ATTENTION: EVERYONE WHO IS ASKING ABOUT -20 VOLTS.... His equation Vrise - V drop = 0 is the equation for the whole circuit. On the left side, where the battery is, there is a 10V rise....on the right, where the resistor is, there is a 10V Drop...this is where he is getting 10(rise)-10(drop)=0 | That rise= -10 is, like he said, just another way of writing a drop. I understand the confusion, there is not much point of writing that unless he wrote 0=sum of voltage rise ... in which case that specific "rise" on the right would technically be negative due to the resistor, however that is often confusing and he just was using this as a way to get you to understand that this is a decrease in voltage. His math however is all correct.
@mstfarzanaakther80463 жыл бұрын
Thanks a lot
@Rick-gd6pe3 жыл бұрын
By any chance do you know what the voltage is actually doing when it drops?
@brandonbennett49702 жыл бұрын
@@Rick-gd6pe the potential energy between individual electrons in the wire is dropping, meaning they are getting further apart. Because energy should be conserved in an isolated system consiting of the wires and resistive element, the loss in potential energy presents itself as an increase in heat (or light). This is a vast oversimplification of what actually occurs on the subatomic level and is not totally correct but it is a great way to think about it when first getting started, and will take you pretty far in electronics.
@L28PriyankarDas4 ай бұрын
@@brandonbennett4970 If the distance between two electrons is increasing, the potential energy of the system decreases overall,but why doesn't the energy comes off as kinetic energy? I mean shouldn't the speed of electrons in the system increase?
@brandonbennett49704 ай бұрын
@@L28PriyankarDasthe electrons collide with resistive material and lose energy. They don’t get a chance to increase their kinetic energy because it is lost as heat
@dannewlon58257 жыл бұрын
Great review, had all this 40 years ago in college, but basics are always applicable.
@aselim20.5 күн бұрын
I watched it twice and I have taken notes in 2024-2025 1st semester.
@jasssa86358 жыл бұрын
the voltage directions are wrong so the numbers become wrong too. this is very misleading
@mahshidpanah88513 жыл бұрын
Voltage drops across the components (resistors) are positive if a loop direction is opposite to the current direction
@curtpiazza1688 Жыл бұрын
Beautiful! 🎉 😅😊
@RR-ex2uv7 жыл бұрын
Thank you so much for this video! I have been really struggling with understanding when voltage and amp sources are equated as being negative verses positive, especially when there is a mix of both in the circuit!
@stevenroberts3148 Жыл бұрын
QUESTION: I thought that the voltage throughout a circuit was constant. I'm confused by the whole "voltage drop" thing. Shouldn't it be constant through and after hitting the resistor?
@raheelbelal5848 Жыл бұрын
in series it drops, but in parallel it stays the same
@smgf-dm3zu Жыл бұрын
No
@demonslayerer Жыл бұрын
I ain't no expert but from my understanding of volt, volt is just energy applied on charge to overcome the "opposing force" (Resistance). Or in other words force to get charges moving but force will be zero if there is no Resistance or charges are already moving, therefore if Resistance is zero either volt is zero (meaning charge need no force to overcome Resistance since it's already zero) or the current is infinite (which again means the same but this time it specifies that charges ARE moving).Resistance causes voltage causes current. So answer to your question, voltage isn't constant. (Correct me plz if I am wrong in anyway, i highly appreciate it.)
@L28PriyankarDas4 ай бұрын
@@demonslayerer sadly you are not completely correct,Your relation between resistance and volt(potential diff) is accurate,but in no way volt is energy required to overcome opposing force.Honestly i can not explain it here in the comments.
@snakes-and-ladders4 ай бұрын
Voltage is the energy per unit of charge. As charged particles pass through the components of a circuit, they will transfer energy to them. This results in a voltage drop.
@arfairfan98705 жыл бұрын
Thanks a lot
@aboringuy4 жыл бұрын
Great video! Just one question: Will running two 12V fans in series off of a 24V power supply overvolt the fans? Or does the voltage have nothing to do with this equation?
@ChocoBaiterEUW4 жыл бұрын
has nothing to with that. do 12v to both.
@_aidid7 жыл бұрын
(For 2:19) If I connect one voltmetre across the battery and another voltmeter across the resistor will the voltmeter across the battery show +10V and the voltmeter across resistor show -10V ?
@JustinHatter7 ай бұрын
Thanks for the help!
@chandhnichowdhry28115 жыл бұрын
Thank you... It was very helpful 😊
@leetcoder11594 жыл бұрын
really?
@MOHTAHA20087 ай бұрын
I did understand the concept, but I do have a question tho, does kerchhoff’s law mean that (theoretically) the delta V in every closed series circuit is equal to zero?
@steventodd58843 ай бұрын
Yes because they will all cancel eachother out. The net change would just be zero.
@samriddhi09063 ай бұрын
thankyou!❤
@unknown-vq1gj6 жыл бұрын
If drop is 10 volts and rise is -10 volts. Formula V rise - V drop = 0; in this case -10 (rise) - (+10) drop= -20?
@harryiii33615 жыл бұрын
Those two values are referring to what is happening at the resistor, not the whole circuit. He was only pointing out that a drop of 10V is exactly the same thing as a rise in -10V
@medhatithidas50634 жыл бұрын
10 volt drop is same as -10 volt rise and you can also say that 10 volt rise is same as -10 volt drop. If you cosider it like this and the formula is that Rise - Drop =0 Then -10 - (-10) = -10 +10 = 0 Here I have considered 10 Rise as -10 drop and 10 drop as -10 Rise. It is quite confusing though but yes this is also a way how it works.
@abdeslamkabiri93928 жыл бұрын
-10-10=-20
@gouenjigouenji71268 жыл бұрын
Good eyes.
@abdeslamkabiri93928 жыл бұрын
:)
@fatimaafaf57408 жыл бұрын
exactly!!
@abdeslamkabiri93928 жыл бұрын
;)
@pn26967 жыл бұрын
I had that question too😏😏
@JamesDean-wv7iw9 ай бұрын
Sort of made sense to me, how I am suppose to get my head around KIV and KCL, I have no idea
@parasonu18 жыл бұрын
what happens when charges move flat I mean why does potential drop occurs only at resistors? I mean when an electron travels from negative end towards the positive end it continuously loses potential so why we don't consider potential at flat areas where no resistors are present ?
@sherllymentalism47565 жыл бұрын
VIKRAM SHARMA it's very low so we usually ignore it. Not always, however
@roycekimmel2 жыл бұрын
That is covered in resistivity though for circuit design is often negligible
@yahyamohammed67293 жыл бұрын
It makes sense that it's 5 volts in the middle node, but how do you get to 5V? Mathematically speaking
@СщькфвуЫефдшт3 жыл бұрын
You can look at each resistor as a voltage drop. In this case 10 V between 2 resistors drops by 5 each time.
@andycoutts5172 жыл бұрын
@@СщькфвуЫефдшт But why does 200ohms create a 5volt drop?
@alex3l4 Жыл бұрын
@@andycoutts517since the two resistors are connected in series, you can calculate the resultant resistance (R1+R2=200) and using Ohm's law (I = U/R = 0.05 A), calculate voltage drop by (U = R*I = 0.05*100 = 5 V)
@Inaflap8 жыл бұрын
@4:30 you suddenly changed the term from voltage drop to voltage fall. Otherwise this was a good video.
@gouenjigouenji71268 жыл бұрын
It's the same.
@gouenjigouenji71268 жыл бұрын
It's not a flaw
@dilkashaikh8 жыл бұрын
how to download physics playlist lecture in one times please tell me the procedure or name of software i want to all playlist videos in one times thank you
@swapnilg.59968 жыл бұрын
Khan Academy App
@HTCRAZYKWA Жыл бұрын
So does it always work in a manner that 100 ohms is always one tenth of the or is that just an example for the current equation
@3lxlDeMonlxl18 жыл бұрын
excellent video how do you do it?
@steveevets11304 жыл бұрын
"I'm going to arbitrarily call this 0 volts". Why? Ohms law says that the voltage there will be .05V. Is that not correct?
@akshatshah39253 жыл бұрын
0.05A is the current, not the voltage.
@PatrickMoto974 жыл бұрын
Thanks bro
@СщькфвуЫефдшт3 жыл бұрын
To clerify, the rise isn't a - based on the equation you followed? There's some conflicting values confusing me...
@pooffdk3 жыл бұрын
you can do one thing here and just use the clockwise technic it will be less complicated for you
@wisnuaimariyadi8403 жыл бұрын
far way better
@alexjag57788 жыл бұрын
Thank you
@dinsrock16 жыл бұрын
Hey, in 3:03 there is a error is guess, look, u have taken voltage rise as -10 and voltage drop as +10. The formula u told is saying voltage rise minus voltage drop=0 . If i substitute that " minus 10 minus 10 which leads to -20. Can u xplain on this.
@surajphaniharam87344 жыл бұрын
Actually the rise is 10, look when it passes through volt meter and the drop is 10 as he said so that implies 10-10 which gives you 0 👍
@mahes92633 жыл бұрын
Can someone give me a proof why the voltage drop should be the same as the battery?
@roycekimmel2 жыл бұрын
The potential energy is exhausted over the path of the circuit much like lifting an object off the ground to increase it's potential then dropping it only for it to return to it's original potential (converting potential into kinetic energy for example)
@jwilham4 ай бұрын
you need to explain why you are going from 10 volts to 0, and why you are going from 10 to 5 to 0. how unnecessarily complicated trying to explain rise with decrease of voltage.
@deepakkr.7736 жыл бұрын
Good
@hasibullah39027 жыл бұрын
Y u no discuss complex circuits??I get stuck in the maths given in my book
@Tom-gc8ik8 жыл бұрын
Ok. Why did you "arbitrarily" name nodes with negative voltages? Is it with respect of the voltage in? And why does -10-10=0? Why is the node between the 2 resistors 5 ohms? Why does the voltage rise and drop in a circuit after sal showed its uniform all the way around? These are things that should be addressed. Instead of just saying this is it, you should leave the viewer with the knowledge of why this works and why it's useful. No intuition developed from any of your videos. I'm sorry. I'm sure you're a brilliant engineer, but when it comes to conveying your knowledge/intuition on a subject, not very good. Thanks for the effort though
@omega68727 жыл бұрын
That was the best way to put it !
@ombatra10007 жыл бұрын
That -10 is just to indicate direction .
@MyrahOfficial4 жыл бұрын
Bruhh dude it was so easy and awesome ... honestly u just read once from a book, come back to it and then you'll see its fab
@michaelpiotto49883 ай бұрын
voltage rise is not -10V, that make no sense. It drops 10V and then it drops again -10V. or it drops 10v and rises 10v.
@worldofmusic10584 жыл бұрын
I am a 13 yr old watching it so it is a bit difficult for me to understand this. Can you guys please help me at this?
@robbydiaz49224 жыл бұрын
yeah so what's your problem
@ajaykumarray89254 ай бұрын
First grow upp
@IbnMeer7868 жыл бұрын
why we taken conventional current +ev to _ev??
@jebeccajamil8 жыл бұрын
although we know that electrons flow from -ve to +ve, conventional current is followed because by it makes the calculations much easier.
@insajderpapaj46506 жыл бұрын
So complicated explanation of a sumple thing
@aselim20.2 жыл бұрын
I wrote it
@sebp4002 жыл бұрын
he's calling branches, nodes? I'm learning and it's confusing.
@lihlezonela63777 жыл бұрын
ever had of LOGIC gate ntwana yam?
@subhashkale26547 жыл бұрын
This is the most disappointing video of khan academy...... 😢😢😢😢😢
@talibqadri64036 жыл бұрын
exactly
@archivvithlani6610 Жыл бұрын
it's such an easy topic?
@physicsclassofshamimsir83296 ай бұрын
Ure being disappointing
@ZollMisc-c1w2 ай бұрын
Thompson Jose Perez David Garcia Kenneth
@mohitchahal94767 жыл бұрын
couldn't understand...
@yawarkhan83095 жыл бұрын
Rise negative so_10_10=20 why u write 0
@TheRoxas13th8 жыл бұрын
Why the voltage drops?
@salunkhesaurabh2018 жыл бұрын
TheRoxas13th Volts is the difference of potential at two point ... so in battery we consider (-ve) as (0)volt and (+ve) as (V)volts
@loneventhorizon7 жыл бұрын
it didn't the current flows from - to +
@loneventhorizon7 жыл бұрын
america vs everyone else
@danieljoseph64047 жыл бұрын
because the total voltage in the circuit is 0 and theres only one resistor. so after it passes the resistor it would be 0.
@vomont6 жыл бұрын
Daniel Joseph what if there is no resistor. What happens then?
@hafizulsedutrik2 ай бұрын
কে কে মেডিকোর বই দেখে আসছো?
@Cloudfights2 жыл бұрын
💯💯💯💯
@chaddonschaddons70846 жыл бұрын
Pretty badly explained because 'rise' has nothing to do with the perception of view, it has to do with the travel of conventional flow. Just to further prove this, imagine the resistor is sideways, left to right instead of up and down. There is still a drop on that resistor even though it's going sideways. The problem with this instructors explanation is that he is inferring that voltage is a sort of travel, but it is not gradual travel, it is explicitly a measure of the difference between two points. Here's where this video fails and it is the problem with the conveyance of the teaching.
@aizasaed1707 жыл бұрын
where the hell has sal gone😟😟
@TheAlexsennin5 жыл бұрын
Aiza Saed 😢
@MyrahOfficial4 жыл бұрын
Ikrrr
@chriswoolson73526 жыл бұрын
This video was totally not correct. With different resistances, it is totally different
@hunterhunter1095 жыл бұрын
This video is really informative unlike half of those Indian videos which one can't even understand the language