Electrical Engineering
Electricity and Magnetism

What is a superconductor?

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2017-01-31 03:52:20

A material is said to be a superconductor if when it is brought

down to a critical low temperature it loses its resistivity



A superconductor is a material that has zero electrical

resistance at certain temperatures. For example, in a ring of

superconducting material, if you induce a current to flow in a

circle, it will continue flowing for ever. So far, it has only been

possible to create superconductors at cryogenic (i.e., "supercold")



Superconductivity is a property of a substance at a given

temperature, not of a substance at any temperature.

Superconductors are things that have no electrical resistance

when they are at low enough temperatures, typically close to

absolute zero i.e. 0 Kelvin or about -273 degrees C.

There are also 'high-temperature' superconductors that operate

at about 70 degrees K (-203 degrees C).

We haven't yet found a substance that works as a superconductor

at room temperature there is a lot of research on-going. The aim is

to try to find metal alloys or other substances that will behave as

superconductors at temperatures which are much closer to room

temperature than to absolute zero i.e. 0 Kelvin or about -273

degrees C.

A conductor that allows electricity to flow easily ~APEX

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