Scribd
Upload
18 views7 pages

Lec No.04

Superconductors exhibit zero electrical resistance below a critical temperature, allowing current to flow indefinitely without a power source. They have significant applications in powerful electromagnets for MRI machines, digital circuits, and potential future uses in smart grids and electric motors. However, their sensitivity to moving magnetic fields poses challenges for certain applications, particularly those using alternating current.

Uploaded by

multanimunda00007
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
18 views7 pages

Lec No.04

Superconductors exhibit zero electrical resistance below a critical temperature, allowing current to flow indefinitely without a power source. They have significant applications in powerful electromagnets for MRI machines, digital circuits, and potential future uses in smart grids and electric motors. However, their sensitivity to moving magnetic fields poses challenges for certain applications, particularly those using alternating current.

Uploaded by

multanimunda00007
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 7

Lecture # 4

SUPER CONDUCTORS
 The electrical resistivity of a
metallic conductor decreases gradually as
temperature is lowered and at the same time its
conductivity becomes infinite. Thus a current in a
superconductor flows without any change in
magnitude
 In ordinary conductors, such as copper or silver, this
decrease is limited by impurities and other defects.
Even near absolute zero, a real sample of a normal
conductor shows some resistance.
 In a superconductor, the resistance drops abruptly
to zero when the material is cooled below its critical
temperature. An electric current flowing through a
loop of superconducting wire can persist indefinitely
with no power source
 The complete ejection of magnetic field lines from
the interior of the superconductor as it transitions
into the superconducting state
Applications

 Superconducting magnets are some of the most


powerful electromagnets known. They are used
in MRI(Magnetic Resonance
Imaging)/NMR(Nuclear Magnetic
Resonance) machines, mass spectrometers, and the
beam-steering magnets used in particle accelerators.
They can also be used for magnetic separation,
where weakly magnetic particles are extracted from a
background of less or non-magnetic particles, as in
the pigment industries.
Applications of Super Conductors

 In the 1950s and 1960s, superconductors were used


to build experimental digital computers
using cryotron switches. More recently,
superconductors have been used to make digital
circuits based on rapid single flux
quantum technology and RF and microwave
filters for mobile phone base stations.
Future Applications

 Promising future applications include high-


performance smart grid, electric power
transmission, transformers, power storage
devices, electric motors (e.g. for vehicle propulsion, as
in vactrains or maglev trains), magnetic levitation
devices, fault current limiters, nanoscopic materials such
as buckyballs, nanotubes, composite materials and
superconducting magnetic refrigeration. However,
superconductivity is sensitive to moving magnetic fields
so applications that use alternating current (e.g.
transformers) will be more difficult to develop than those
that rely upon direct current.

You might also like