Resistors in parallel | Circuits | Physics | Khan Academy

[@yazicib1]

Many thanks Salman.... I am a veteran software engineer trying to re-learn electronics for my robotics hobby and your courses are helping a lot to refresh my memory... You are doing awesome teaching job, please keep up the excellent work, and don't let your popularity stray you into politics or some other evil thing :) Peace! Baris

[@ClapBoomBoom]

I can't concentrate on the video because I couldn't stop thinking about printer burps lmao

[@Tristen_Smith]

ClapBoomBoom I couldn’t concentrate due to all the high quality free porn that’s available

[@junkim2837]

Jesus. . . 22years of my life. Finally electric circuits starts to make sense to me. This way of learning is way more efficient and visual than just reading textbooks

[@violenceislife1987]

14 yrs for me. Thanks Mr Kahn!

[@imrannazari8642]

Fr

[@MsNatalieRose1]

I'm using this to study for the MCAT actually!

[@syxn_14]

@PRANAV TIWARY padhle bhaii

[@fujiwaraofmokou]

How did it go

[@brettfriedman8322]

0:32 - printer burps!

[@claremengebier6197]

noice

[@SeanStephensen]

Brett Friedman nice

[@michaelcloete8919]

Thank you so much like on another level, there are concepts that you help me grasp so readily while my high school teachers only feed me formulas and expect me to know what's happening, a special thanks to your explanation of volts in another video where you explained it using the work needed to move a certain charge, this was an absolute break through for me and makes me almost excited for my up coming physics exam

[@SocksKr]

I have a feeling that comments like yours are the reason he keeps working on these videos.. Thank you for being awesome :)

[@greenscreenasshole]

Wassup noe

[@commanderkool868]

Thank you so much Sal. I'm in a youth program at a college and we have a quiz on this circuit stuff tomorrow, but I haven't taken physics yet and I felt so lost. After watching these first three videos I feel like I am beyond prepared for the quiz. Thank you again

[@tasnimul0096]

How are you doing now

[@angrinord]

I just published printer burps on urban dictionary.

[@pintudey406]

Oh my god! 8 years ago😱

[@ivoryas1696]

@angrinord Based?

[@Pereza0]

Thanks a lot for this, I was struggling with the concept of potential and the way capacitors/resistance affected it. Its all soo clear now

[@findvoltage]

i realy blew a fuse when you changed to magenta.

[@brentwoodbc]

right when Im about to go "wait what about...." he answer my question haha awesome thanks.

[@zebdor44]

Dude, your videos are a gold mine! Thank you so much. Your videos are really easy to learn from and are very interesting. Keep up the excellent work!

[@Vinodkumar-ej5yg]

Where r u now

[@cursedswordsman]

I FINALLY UNDERSTAND THIS

[@StiegeNZ]

Heya, I think a good word to describe the flow of current in the conventional direction is to express it as electrons jumping through free spaces between atoms, and conventional current as being the flow of 'holes' or 'gaps'. Thanks heaps for your work, you're going to get me through an Electrical Engineering Degree over the next 4 years.

[@saqlainmohammed6616]

This helps me alot. thankyou salman khan.

[@13DarkCookie13]

Thanks so much! I finally understand why the voltage across each component in parallel is the same!!

[@Leonimy]

thankyou dude. So helpful!!

[@TalkAsSoftAsChalk]

More like Best Teacher In the World!!!

[@iamanubertuber]

I know this is really off topic, but you always speak of "intuition" in your videos, which is a topic i am interested about. I'd be very interested in knowing what your understanding of intuition is and its relation to other forms of understanding. I'm going to go ahead and request a video about it too.

[@seasnek7024]

thx for the video man, really helps me move through physics class

[@Armarcoarmagedon12]

Electrons trying to reach the positive side of life? Still a better love story than Twilight.

[@MisterJamesEdward]

Thank you Khan Academy!!! These circuit videos helped clarify things.

[@orbsandtea]

Tjihihihihi... "Printer burps"... Tjihihi! Best part of the video! The other stuff was cool too!

[@AbdulWadood-ou3qb]

dear teacher I think conventions are made just for our comforts and they are not superior from reality if you can please live this routed conventions

[@balaganapathy6869]

sal so u saying that motion of electrons is in direction against current .....??

[@amadohc]

seriously, the circuit at 8:00 is the most beautiful circuit i have ever seen

[@victoriawu6551]

Thank you! So many lectures but I couldn't grasp the idea of potential difference until I watched this. Eye opening.

[@annetomori4919]

Wow. He just cleared up a lot

[@1486345]

I noticed someone had a question about the math he did at 9:06 so here's the explanation: When he did 1/20 + 1/5 and came up with 1+4 over 20 all he did was convert 1/5 to 4/20 in his head. This leads to 1/20 + 4/20 or 1+4 over 20 which leads to 5/20 or 1/4.

[@Michael-ur4gd]

I don't know how people are having trouble it's the simplest mathematics really and he even said what he was doing

[@gusisthebest25]

Where did he get the 1? If it's V/R the V should be 16 not 1

[@Schniminem]

You have to have an equal denominator. In this case he has the 1/20 + 1/5. To get the equal denominator you need to multiply (1/5)*4. That gives you 1/20 + 4/20 (pun not intended), this equals to 5/20, which equals to 1/4. This leaves us with 1/R = 1/4. To get R: (1/R)^-1=(1/4)^-1 leaves us with R =4

[@SaifurSharif]

Comfortable explaining.Thank you sir.

[@htmlfreak]

thanks for the vid!

[@megamusic49]

This helped me in science! Thanks Sal.

[@OoxLOVExoO]

i love you. i got into med school but now i have to pass these entry exams in physics chemistry and math. If i do pass, it'll be all thanks to you. wish me luck!

[@TheBoaConstrictor95]

Thank you so much! My physics teacher has been explaining this for about a month now & I finally understand :D :D :D

[@ScottieHProductions]

Thank you so much! I think I can pass physics now! :D

[@Tyoson123]

The good thing about these videos is when I realise my short attention span has drifted off, I can rewind the video and go back to where I was. You can't do that in a classroom.

[@FLAMERNECRO]

THANK YOU !, never understood how v/r + v/r is 1/r + 1/r, AWESOME!

[@jessefreeman3923]

I am still trying to understand how did he get a one as a correlation or equal to voltage, I get that it doesn't change but how does that make it 1

[@kyomo2667]

Okay, I finally understand formula for resistors in parallel, thank you!

[@zanysazy]

i love you I find the textbook so hard to decipher you make it all so simple

[@devigopalakrishnan2909]

Loved the squiggly circuit!!!🤩🤩🤩😍😍😍

[@apaaja2672]

Thanks for the video

[@PeaceLoveFairytales]

thanks for making physics intersting...

[@yazicib1]

@rinwhr Due to conservation laws (Kirchoff's law), the current flows in a series circuit has to be the same in all points of the circuit. Since current is basically rate of change of charge per time, it is basically the speed of electron flow. So by this definition if there is a resistor in a circuit, all electrons that are coming into it and out of it will have to slow down so that kirchoff law holds. This is only possible if there is a voltage drop across the resistor. And this is the case.

[@profssrfunk]

is the voltage drop different between the resistors in parallel?

[@andrewxu3602]

No, they're the same.

[@dhanavathygRaja]

Please l don't understand that part can someone help me get it right

[@mufasathelion5153]

2:56. does he mean I3?

[@hanibarnieh2789]

HAHAHAHA this dude probs finished college by now

[@paulkta8635]

@@hanibarnieh2789 YEP

[@thundere752]

@King David 😂😂

[@Sanchitoooo]

he seems like hes ina good mood in this video.. it reflects on his audience :D

[@yazicib1]

@mexman48 Negative charge means, there are more electrons on that side of the circuit by definition as the electrons themselves are negative charged particles. So they are simply trying to move from the point they exist a lot to they exist less. This is a spontaneous process possibly due to entropy and has to obey the laws of thermodynamics. Just like a rock falls to the ground but doesn't spontaneously fly.Flying means increasing potential energy and that is not possible in a closed system.

[@Demolishion1994]

Mind Blown!!!

[@astrocreep51]

New color will be MAGENTA!

[@fleshcookie]

Hey Sal, which direction are the electrons actually flowing? lol

[@jeffa2842]

can you add switches? That would be awsome... good vid!

[@martynmart8691]

I didn't quite get why the voltage drops with 16 V in this one "arm" (10:50). The voltage is 16 V and this is the sum of all the voltage- drops in each arm. So the voltage in one arm should be V1 = 16V - V2 shouldn't it? Or is this special to this problem with parallel resistors? I feel like I didn't quite get the thing with voltage. Voltage is the potential. When charge/ electrons are in a resistor, they basically give away energy. By impulse, friction, whatever. The potential gets lower but there still has to be some since the electrons eventually reach the + pole. Right? I see that the current drops and the resistance increases, but why exactly is it 60 volt? Why isn't it 30 since the voltage is the sum of the voltage in each arm?

[@FerretDude41]

you are a good person

[@kita9620]

I love your little humours man haha

[@yazicib1]

@dalcde Appliances are AC devices usually. The fuse is put on non-ground side of the appliance. Ground is basically a wire connected to the earth (largest sphere we can think of) The other wire (non-ground I guess, I am not sure what it is actually called) is the actual wire that carries alternative current. Flow of electrons in AC is constantly changing in a sinusodial wave from one direction to other. And this is 60Hz in US, and 50Hz in Europe, etc. I am sure Salman has another video on AC

[@gsilva-s8c]

Hi Sir, great serie of circuit videos. Keep it up!

[@Vinodkumar-ej5yg]

Where r u now my man

[@bosslovely27]

Thanks so much Mr khan

[@imrannazari8642]

thx sir you are a life saver

[@RainbowPaint]

Thanks Khan your awesome!

[@spaff61]

thank you for posting this

[@the3king3lion]

It is really weird to watch this then know it was published more than 8 years ago... anyway thanks so muck Khan Academy and the one who made the video.. appreciated.

[@dukeisaac]

hi sir can i ask a question??? i was so confuse about what is the flow of electrons.. is it from negative to positive ? or positive to negative?

[@hassanhamze_14]

Electrons flow from negative to positive

[@reezis1619]

4:44 doesn't he mean potential difference instead of voltage difference? Voltage IS a difference in potential

[@mitch1870]

By now you are done with your test or exam but yes he means potential difference

[@TGODstayhood]

Thank you very much man your videos are very much appreciated

[@MosomeStingVT]

@ 3:10 when you write the equation for the total current, i'm confused. i was wondering why its not I1=I2+I3?

[@uPB4uTube]

when you have the circuit and it seperates into the parallel wiring. where one wire goes upwards and the other one goes downwards, then they meet up again at certain point. in 3:10 the diagram. the current seperates accordingly to how much resistance is in each wire (top and bottom) and then adds back to original current when the two wires meet up again. eg original current was 6 amps, 2 amps goes up wire one and 4 amps goes down wire 2. then when the wires meet the current becomes 6 amps again.

[@amanhadi9305]

2020 anyone?

[@hassanhamze_14]

Im in 2021

[@noorahmad.35]

lol this video is made when I was 7 and now that I'm 19, I'm watching this.

[@hydragaming8259]

🤣🤣

[@owenduck]

voltage, potential, potential difference, current, amps, coulombs, charge flow. is it just me or is that overly complicated. correct me if I'm wrong but it could be simplified to volts and coulombs/sec or charge flow.

[@anticorncob6]

Thanks. I'm a physics student in college who never got the textbook, and I was doing fine until we got to circuits and then I was completely lost. Now I understand.

[@maydproductions4315]

You have an equation there stating I1 = I1 + I2 so stay focused next time. Also you quite often say we "have a certain voltage here" refering to a point on the circuit but a voltage is like you said in previous videos (so I know you know that) a difference in charge between two points so a voltage can't be in a point so be accurate please. Apart from that your videos really do help intuitive understanding :) keep it up but drop the obsession with flow direction^^

[@saifullahrahman]

hooraaay! thank u very much , u r the best!

[@hurumi]

@mexman48 He is just telling us what the convention is, even though the charges of electrons flowing, is actually out from the negative terminal. You can maybe think of it as: negative charges move to higher electrical potential positive charges move to lower electrical potential and the positive plate has higher potential so electrons move twds there. if it had been a positive charge it'll go to -ve terminal (lower potential).

[@gregorykarimian3813]

when he says positive negative it reminds me of the movie stand and deliver haha

[@TheFantasticalFunDIY]

Well....this definetly not how my teacher explained it and I am very lost. But it helped a lot so thanks :)

[@dularar8934]

Helpful still in 2019

[@ossi_2429]

Almost as if physics don’t change over time.

[@priyasundaram9806]

superb explanation

[@MalakWafa]

Thanks A LOT!!!

[@cristinap3173]

The obsession you have with the flow of current is REALLY distracting.

[@nickt3512]

+Cristina p I agree, just pick a convention and stick to it.

[@EliorFureraj15]

In my knowledge, as I was taught, the conventional current is just an arbitrary decision. And even though it is not "logical" in the case of such a circuit due to the flow of electrons, different electricity circuits or batteries use protons or ions to transfer charge. Conventional Current has to do with flow of charges, not specifically electrons.

[@memegod4433]

But it's important

[@spaff61]

they are from negative to positive but they are marked on as going the other way

[@jacksonputin9472]

You are the best.

[@IfeanyiJoshua-mu1gm]

Is the current from negative side constant

[@Sellennaaa]

I can't believe this is free.

[@senten123]

wow thank you so much

[@Genghiskaran]

cant wait til i get here

[@ahyenization]

Brilliant.

[@mintywind5872]

8:00 that is my sleep paralysis demon

[@farismustafa5389]

XD

[@lootingpig9713]

good stuff dawg

[@xxAnaconta]

no he makes it so simple

[@prohibitedarea8590]

Why do you draw your resistors as 'squiggly lines', is that common? The only way I have seen them is via the conventional rectangular symbol.

[@bintzubair]

Prohibited Area as he said, he enjoys doing it that way and you've never seen it anywhere else because most people are more reasonable that he is.

[@eppbrandon]

so basically what you are saying is the electrons gotta keep moving at the same pace though the unpaved road like it wasnt there

[@joetursi9573]

It might be instructive to say 'since the total resistance decreases the current increases , simply by Ohm's law written V/R=I.

[@Garrettwest2025]

does the voltage stay the same in a parallel circuit if i have a couple resistors do they each get whatever voltage i have.

[@minsatminsat]

why do u not put +ve n -ve signs for ur resistances? i don't know how to choose the app sign for my resistances

[@thatonedamnguy9524]

Ah, thanks sal for letting me pass my physics exam

[@violenceislife1987]

8:00 what madness is this?

[@earthismiracle]

Who else relax when he talks through earphones🤤

[@fleshcookie]

Sal's favorite color is definitely magenta. He gets stoked on it

[@HotPepperLala]

7:54, I don't get it, why does he say that it slows down at the resistor point, but then he says it must be not be slower than the other points?

[@jennifersauce1989]

Dude thank u