Question

How to calculate the current in a superconductor,anybody knows?Does I=U/R still work?

Answer 1

What about using a magnetic field to get a current?Then does F=EQ and F=MA still work for moving charges in a wire?If those work,then the current I seems to be increasing due to the acceleration of the charges,will it then produce a magnetic field to hold itself back?Is there any equilibrium out there?

Answer 2

Ohm's law if used properly will work. For example there is such thing as negative dynamic resistance which exists in some circuits that can still be dealt with mathematically using Ohm's Law.

Answer 3

Pretty much all I know about superconductors is, they have zero resistance to current flow.
So Ohm's law isn't going to be any use since you would have V divided by zero. I imagine that V, the voltage drop across a superconductor would also be zero so Ohm's law is indeterminate (ie 0/0) and tells you nothing about I.
You'd probably have more luck considering the amount of work done to establish the current, as that energy will be stored in the magnetic field of the current (maybe) : )

Answer 4

Is it zero or almost zero. Has the value of "absolute zero" actually been achieved as far as temperature is concerned? Or has it been close to absolute. Isn't this the temperature where there is no atomic motion? I have heard of superconductors, but none where the resistance is zero. Just the movement of electrons would seem to create some energy thus temperature? If the resistance is actually zero, then as has been pointed out Ohm's law has a mathematical problem. :)

Answer 5

What about using a magnetic field?I'm pretty curious about how to transfer eletronic power using a superconductor wire.

Answer 6

I don't believe we would have a power source that would have an output that exceeds it's input, As soon as work is accomplished, I would bet their would be some resistance developed that would only at best be result in 100% efficiency, not above 100%.

Answer 7

@AndrewLee @radar @ProfBrainstorm

see http://physics.stackexchange.com/questions/62664/how-can-ohms-law-be-correct-if-superconductors-have-0-resistivity

Answer 8

Also see http://en.wikipedia.org/wiki/Superconductivity

for a more detailed explanation of superconductivity and ohms law.

Answer 9

Thanks for the informative link. I don't believe this technology will violate the Conservation of Energy or Matter Laws.

Answer 10

http://openstudy.com/study#/updates/540ddec2e4b0d8ead1beb7c5
can someone please help me become a fan and give you a metal :)

Answer 11

@teenwolfie if you choose to award a medal, all you need to do is to click on the box labeled "best response" located on the upper right hand of the individuals post.

Answer 12

@gleem @radar @ProfBrainstorm,THANK U GUYS,your answers give me a whole new idea of Ohm's law and superconductivity.:)