's getting fryed

[@jenycek2222]

i calculated it for myself and it was 69,42 petaohms

[@martintownsley6544]

I used to have a Electronic project box from Radio Shack with 300 or more projects and I learned a lot about circuits, radios, etc, etc. But now that Radio Shack is closed, can you tell me how to get one? Thank you very much for these videos.

[@SigEpBlue]

Resistor calculator? C'mon, son. Learn the mnemonic like the rest of us did back in the day. ;)

[@Afrotechmods]

i r 2 stewpid 4 dat

[@trashunlimited]

electrodroid ftw xd

[@peshozmiata]

"I had to suffer and you should too!" :D

[@Nerdthagoras]

Hey, we can use those resistor things to make a machine to remember for us ;)

[@michaelshultz2540]

Bad Boys rape our young girls but Violet gives willingly. Get some now.

[@h.d3496]

I love how you just made everything simple by using a dried out carrot 😋. Who knew they were such good resistors?

[@s.m.tuitions6416]

kzbin.info/www/bejne/r4GcfKiXqNulj68

[@toxicore1190]

in Germany we use U instead of V

[@3rdpartyU5er]

Same in Finland.

[@appelnonsurtaxe]

Same in France

[@raymondj8768]

you guys just trying to be different hahahaha

[@akshays8655]

???..a doubt from India

[@umajhingharan1934]

this vedio cleared all my concepts feeling that i have acquired extreme knowledge i m very thankful to you 👏👏👏👌👌👌

[@rameshkadam1172]

Reactor desind vedeo

[@SuperVstech]

Everyone knows about resistance. It’s futile.

[@whoahanant]

Complete newb here actually taking notes like this is a school lecture. 🤣 So helpful!

[@roycai8895]

Children in africa could have ate that Raspberry Pi.

[@ArsyadKamili]

Raspi in Africa could've eaten that children.

[@Afrotechmods]

Toto ate my raspberries.

[@ArsyadKamili]

+Afrotechmods It seems like Mr. Afro is in a good joking mood today XD

[@tania2654]

Very nice... I wish if I could have u in my Electronics Engineering time and in my Electronics Lab. Now I am an eng but still I watch ur videos.Your lectures are awesome.

[@MrHD71]

What if i put 100 leds in parallel do i need a resistor?

[@tommyallehamn]

NE555 yes of course u need!

[@qaz010wsx]

you are connecting them in parallel to a voltage source so it is the same thing as connecting one. If you connect them to a current source then also its not a good idea as leds don't do current sharing very well. One will take a lot of current first and blow up, then next will do the same and soon you will have 100 burnt leds on your hand.

[@tommyallehamn]

+Qaz Wsx it depends on if u wanna use just one single resistor for the whole LEDs or a single resistor foe every LEDs. I think his question was if he would use just one single resistor!

[@renzevenir4853]

You need a Power MOSFET first to control big loads with microcontroller

[@superdau]

No, you don't need one, you need one hundred. Unless the LEDs are matched (i. e. have the exact same electrical properties, which is improbable unless you measured them all) and thermally coupled (all stay at the same temperature by mounting them on the same heatsink for example), you must never connect LEDs in parallel without a resistor for each parallel string.

[@rodrigopelaez1]

hi, im very new to all this, i have a stupid question, if the red wire is the positive and the black is the negative, and the anode of the LED is the negative and the catode is the positive, why is the red wire (positive) connected to the anode (negative) and viceversa? or what am i missing?

[@drypiranhaplant3033]

Ur missing a lot of things

[@simondesu1]

Great explanations. Thank you taking the time to make these tutorials 👍😊

[@Afrotechmods]

My pleasure!

[@dopaminedriven874]

Very well put together video. Cheers

[@doodoofarter105]

hey ! just found this awesome video , was finding a video that could thoroughly explain electronics to me, and i think i would stick to this channel !

[@XanthiumIndustries]

we have a youtube channel that deals with Arduino,ATmega328P,Java,Serial programming ,robotics. So if you like these stuff do Subscribe. Sorry for annoying

[@cabdulaahigaabow8466]

Electricity engineering is very beautiful to study and imagined. Electricity is very smart and connected one.

[@cathyny83]

This video is a gems and is really well explained about the eletricity current. Thank you so much!

[@ahmedsspharm2004]

Wonderful illustration

[@amalas1212]

Thanks from Jordan 🇯🇴 ❤️❤️

[@kavindugilshan]

Every electronics beginner should watch your videos ... !! Thank you Sir !! Waiting for the next video ....

[@markmcewen3959]

Well done. Thank you for your concise explanations.

[@kwissiekwissie]

WOW!!! PLAIN and SIMPLE. good video!!! #TheBest!!!

[@DevProdigy]

Oh man you're back!!!! NICE!!!!

[@CarlosOrtiz-ht6rn]

Very polished and informative video. Subscribed

[@atombatumbakaljr.4174]

Very informative....how I wish you were my prof in Electronics before.

[@JohnWayne99999a]

Love the way you explain things. Very useful

[@youthuber13]

Nice video, watching here in Canada full support here watching

[@biyomjaiswar_]

Very informative video Thank you ☺

[@NIGHTOWL-jf9zt]

3:45 explaining to your wife why her wedding dress doesn't fit anymore! This looks like some weird position of Kama Sutra. This is literally an image I can joke about all day but the fact is, This actually taught me something useful. Thank You for this video!!

[@gogo9273]

You really are a genius thank you ❤❤❤❤❤❤❤❤❤❤

[@AshcraftFraming]

Great video, all are great in fact. I'm just starting out with electronics and your videos explain things by well. Thanks. Subscribed.

[@muniraj8873]

Your description is awesome

[@freddyfriesen]

Two thumbs up from the retired teacher of electronics.

[@sarathraj6194]

keep doing a videos. its very useful for basic learners..