A super conductor conducts or moves electricity from one place to another without out losing any energy in the process. Only certain materials can be used in this way and usually they only work below a certain temperature. Most materials used as conductors do produce some resistance and thus are not as efficient. For more information about these materials check the link below.
As a practical application, power companies are hoping to develop superconductor-based transformers to transform electric current in optimally efficient ways, as superconductors lose no heat while they conduct energy. At a molecular level, this occurs beause superconductive electrons are able to move through a conductor’s atomic lattice (molecular structure) without bumping into other molecules, causing friction and generating heat as a wasted form of energy. How they actually move in this way (as opposed to semi-conductive electrons) is not fully understood.
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