Resistors in parallel | Circuits | Physics | Khan Academy

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Resistors that run alongside each other. Created by Sal Khan.
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[@waffletits83]

the conventional way is killing this man

[@andresvallenilla4196]

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[@arnavpandey3571]

no man he explains nicely if you dont want to study why discourage others.

[@hassanhamze_14]

@@arnavpandey3571 true but the bsto might be dead in 2021

[@angrinord]

I just published printer burps on urban dictionary.

[@pintudey406]

Oh my god! 8 years ago😱

[@ivoryas1696]

@angrinord Based?

[@ClapBoomBoom]

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

[@Scars_on_my_nose]

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

[@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

[@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

[@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

[@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

[@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

[@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.

[@cursedswordsman]

I FINALLY UNDERSTAND THIS

[@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

[@Armarcoarmagedon12]

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

[@seasnek7024]

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

[@jamesgedak551]

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

[@victoriawu6551]

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

[@bkisme]

heh, i remember in my silly physics class running many resistors in parallel. I remember how confused I got when the voltage would eventually get really close to the voltage of the battery, and now it makes a bit more sense :p

[@megamusic49]

This helped me in science! Thanks Sal.

[@13DarkCookie13]

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

[@saqlainmohammed6616]

This helps me alot. thankyou salman khan.

[@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

[@Leonimy]

thankyou dude. So helpful!!

[@annetomori4919]

Wow. He just cleared up a lot

[@zanysazy]

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

[@kyomo2667]

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

[@SaifurSharif]

Comfortable explaining.Thank you sir.

[@Demolishion1994]

Mind Blown!!!

[@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

[@PeaceLoveFairytales]

thanks for making physics intersting...

[@htmlfreak]

thanks for the vid!

[@kita9620]

I love your little humours man haha

[@apaaja2672]

Thanks for the video

[@TheBoaConstrictor95]

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

[@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.

[@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?

[@gregorykarimian3813]

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

[@orbsandtea]

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

[@ScottieHProductions]

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

[@spaff61]

thank you for posting this

[@RainbowPaint]

Thanks Khan your awesome!

[@devigopalakrishnan2909]

Loved the squiggly circuit!!!🤩🤩🤩😍😍😍

[@imrannazari8642]

thx sir you are a life saver

[@mintywind5872]

8:00 that is my sleep paralysis demon

[@farismustafa5389]

XD

[@FerretDude41]

you are a good person

[@bosslovely27]

Thanks so much Mr khan

[@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!

[@TGODstayhood]

Thank you very much man your videos are very much appreciated

[@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.

[@Sanchitoooo]

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

[@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.

[@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.

[@amadohc]

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

[@priyasundaram9806]

superb explanation

[@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.

[@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.

[@ahyenization]

Brilliant.

[@jeffa2842]

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

[@senten123]

wow thank you so much

[@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

[@MalakWafa]

Thanks A LOT!!!

[@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!

[@fleshcookie]

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

[@Kamppi69]

Thx for the video. Nice and simple :). But what if the circuit would be divided in a way that only one side had a resistor like a lamp. In our textbook it said that the lamp would not light up because the current would flow through the route with no resistor. What's the logic behind this?

[@astrocreep51]

New color will be MAGENTA!

[@jacksonputin9472]

You are the best.

[@MosomeStingVT]

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

[@TalkAsSoftAsChalk]

More like Best Teacher In the World!!!

[@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

[@bkisme]

Hah, and now I remember the Modest Mouse song "Path of Lease Resistance" and now I know, despite (not) learning this in my physics class for weeks, that this principle is true, as electrons prefer to flow where there is least resistance, causing the 5 ohm resistor to carry more electrons so to speak as the 20 ohm resistor. Thank you. :)

[@GarrettH1]

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

[@mufasathelion5153]

2:56. does he mean I3?

[@hanibarnieh2789]

HAHAHAHA this dude probs finished college by now

[@paulkta8635]

@@hanibarnieh2789 YEP

[@thundere752]

@King David 😂😂

[@lootingpig9713]

good stuff dawg

[@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

[@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.

[@bhaktighotkar8657]

Okay there are two paths for flow of electrons so no bumping of electrons and there repulsion so no change in voltage but when they are passing through different resistances and meeting again how will current adds up and according to Coloumbs law how voltage is directly proportional to resisitance

[@xxAnaconta]

no he makes it so simple

[@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).

[@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.

[@noorahmad.35]

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

[@hydragaming8259]

🤣🤣

[@ohemdreee]

i love you. thank you.

[@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.

[@Genghiskaran]

cant wait til i get here

[@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

[@GerardoSilvaMendoza]

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

[@Vinodkumar-ej5yg]

Where r u now my man

[@glynch319]

"I call them printer burps" lol

[@dularar8934]

Helpful still in 2019

[@ossi_2429]

Almost as if physics don’t change over time.

[@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

[@jennifersauce1989]

Dude thank u

[@spaff61]

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

[@cruztison]

When you say contradictory sounding things, for example about how the electricity is actually flowing in reverse, while it might be true can be disruptive to someone who is approaching this information for the first time. It is interesting in a factual way but serves no benefit in grasping the concept explained.

[@aungvominn2146]

Very nice

[@IfeanyiJoshua-mu1gm]

Is the current from negative side constant

[@balaganapathy6869]

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

[@fantasticmrbongo]

pls tell me how to make a circuit where switch one has to be on for switch 2 to work

[@adityabiswas117]

I though the cathode gets reduced and the anode gets oxidized meaning the electron flow is from the anode to cathode

[@earthschool463]

Unbelievable, Sir. Great videos. Thank you

[@TheMraveragejoe]

Anyone know how the current distribute in a parellel circuit?