Professor Roger Bowley is back in the lab explaining the Hall Effect, which involves electric current and magnetic fields. More physics videos at www.sixtysymbols.com/
0:24 the Lorentz force: A magnetic field bends the current. 1:40 the question posted by Edwin Hall 4:00 It's not the voltage down the wire. It's the voltage across the wire. 4:34 the use of Hall Effect
Lots of people know lots of stuff about lots of things, but only a few have the gift of passing on that knowledge in a concise way that can be easily understood. Thanks much for the great explanation professor.
You guys are great in that you make this sort of vital information simple for anyone's understanding. And just as importantly it seems you are doing something you enjoy thoroughly and comes naturally. Bravo and thank you.
I'm an electronic engineering student (1st year UG). I've used a PIC microcontroller with a Hall Effect sensor to measure the RPM of a rotating shaft (about a year ago). I think back then I would have benefitted from such an easy to understand explanation - it would have saved me from a lot of headaches! A very interesting video as per usual - the enthusiasm and friendliness of the professors’ is what makes this channel so great! Many thanks to Brady also. Thanks.
Having worked in a thermoelectric materials lab, the Hall effect is a very important metric to have! And now working on cars, Hall effect sensors are used all over the place, so this is a very useful video to help explain to customers why their speedometer isn't working or whatever! Thank you ❤
Professor Bowley would be a greate teacher for basic (or advanced) electronics courses; it's really great how he can explain correct, significant and still in a way that is easy do understand.
We use this for measuring RPM . Several small magnets are attached to shaft so that they pass by a Hall Effect sensor when the shaft is turning and we count the pulses generated by the sensor. There are other ways of measuring RPM, of course, but this method is cheap, reliable, and essentially frictionless.
Another great thing about the Hall effect is that it was used to discover which particle actually moves in an electric current. In a wire, a flow of positive charges moving in one direction is indistinguishable from a flow of negative charges in the other. With the Hall effect, the charge buildup on the sides of the wire will be opposite depending on which charge is moving. This effect is the reason we know that electicity is due to electrons moving instead of protons.
@chrisofnottingham It's also used in brushless motors as a feedback mechanism so that the controller can switch on the right coil at the right place at the right time when a rotor magnet passes over it.
Great explanation. Thank God for the Internet. This professor has a passion for teaching - the not so good academics who seem to derive pleasure from making things seem 'harder' than they are... :-)
Resistance is voltage over current not voltage times current. It's a mistake that I make sometimes too. I always enjoy the sixty symbols videos. Keep them coming.
Hang on, I'm not quite sure what the significance of that Resistance quantity is at 4:20? Does that become a useful quantity for measuring the Hall Effect?
these are used in sensors in many applications including most cars and machinery. They are called hall effect sensors. eg. crank angle sensor, proximity sensor, speed sensors, linear and rotary decoders
alarm door switches are normally just that, a switch (called a reed switch) hall effect sensors are used more in cars to detect the crank angle, or another fast moving magnet (as reed switches wont work fast or accurate enough, and reluctance type sensors are large and prone to noise)
Matter of fact, the Hall Effect is used in several modern automotive technologies such as the camshaft sensor, crankshaft sensor, and the Anti-Lock brake system.
I thought it had something to do with the spin of the electron. spin up goes on one side while spin down goes to the other? I read an article about the recent discovery of the hall effect on light and they explained it by spin up/down electrons
There’s been some developments on muon catalyze fusion using the hall effect And you can use to Hall effect control plasma to control the electron holes the positive and negative ions in the way the electrons line up with the positive negative ions and holes
Sorry if that was already answered in the comments but shouldn't the beam be deflected away from the magnet as well or does that contraption simply not allow for anything but vertical movement? Also, on the metal sheet...if a negative charge is travelling equidistant between a negative and positive charge, shouldn't it still be attracted to it's opposite charge and not simply travel between the two?
If the plate with a current though it was placed close to the green 'beam' will the magnetic field still affect the beam to the same extent or will it be reduced?
I enjoy your explanations, Professor. The Hall Effect was unknown to me. At about 4:40, you mentioned that apparatuses often go hay wire when you use them. In uncertain circles,we call this the (Wolfgang)Pauli Effect. How about doing a presentation on it?
A good every-day example for Hall effect sensors is in joysticks. The oldest joysticks were digital, meaning they basically pushed down a button when you moved the stick, kind of like on a modern controller's D-Pad. Then they started using analog potentiometers, which let current through based on how much of two metal surfaces are touching each other. Problem there is the metal wears out, gets dirty, or oxidizes. Now they're starting to use Hall sensors and permanent magnets; no degrading!
You are correct todiwan. Conductive materials like metal have an interesting material property where electrons sort of just "float" around in the material and can thus be pushed around within the material (which is why they are conductive) The positive charge is the "absence" of all the electrons (it's positive relative to the more negative side).
It is also often used to measure rotational velocity or rotational position in various things. If there is something like the teeth on a cog or a shaft with a non uniform cross-section then a Hall effect sensor will give a varying reading as the thing rotates. This can be filtered and counted to give a speed or position. Advantages of this are that it is non contact method and also it continues to work in dirty environments when optical methods might be unsuitable.
@mcjhn The origin of the force on the current-carrying wire is the Lorenz force. Each moving electron that makes up the current experiences a Lorenz force, (the force that bends the path of the charge in the video) and the forces on each electron add up to give a net force on the wire which is proportional to the current times the strength of the magnetic field. The force is maximum when the wire lies perpendicular to the magnetic field. The Lorentz force is the common feature.
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sir,u just made this concept 100 times clearer...
"I touch pieces of apparatus and they break down"
I can relate, so hard.
0:24 the Lorentz force: A magnetic field bends the current.
1:40 the question posted by Edwin Hall
4:00 It's not the voltage down the wire. It's the voltage across the wire.
4:34 the use of Hall Effect
👍
Best explanation on youtube
If you really mean it then i will not look for another video
I wish I had a teacher like him.
This finally explains the Monty Hall problem for me, thanks!
+YourLaughzZ You know--Door #1, Door #2, or Door#3. Quite a vexing problem, actually, especially when Carol Merril is pointing at the doors!
One door has a magnet, two doors have sensors.
If only my professors had the ability to explain stuff as beautiful as this gentleman here.
"I touch pieces of apparatus and they break down".
Glad to know I'm not alone in this...
Lots of people know lots of stuff about lots of things, but only a few have the gift of passing on that knowledge in a concise way that can be easily understood. Thanks much for the great explanation professor.
Sirs, you're ab-so-lu-te-ly BRILLIANT!! I can't stop watching this "sixtysymbols" series! Addictive!
Thanks for the excellent job!
Thank you professor, you simplify the explanation of Hall effect by making it quite interesting and understandable
You guys are great in that you make this sort of vital information simple for anyone's understanding. And just as importantly it seems you are doing something you enjoy thoroughly and comes naturally. Bravo and thank you.
That little demonstration was really useful. Puts the theory into context.
I knew about the hall sensor - that is was for detecting magnetism, but now I know how it works. Thanx!
I'm an electronic engineering student (1st year UG). I've used a PIC microcontroller with a Hall Effect sensor to measure the RPM of a rotating shaft (about a year ago). I think back then I would have benefitted from such an easy to understand explanation - it would have saved me from a lot of headaches!
A very interesting video as per usual - the enthusiasm and friendliness of the professors’ is what makes this channel so great! Many thanks to Brady also.
Thanks.
Finally, the video I was looking for! Thank you so much for explaining this so well!!!
I like the way Professor Bowley explained the problem. He must be an incredible lecturer. Thank you
my man bowley is a physics king. thanks professor, that really helped to understand and visualise the effect
Thank you so much. It could not have been explained any clearer.
This is a very clear and interesting explanation! Thanks so much for this.
This is a great video. Very nice explanation. Thank you so much. This really helps me to understand this topic.
finally a video that clearly explains the hall effect to me, I really loved this!
Having worked in a thermoelectric materials lab, the Hall effect is a very important metric to have! And now working on cars, Hall effect sensors are used all over the place, so this is a very useful video to help explain to customers why their speedometer isn't working or whatever! Thank you ❤
Sir, that was absolutely brilliant. You have explained to me what my textbook has failed to do for the past two days in just over six minutes.
Marvelous and easy to understand. Now I know what the Hall Effect is! Thanks for yet another wonderful video!
Clear message, clear structure, easy to understand, thank you
I've been playing with brushless motors recently... so it's nice to find out what that Hall effect sensor is actually doing. :)
This is what I wish they showed me in physics 12 =) thank you Sixty Symbols I love you guys for this.
Excellent explanation. I've used them for years, never quite had a handle on how they worked.
A really excellent explanation and demonstration by a first-rate teacher.
When I was in the robotics game, we used brushless DC motors with Hall-effect sensors, known simply as "halls".
Thank you for these videos... They often help to illustrate and make more memorable some dull classes in A Level Physics. :)
This saved my life! Best explanation ever!
Professor Bowley would be a greate teacher for basic (or advanced) electronics courses; it's really great how he can explain correct, significant and still in a way that is easy do understand.
The best explanation of Hall effect ever !!!
thanks, i just remembered the Hall effect!
Fantastic explanation, sir. Cheers!
Thank you for that illustrious explanation
We use this for measuring RPM . Several small magnets are attached to shaft so that they pass by a Hall Effect sensor when the shaft is turning and we count the pulses generated by the sensor. There are other ways of measuring RPM, of course, but this method is cheap, reliable, and essentially frictionless.
Very well explained! Keep it up!
Finally, someone who can explain it clearly. thanks!
Professor Bowley, I wish you'd be my best friend. Watching you teach makes me happy.
Great explanation - thank you.
Physics homework done! Thank you so much this is really helpful and much easier to understand than the text in my school book:)
Thank you sir. What my sir couldn't make us understood in 2 years, you did that in 6 minutes.
I wish I had a teacher like you...Thanks a million
Awesome video, super interesting!
Another great thing about the Hall effect is that it was used to discover which particle actually moves in an electric current. In a wire, a flow of positive charges moving in one direction is indistinguishable from a flow of negative charges in the other. With the Hall effect, the charge buildup on the sides of the wire will be opposite depending on which charge is moving. This effect is the reason we know that electicity is due to electrons moving instead of protons.
I just fell in love. Thank you Doc.
Was this concept used in "Induction switch"?
Great explanation, thank you so much!
Omg this really helped me where I have some doubts
Very well explained 👏👏
Beautifully explained
Very clear explanation. Thank you, sir!
I've been spelling it "Hail effect" all this time. I guess I should throw away all my notes now.
Dude you just explained to me how the Inductor works. MANY thanks!
I really like the simple explanations. :)
@chrisofnottingham It's also used in brushless motors as a feedback mechanism so that the controller can switch on the right coil at the right place at the right time when a rotor magnet passes over it.
thanks professor bowley
Great explanation. Thank God for the Internet. This professor has a passion for teaching - the not so good academics who seem to derive pleasure from making things seem 'harder' than they are... :-)
Resistance is voltage over current not voltage times current. It's a mistake that I make sometimes too. I always enjoy the sixty symbols videos. Keep them coming.
Explains everything, thankyou very much!
Hang on, I'm not quite sure what the significance of that Resistance quantity is at 4:20? Does that become a useful quantity for measuring the Hall Effect?
Awesome, learned something new :)
thanks again sixtysymbols :D
"But it's nothing to do with the Ohm's Law, this is the Hall Effect"
reminds me of the commercial "This is not just food, this is M&S food" lol
Excellent explanation sir.
these are used in sensors in many applications including most cars and machinery.
They are called hall effect sensors. eg. crank angle sensor, proximity sensor, speed sensors, linear and rotary decoders
alarm door switches are normally just that, a switch (called a reed switch) hall effect sensors are used more in cars to detect the crank angle, or another fast moving magnet (as reed switches wont work fast or accurate enough, and reluctance type sensors are large and prone to noise)
I wish I had these videos when I was in high school. If I was a science teacher I would definitely show them to my classes.
That bit about theoreticians causing apparatus to fall to bits is absolutely true - I can recall quite a few funny stories to that effect...
More of Professor Bowley please 😊
Brilliant video! Great explanations! Keep doing the good work! Please! :P
Really cool, just got my idea for my advance lab technique term project.
I've had to do even calculations with the hall effect and still had absolutely no idea what the hecc I was doing until I watched this video, nice
nice and clear explanation..
Matter of fact, the Hall Effect is used in several modern automotive technologies such as the camshaft sensor, crankshaft sensor, and the Anti-Lock brake system.
"Plan(c)k length" and then "Hall effect"... this professor is onto something!
Blew my mind 🤓 Great stuff! SUBBED ❤
I thought it had something to do with the spin of the electron. spin up goes on one side while spin down goes to the other? I read an article about the recent discovery of the hall effect on light and they explained it by spin up/down electrons
***** That's the spin Hall effect. It's an analogous but different effect.
Really this so helpful to me to understand concept about vtg and current by hall effect.( Sir you are really best to explain any concept
There’s been some developments on muon catalyze fusion using the hall effect And you can use to Hall effect control plasma to control the electron holes the positive and negative ions in the way the electrons line up with the positive negative ions and holes
I always loved those things!
Sorry if that was already answered in the comments but shouldn't the beam be deflected away from the magnet as well or does that contraption simply not allow for anything but vertical movement?
Also, on the metal sheet...if a negative charge is travelling equidistant between a negative and positive charge, shouldn't it still be attracted to it's opposite charge and not simply travel between the two?
very educative. Thank you Regards
Would you do a video on the Hall Effect thruster? Thank you for this, by the way.
Thank you!! Best explanation!
If the plate with a current though it was placed close to the green 'beam' will the magnetic field still affect the beam to the same extent or will it be reduced?
I enjoy your explanations, Professor. The Hall Effect was unknown to me. At about 4:40, you mentioned that apparatuses often go hay wire when you use them. In uncertain circles,we call this the (Wolfgang)Pauli Effect. How about doing a presentation on it?
thanks , best video that explain the hall effect....
Sir you have charisma
you can teach students like no one else
Don't forget one of the bigger uses of the Hall Effect. It's used as a sensor in cars to detect the rotation of the spark rotor.
such a great teacher I want the same !!!
cool :) i love listening to good teachers
Thank you. Nice explanation. But, I didn't understand that how will a positive charge get induced on the other side of the metal ?
A good every-day example for Hall effect sensors is in joysticks. The oldest joysticks were digital, meaning they basically pushed down a button when you moved the stick, kind of like on a modern controller's D-Pad. Then they started using analog potentiometers, which let current through based on how much of two metal surfaces are touching each other. Problem there is the metal wears out, gets dirty, or oxidizes. Now they're starting to use Hall sensors and permanent magnets; no degrading!
You are correct todiwan. Conductive materials like metal have an interesting material property where electrons sort of just "float" around in the material and can thus be pushed around within the material (which is why they are conductive) The positive charge is the "absence" of all the electrons (it's positive relative to the more negative side).
It is also often used to measure rotational velocity or rotational position in various things.
If there is something like the teeth on a cog or a shaft with a non uniform cross-section then a Hall effect sensor will give a varying reading as the thing rotates. This can be filtered and counted to give a speed or position. Advantages of this are that it is non contact method and also it continues to work in dirty environments when optical methods might be unsuitable.
Really helpful video Thanks al ot gonna need this for my physics finals
@mcjhn
The origin of the force on the current-carrying wire is the Lorenz force. Each moving electron that makes up the current experiences a Lorenz force, (the force that bends the path of the charge in the video) and the forces on each electron add up to give a net force on the wire which is proportional to the current times the strength of the magnetic field. The force is maximum when the wire lies perpendicular to the magnetic field. The Lorentz force is the common feature.
what a teaching.. Thanks so much sir