Final answer:
A device with very low resistance is known as a superconductor, which conducts electricity with zero resistance, allowing for energy lossless electricity transmission and having applications in many fields.
Step-by-step explanation:
A device with very low resistance is known as a superconductor. Superconductors are materials that can conduct electricity with zero electrical resistance, which means that they allow the flow of electricity without any energy loss. The phenomenon of superconductivity occurs under certain conditions, usually at very low temperatures.
Resistance in materials ranges significantly. For example, insulators can have very high resistances, whereas conductors have very low resistances. Superconductors are at the extreme end of this range, where their resistance drops to zero when they are cooled below a certain critical temperature. This property allows for efficient energy transmission and has applications in various fields, including medical imaging and electrical power distribution.
Importance of Superconductors
The absence of electrical resistance in superconductors leads to no energy loss during the transmission, which could greatly reduce the cost of electricity and enhance the performance of electrical systems. They also exhibit another interesting property called the Meissner effect, where they repel magnetic fields when in the superconducting state.