Reference direction of electrical current in teaching/books

Jun 20, 2009 55 Replies

Very cool. The protons (H nuclei) actually jump between molecules to carry charge.

Water and ice are amazing things. Both are essentially black in the thermal IR, which can be handy.

Now that's an interesting idea. Ice is a pretty good insulator, but I don't know if some doped ice allotrope can be a semiconductor. It wouldn't be real hard to try some cases. You could make a diode or a transistor by changing water or vapor impurities while freezing a layer onto a surface.

John

"Protons" is also plural, so the sentence is consistent.

And this ain't alt.english.usage, either. JF attacks the English when he has no basis for evaluating substance. He's just in a bad mood.

John

Whatever you think that means. Elemental hydrogen has but a single proton in its nucleus, so "protons" is wrong. >> > >And this ain\'t alt.english.usage, either. JF attacks the English when >he has no basis for evaluating substance. He\'s just in a bad mood. > >John JF

It means that there is nothing wrong with the statement that you objected to.

There *is* more than one hydrogen atom in the universe.

I actually own several of them.

John

Water you talking about, John? ;-)

You can\'t have a sense of humor, if you have no sense!

Nah, you're just borrowing them. Have another beer...

Hydrogen doesn't give you much to work with, you know! ;-)

You can\'t have a sense of humor, if you have no sense!

So, in, say, a zinc-carbon cell, the carbon is the cathode and the zinc is the anode? ?:-/

Thanks, Rich

Since holes are actually nothing, they're not deflected by a magnetic field? ;-)

Thanks, Rich

It wouldn't have a very good temperature range...

;-) Rich

Obviously it's the electrons which are actually moving, hopping from hole to hole.

But somehow, in a p-type semiconductor, they end up getting deflected in the *opposite* direction to what you would expect from their charge and direction of motion and the magnetic field direction.

That's the part for which I've yet to see an explanation aimed at people who aren't steeped in quantum theory.

Greg

It's a moot point as to whether they own you ;-)

"Electricity is of two kinds, positive and negative. The difference is, I presume, that one comes a little more expensive, but is more durable; the other is a cheaper thing, but the moths get into it." (Stephen Leacock)

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