A cable is generally considered to be a conductor made of one or more insulated conductors that are insulated from each other to transmit power or information from one location to another. Broadly speaking, it refers to a device that uses metal as a medium to transmit electrical signals.
By definition, the cable is used to conduct electricity. Generally made of the following metals:
Copper is second only to silver in electrical conductivity, and its thermal conductivity is second only to gold and silver. It is corrosion-resistant, non-magnetic, plastic, easy to weld, and has a wide range of uses. Copper alloys mainly improve the wear resistance, corrosion resistance and mechanical properties of copper.
Silver, metal has the highest conductivity and thermal conductivity, has good corrosion resistance and oxidation resistance, and is easy to weld; mainly used for plating and cladding;
Gold, nickel, used as a high temperature resistant wire.
Iron (steel), often used as a reinforcing material for composite conductors, such as steel core aluminum wire, copper clad steel, aluminum clad steel wire and so on.
Zinc is used as a coating for steel/steel strip/iron conductors to prevent corrosion.
Tin, used as a wire/copper wire coating to prevent corrosion and facilitate copper wire bonding.
Optical fiber is the abbreviation of optical fiber, which is a light-conducting tool realized by the principle of total reflection of light in fibers made of glass or plastic. Former Hong Kong Chinese University President Gao Wei and George A. Hockham first proposed the idea that fiber can be used for communication transmission, so Gao Hao won the 2009 Nobel Prize in Physics.
The emitting device at one end of the optical fiber transmits a light pulse to the optical fiber using a light emitting diode (LED) or a laser beam, and the receiving device at the other end of the optical fiber detects the pulse using the photosensitive member.
In daily life, fiber is used as a long-distance information transmission because the conduction loss of light in the optical fiber is much lower than that of electricity conduction in the wire.