I teach high school physics. Here's my notes/textbook on electricity with simulations and equations rendered in LaTex. https://landgreen.github.io/physics/notes/circuits/electrici...
This is amazing ! Really well put together!
What Is Electricity? (2013)
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Re: What Is Electricity? (2013)
#12It's interesting to me when I read it. We take it down to the proton neutron and electron stating they are charged with positive negative or neutral charge.... but what are they charged with ?
Electricity ? What is it made of ?
Re: What Is Electricity? (2013)
#13I teach high school physics. Here's my notes/textbook on electricity with simulations and equations rendered in LaTex. https://landgreen.github.io/physics/notes/circuits/electrici...
Awesome notes. I haven't had my coffee yet so perhaps I'm just misreading this part:
"In 1746 Benjamin Franklin mistakenly assigned a negative value to the charge carriers that we now call electrons."
Shouldn't that read "mistakenly assigned a _positive_ value to the charge carriers that we now call electrons"?
Re: What Is Electricity? (2013)
#14Wait, what????? Generators don't generate electricity from nothing????? It's all been a scam????? Say it ain't so!
Re: What Is Electricity? (2013)
#15I teach high school physics. Here's my notes/textbook on electricity with simulations and equations rendered in LaTex. https://landgreen.github.io/physics/notes/circuits/electrici...
Awesome notes. I haven't had my coffee yet so perhaps I'm just misreading this part: "In 1746 Benjamin Franklin mistakenly assigned a negative value to the charge carriers that we now call electrons." Shouldn't that read "mistakenly assigned a _positive_ value to the charge carriers that we now call electrons"?
Nope! It's kinda silly. We all call electrons negative because of how they were labeled 250 years ago. If he had labeled them positive the math involving electric current would be a bit easier.
Re: What Is Electricity? (2013)
#16It's interesting to me when I read it. We take it down to the proton neutron and electron stating they are charged with positive negative or neutral charge.... but what are they charged with ? Electricity ? What is it made of ?
It's made of the electromagnetic force. We can measure it and characterize it very accurately with mathematics. We can say what it isn't (gravity or the weak force or the strong force), but we cannot say what the electromagnetic force is. Sorry. If you figure it out you'll get a Nobel Prize.
Re: What Is Electricity? (2013)
#17One aspect of electricity I think is useful to emphasize is that electrons in a conductor move more like the steel balls Newton's cradle (that toy you may have seen where a ball strikes one end of a line of balls, and nothing moves except the end ball, or you can pull back two balls and then only two balls will move, and so on). This can help with intuition about the distinction between "holes" and electrons, and how…
Here's my take on a cartoony conductivity simulation. I've got three models: conductors, semiconductors, and semiconductors but with holes. https://landgreen.github.io/physics/notes/electromagnetism/c...
I like these diagrams. Now I want to see what superconductivity looks like in your framework. An unimpeded stream of electrons flowing as if the red dots aren't even there?
Re: What Is Electricity? (2013)
#18Earlier quoted context omitted.
Here's my take on a cartoony conductivity simulation. I've got three models: conductors, semiconductors, and semiconductors but with holes. https://landgreen.github.io/physics/notes/electromagnetism/c...
I like these diagrams. Now I want to see what superconductivity looks like in your framework. An unimpeded stream of electrons flowing as if the red dots aren't even there?
My simulation just runs classical physics (Coulomb's law + Newton's laws). It's missing any mechanism for super conductivity. Although, I could just turn off friction.
I think superconductivity means the electrons pair up and stop colliding through the Pauli exclusion principle. I didn't code any collisions, so maybe it's already modeling a crappy version of superconductivity!
Re: What Is Electricity? (2013)
#19Earlier quoted context omitted.
Awesome notes. I haven't had my coffee yet so perhaps I'm just misreading this part: "In 1746 Benjamin Franklin mistakenly assigned a negative value to the charge carriers that we now call electrons." Shouldn't that read "mistakenly assigned a _positive_ value to the charge carriers that we now call electrons"?
Nope! It's kinda silly. We all call electrons negative because of how they were labeled 250 years ago. If he had labeled them positive the math involving electric current would be a bit easier. https://xkcd.com/567/
Or 250 years from now... ;-)
Re: What Is Electricity? (2013)
#20Just amazing! Imagine all the physics and knowledge from multiple sciences, disciplines and fields are used when someone tells Amazon Echo to turn on a charger or socket that’s connected to a phone or laptop. Echo -> ISP wires —> Undersea Cables —> Amazon Servers -> Back home -> Electricity flow And this is so super high level All of these devices on the way are powered by electricity from dams, solar, wind etc. Befo…
Quite fascinating and mind-boggling. What really blows my mind is that technology is still extraordinarily less complicated than (bi|ec)ology.