The World Copper Factbook 2019 International Copper Study Group 45 Major Uses of Copper Electronics and Communications Copp er plays a key role in worldwide infor m ation and communications technologies HDSL High Digita l Subscr ibe r Line and ADSL A s y mm e t ri cal Digital Subscriber Line techno log y allows for hig h speed data transmission including inte rne t service th r o u g h th e existing co ppe r infra s truct u re of ordinary tele pho ne wire Copper and copper allo y pro d ucts are used in do mestic subscriber lines wide and lo cal area networks mobile pho nes and per s ona l compute r s Semico nductor manufact u rer s have launched a revolutio n ary copper chip By using copper for circuitry in silicon chips micro p roc e ssors are able to operate at hig h er speeds us ing less energy Coppe r heat sink s help remove heat from tra n sisto r s and keep computer processo rs operating at peak efficienc y Copper is also use d extensively in other electr on i c equipment in th e form of wires tra n sformers connectors and sw itches Images co urte sy of th e Co p p e r Developme n t Association and Euro pea n Copper Institute