The water experiment with resistor (steel wool) is misleading. It shows that after adding resistance the current (water) will be different before and after the resistor. Whereas the current should be the same at any point in the series.
Having not done any of this stuff since GCSEs (I'm now 34) but my new job being relevant, I'm learning from scratch - and this was a really useful video, thank you!
Current actually flows from negative to positive. Not important in your ohms law demo but vitally important when working with diodes, transistors and everything else in the electronics world. It's always a good idea to stick with the fundamental truths starting with the basic building blocks. Otherwise, very good explanation especially your use of water as I have often used as an example.
Respected *Shawn Hymel* sir, I am a student, and literally the way you have teached electricity and electromagnetism is infinite wonderful!❤️ You have given us knowledge in the best way which nobody has ever given to us! In india , teachers don't teach us correctly, they just make. Us gulp the text written in the book. I request you teacher Shawn hymel that please try to teach us more physics like that you did in past(electricity, electromagnetism) I know making more such videos will take a lot of effort! But please try to help, Please reply teacher🙏🙏🙏👍❤️😁
Puzzle again. One another question, current is constant before and after resistor. A bit different from water. Able to really explain how electrons flow in the circuit and how it loses energy after passing thru the light bulb and still continue to flow?
The part about inconsistencies in the manufacturing of resistors could have included a brief mention of tolerance (the last color band on a resistor, which denotes the tolerance of the resistance value). Other than that minor note, a great explanation.
Hello I have got one doubt by the water circuit as analogy to the current circuit, As we know the current in the this type of closed circuit should remain constant (say 1 Amps in this case), but before valve the water flow in pipe is thick and after valve water flow in pipe is restricted, since water flow is the representation of the electric current so basically it shows in a close circuit the current changes???
Voltage is proportional to current If V=IR, then how there is a statement like "high current is the one which kills people and not the high voltage. (Isn't the current be high too if the voltage is high?) " (Is there anything to do with power? P=I²R)
What I've always heard was that "current kills you, not voltage," which implies that it's the flow of electrons (current) that causes heart failure and not the electric potential (voltage) between any two points on the body. It only takes a few milliamps flowing through the heart to cause fibrillation. To get those few milliamps, you can touch two points (with both hands) with a high voltage difference (skin has a high resistance), or you can have two electrodes stuck in your body with relatively low voltage (your innards have a much lower resistance).
Shawn Hymel is it possible to take high voltage without current acting on our body? In this the illustrator claims that he touches a very high voltage but a very low current (meanwhile he says not to touch the power outlet coz it has high current even in low voltage). As per my intuitions in the both scenarios the resistance is constant (skin) so how can a 200,000 volts have very low current. I can't get the anology behind this. Questions 2#: current kills and voltage doesn't, but current and voltage comes together isn't it? ruclips.net/video/ubZuSZYVBng/видео.html
This is a great video to provide a high-level understanding of a circuit however it seems the analogy breaks down a bit or I am missing something. Ohms Law says your circuit with a resistor has a constant current throughout circuit, I = E/R. That means the amperes, or number of charge carriers (or water in your analogy) is the same throughout the entire circuit. The current (or water flow) must be the same before the resistor as it is after the resistor. However in your analogy the water (or current) is much less after the resistor. What gives?
I was wondering if someone would notice this, well done :) It does indeed look like less water is flowing out of the resistor, but that's not possible as it's a closed system. The same amount of water *has* to be flowing into the resistor as out of it, since the resistor is neither creating nor destroying water. What you're seeing is a build-up of water before the resistor (similar to pressure), as the steel wool is only letting some of the water through.
In addition, if the same amount of charge carriers, or electrons, are flowing out of the resistor as into the resistor, then where does the energy for the heat that is created by the resistor come from? Obviously electrons are not being converted to heat. My basic understanding is that this "voltage is pressure" analogy is very misleading, that in fact two things flow down the wire - electrons as well as a, electric field, and it is both of those that play a part in the energy transfer.
The heat generation comes from the electrons bumping into atoms as they travel through the wire (or other resistive element). While the same number of electrons still makes it through the resistor, they have less potential energy as a result, which means a decrease in voltage (potential energy per unit charge).
Shawn, thanks and I'm with you so far. I guess your answer then leads to the question, what really is voltage? Clearly the electrons are not losing energy, as the current (amperes) is the same which means the charge in Coulombs is the same for any point in the circuit. So it's the same number of electrons before and after the transistor, and each electron has the same charge before and after the resistor (since an ampere equals 1C per second)....but the "voltage", the "electromotive force" is less after the resistor. So if voltage is not a physical property of the electron or the atom in the wire, what is it? What is physically different in the wire after the resistor versus before it? (Thanks for all the response BTW)
Resistance implies that resistors *allow* the flow of current, albeit regulated to some extent. This might be seen as trivial, but for me it's the opposite. Given this, how does "resistance" happen at the molecular / atomic / subatomic levels? What happens to electrons being pushed / pulled through a resistor?
3:41 Doesn't the current flow from negative to positive and not positive to negative because electrons are negative and thus attracted to the positive terminal? I mean I'm probs just confused cuz teachers have told me several things differently in physics
Yes, the flow starts at the negative terminal. The electrons are repelled from each other in a power source (battery) and exit the source at that point. You may read instructions that have you disconnect the negative terminal first. This will stop the flow of (or pressure from) electrons.
I am confused. V = I x R? I thought E = I x R. It seems to me that if you are going to substitute V for E, that you should also substitute A for I and O for R. So, instead of E = I x R, we now have V = A x O. If you are going to change one unit you should change them all. It seems only fair to Mr. Ampere and Mr. Ohm.
My science assignment just become SO much clearer. Thanks for another great video! Also, if anyone is interested in Hunger Games-type books, my new novel, Games of Worth, is now available on most online retailers such as Kobo, Apple, and Barnes & Noble, and I'd appreciate if some people would download it! Thanks!
great video but i am little bit confuse when you said "current will flow from the positive end to the negative ends" doesn't electrons work in reverse (from the negative to the positive end)?
It's not just Arduino. In circuits, electrons flow from negative to positive, but "conventional current" flows from positive to negative, as it is arbitrarily defined as the direction of flow of positive charge. You can read more about it here: en.wikipedia.org/wiki/Electric_current#Conventions
In an Ohmic Device (e.g. wire, resistor), resistance stays constant as voltage and current changes. Resistance can change due to other factors, like temperature. In Non Ohmic devices (e.g. diodes, transistors), resistance changes as voltage or current changes.
dre fernandez the water one? It's clear tubing and a bilge pump from a hardware store. The "resistors" were made from steel wool (caution: they'll rust after a few weeks), and the water has mica powder and blue food coloring so you can see it flow.
Your resistance is also affected my the fact that you’re measuring the resistance in your body by placing your fingers on the leads of the meter... A no no, bad practice because one day you’ll be measuring voltage... and AC along with very high DC hurts and sometimes kills
That's odd how do you go from 3.03v over 00.3A and magically with no sum at all get 101r, you clearly used a calculator or didn't show your working so this vid is utterly useless to anyone approaching ohm's law for the first time
The water experiment with resistor (steel wool) is misleading. It shows that after adding resistance the current (water) will be different before and after the resistor. Whereas the current should be the same at any point in the series.
Got a physics exam on Monday. This video was a MASSIVE help with my revision! Thanks!
Im working on science thanks for the help
I have one this Monday
Having not done any of this stuff since GCSEs (I'm now 34) but my new job being relevant, I'm learning from scratch - and this was a really useful video, thank you!
Current actually flows from negative to positive. Not important in your ohms law demo but vitally important when working with diodes, transistors and everything else in the electronics world. It's always a good idea to stick with the fundamental truths starting with the basic building blocks. Otherwise, very good explanation especially your use of water as I have often used as an example.
I was wondering if anybody else caught that.
FYI for any future readers, this (and the reason he uses I) are explained in his last video (what is electric current?)
Thank you so much for these videos on the basics. The text to visual representation is exactly how I learn and helps so much.
I'm taking electronics for the first time in my life at uni, I'm so glad I found this channel, thank you so much.
Glad it helped!
Respected *Shawn Hymel* sir,
I am a student, and literally the way you have teached electricity and electromagnetism is infinite wonderful!❤️ You have given us knowledge in the best way which nobody has ever given to us!
In india , teachers don't teach us correctly, they just make. Us gulp the text written in the book.
I request you teacher Shawn hymel that please try to teach us more physics like that you did in past(electricity, electromagnetism)
I know making more such videos will take a lot of effort! But please try to help,
Please reply teacher🙏🙏🙏👍❤️😁
how is a heart over some things
Who else had to watch this for their science lesson?
Meeeee 🙄
Puzzle again. One another question, current is constant before and after resistor. A bit different from water. Able to really explain how electrons flow in the circuit and how it loses energy after passing thru the light bulb and still continue to flow?
Sir,
I honor you an OSCAR in teaching.
How great you are.
HATS LIFT UP.
The part about inconsistencies in the manufacturing of resistors could have included a brief mention of tolerance (the last color band on a resistor, which denotes the tolerance of the resistance value). Other than that minor note, a great explanation.
Good tip, thanks! I may do a full video on explaining the color bands.
Amazing. Big applause. Please keep posting more!!!
Thanks!!!
This is a fundamental lesson in electrical engineering. Everyone should know this.
I'm loving this series so much! Keep up the good work guys :D
Good explained, after watching this video. I understood very well Current Electricity and Using Ohm's law. Thank you
Spark fun! You are a great teacher🤔🤔🤔
The relationship of proportionality of difference (voltage) to resistance is equal to current is, I think, an intuitive way to think about it.
well done, good teaching resource for my class. keep up the good work
Thanks! Glad you like it
This is very interesting and thanks for ur contribution
These videos helped me 6 years ago when applying for maintenance at USPS I got a 100 score c: I still have my usps ID badge to this day ✨️
Agreed...series is great and necessary before more advanced topics can be understood.
Hello I have got one doubt by the water circuit as analogy to the current circuit, As we know the current in the this type of closed circuit should remain constant (say 1 Amps in this case), but before valve the water flow in pipe is thick and after valve water flow in pipe is restricted, since water flow is the representation of the electric current so basically it shows in a close circuit the current changes???
Just relearned everything I did in a whole semester lol thank you
Voltage is proportional to current If V=IR, then how there is a statement like "high current is the one which kills people and not the high voltage. (Isn't the current be high too if the voltage is high?) "
(Is there anything to do with power? P=I²R)
What I've always heard was that "current kills you, not voltage," which implies that it's the flow of electrons (current) that causes heart failure and not the electric potential (voltage) between any two points on the body. It only takes a few milliamps flowing through the heart to cause fibrillation. To get those few milliamps, you can touch two points (with both hands) with a high voltage difference (skin has a high resistance), or you can have two electrodes stuck in your body with relatively low voltage (your innards have a much lower resistance).
Shawn Hymel is it possible to take high voltage without current acting on our body? In this the illustrator claims that he touches a very high voltage but a very low current (meanwhile he says not to touch the power outlet coz it has high current even in low voltage). As per my intuitions in the both scenarios the resistance is constant (skin) so how can a 200,000 volts have very low current. I can't get the anology behind this.
Questions 2#: current kills and voltage doesn't, but current and voltage comes together isn't it? ruclips.net/video/ubZuSZYVBng/видео.html
This is a nice explanation of V=IR
I like this format of the video. It is like a Bill Nye, but with Shawn Sparkfun the electronics guy.
Great Job sir
Mind blowing circuit:
5v -- R - R - R - 0v
Getting another voltage out:
5v - R - (3.3v) - R - R - 0v
This is a great video to provide a high-level understanding of a circuit however it seems the analogy breaks down a bit or I am missing something. Ohms Law says your circuit with a resistor has a constant current throughout circuit, I = E/R. That means the amperes, or number of charge carriers (or water in your analogy) is the same throughout the entire circuit. The current (or water flow) must be the same before the resistor as it is after the resistor. However in your analogy the water (or current) is much less after the resistor. What gives?
I was wondering if someone would notice this, well done :) It does indeed look like less water is flowing out of the resistor, but that's not possible as it's a closed system. The same amount of water *has* to be flowing into the resistor as out of it, since the resistor is neither creating nor destroying water. What you're seeing is a build-up of water before the resistor (similar to pressure), as the steel wool is only letting some of the water through.
In addition, if the same amount of charge carriers, or electrons, are flowing out of the resistor as into the resistor, then where does the energy for the heat that is created by the resistor come from? Obviously electrons are not being converted to heat.
My basic understanding is that this "voltage is pressure" analogy is very misleading, that in fact two things flow down the wire - electrons as well as a, electric field, and it is both of those that play a part in the energy transfer.
The heat generation comes from the electrons bumping into atoms as they travel through the wire (or other resistive element). While the same number of electrons still makes it through the resistor, they have less potential energy as a result, which means a decrease in voltage (potential energy per unit charge).
Shawn, thanks and I'm with you so far. I guess your answer then leads to the question, what really is voltage? Clearly the electrons are not losing energy, as the current (amperes) is the same which means the charge in Coulombs is the same for any point in the circuit.
So it's the same number of electrons before and after the transistor, and each electron has the same charge before and after the resistor (since an ampere equals 1C per second)....but the "voltage", the "electromotive force" is less after the resistor. So if voltage is not a physical property of the electron or the atom in the wire, what is it? What is physically different in the wire after the resistor versus before it?
(Thanks for all the response BTW)
Resistance implies that resistors *allow* the flow of current, albeit regulated to some extent. This might be seen as trivial, but for me it's the opposite.
Given this, how does "resistance" happen at the molecular / atomic / subatomic levels? What happens to electrons being pushed / pulled through a resistor?
it's called tolerance, color bands on the resitor gives the information and there's a chart matching that information. cool video
@SparkFun Electronics nice video!
you remind me of Oscar from odd squad, in a good way
3:41 Doesn't the current flow from negative to positive and not positive to negative because electrons are negative and thus attracted to the positive terminal? I mean I'm probs just confused cuz teachers have told me several things differently in physics
Yes, the flow starts at the negative terminal. The electrons are repelled from each other in a power source (battery) and exit the source at that point.
You may read instructions that have you disconnect the negative terminal first. This will stop the flow of (or pressure from) electrons.
I learned something new today; air is a fluid! 1:05
Was about to comment this
It is soo compacted that it acts like a fluid
He is correct
He is correct, Air IS a fluid.
He's right air is a fluid
Shawn - YOU - are the new Mr. Wizzard! I expect to see a regular show on national TV with your presentations.
You’re Pretty Cool Shawn/Sean!
I don't know what i'm doing here. I'm an auditor.
im an electricuan
I'm a person who likes to learn
Im gay
Then go away idiot
Why do you use conventional and not real electron flow for current? I don't understand why most people use conventional and not real.
How the voltage drop across the resistor is calculated? As the current is same through the circuit
Tomorrow's My physics test I wish I could get a brain like him
Sir pleasee reply...why can’t we write I proportional to V and then proceed to write I/v=R..why doesn’t it work that way?
nice 1. got it all. thanks
I am confused. V = I x R? I thought E = I x R. It seems to me that if you are going to substitute V for E, that you should also substitute A for I and O for R. So, instead of E = I x R, we now have V = A x O. If you are going to change one unit you should change them all. It seems only fair to Mr. Ampere and Mr. Ohm.
My science assignment just become SO much clearer. Thanks for another great video!
Also, if anyone is interested in Hunger Games-type books, my new novel, Games of Worth, is now available on most online retailers such as Kobo, Apple, and Barnes & Noble, and I'd appreciate if some people would download it! Thanks!
Thank you professor
great video but i am little bit confuse when you said "current will flow from the positive end to the negative ends" doesn't electrons work in reverse (from the negative to the positive end)?
thanks man, i am interested in raspberry pi is it the same?
It's not just Arduino. In circuits, electrons flow from negative to positive, but "conventional current" flows from positive to negative, as it is arbitrarily defined as the direction of flow of positive charge. You can read more about it here: en.wikipedia.org/wiki/Electric_current#Conventions
ah! now i understand ,thanks and btw your videos are super helpful and entertaining ;)
Thanks! Glad they help :)
yes he is, check out his website shawnhymel.com/about/
@sparkfun keep it up
Thanks 👍
does resistance depends upon voltage and current ? pls ans sir
In an Ohmic Device (e.g. wire, resistor), resistance stays constant as voltage and current changes. Resistance can change due to other factors, like temperature. In Non Ohmic devices (e.g. diodes, transistors), resistance changes as voltage or current changes.
U
that bow-tie is fire
Botw is fire
HWR 94 facts
Nice .we can Gane knowledge
1826??
wow , I like it
thank you so much 😇
Same
Same
Same
Well but current right side of R is equal to left side of it.....
animation slides should be more====when explaining any topic
umm guys...may I know the materials he used in that experiment?? plss for our class project
dre fernandez the water one? It's clear tubing and a bilge pump from a hardware store. The "resistors" were made from steel wool (caution: they'll rust after a few weeks), and the water has mica powder and blue food coloring so you can see it flow.
Got a circuit you wanna build? Test it out here first. Spot: 'Circuit Solver' by Phasor Systems on Google Play.
Very similar to distance, speed and time formula
Helped so much thank you
Wow someone who are using fun to teach physics
Love it but the mastermind is/was Mr. Ohms, himself.
oh my god I have an exam next week on this ugggggghghghghghhghgg
Suprvv video thanku
awesome
Agree
What makes electrons electrified? Why are neutrons not electrified? Are they spent Protons that have lost their charge with time?
UFOhunter What makes them different is their subatomic structure, they have a different quark configuration.
now you're just making shit up. The fundamentals are unknown to us.
You might want to Google quarks
Man i gotta do a summary on this crap
Translation
Negative to positive amigo!
Electrons flow from negative to positive. "Conventional current" flows from positive to negative.
Shawn Hymel oh cool thanks for explanations
🎩
he reminds me of leonard hofstadter
كتاب الوافي دا غريب جدا😂❤
انت دفعه 24 وانا دفعه 25 شكلنا مفيش غيرنا بس الي جه هنا 😂😂
Here because I need to understand the new deftones album
Sappo Anselms
Ω : futile
hi teachers
I’m here because of my tech crew test for college
David warner
nice
Thomas Carol Clark Helen Clark Frank
the current flows from negative to positive (3:41) not positive to negative
Hugs Gaming electrons flow from negative to positive. "Conventional current" flows from positive to negative.
In a way doesn't current flow both ways at once?
AC does, DC doesn't
pain
ohms low sangha
Is he Alton Brown's son? Sure sounds like him.
👍👍👍👍👍
Your resistance is also affected my the fact that you’re measuring the resistance in your body by placing your fingers on the leads of the meter...
A no no, bad practice because one day you’ll be measuring voltage... and AC along with very high DC hurts and sometimes kills
21 oink
👀
here because I misstyped IGN lmao
Kya bolra Kya malum
Like good ☺☺
That's odd how do you go from 3.03v over 00.3A and magically with no sum at all get 101r, you clearly used a calculator or didn't show your working so this vid is utterly useless to anyone approaching ohm's law for the first time
is anyone else doing this in quarantine
*if youtube still exists twenty years later the next generation would be so confused about this comment*
Yah
Thank you, you learn this in first grade.
doodoo
Ye Dad
You completely skipped over how you got .03 amps.
No he didn't! The power supply gave the voltage and current readings. 4:08