Yes, the electricity flows on the outside of wire, now add that knowledge to a circuit, and you see that the electricity flows in between the wires. kinda an oval, encompassing both wires.
We are pretty sure that it is resistance that causes light bulbs and heaters to glow. At least we can measure it as ohms. But, what really is that? Why is some material ohmic, and some material non-conductive, and other material super-conductive? That last one is really weird if it is indeed electrons (as particles) running through there.
I think it's best not to get too deep into what it is because the smaller it gets the weirder it is.
As you say ohms is the measurement of resistance. Everything gives some resistance but others give very little to the point we say it's non existent or not applicable. But there is "some" even if it's very very very very little of it. Basically zero.
Why is some conductive and others super conductive?
Lol, like I said electricity is stramge. Everything is held together by electricity. Then again, as scientist Nassim H. revealed to us, that there is only one electron in the entire universe, makes me wonder why the electricity? What is electricity anyways? An after effect of that one electron traveling everywhere at the same time? I don't know. Even top scientist are baffled by what it truly is.
What makes something conductive?
In electricity, it is the current or amount of electricity flowing through per second. When one says it's super conductive, it means that the ions in said material has a higher capacity to pass electrical current from one to another of similar resistance.
This may shed some more light to it, I find it to be accurate:
https://www.britannica.com/science/conductivity
Good thing we have webby. Plenty of information out there. And plenty of videos explaining it too. I even catch myself watching a few about such trivial things to the date.
My main focus at the moment is finding free energy mechanism that I can afford to build on my own. A Tesla coil seems fun to do but can be rather real dangerous if done incorrectly as it has probability of extreme high voltages. The most I have had flow through me 1200volts. That was major scare lol. It's not so bad but if it was amps i wouldn't be telling you all of this today.
Trust Britannica to give you all the Modern Materialistic palp.
Yes, i have learned all that shit through years/decades of college.
The phone company runs on 42 volts. They have a giant battery bank.
With a copper bar on one wall for positive, and a copper bar on the other wall for negative, so you cannot touch both at the same time.
One technician had his face melted off because his wire rim glasses fell off his face.
It isn't really volts or amps, it is power potential.
A Tesla coil is a very high voltage, very high frequency transformer.
If all is done correctly, it doesn't hurt at all. It goes around the body.
The problem comes in when you don't get everything in balance, and you get some low frequency stuff going through. And still, it is not usually bad, just irritating. Get good plans and do your best to follow them.