Nikola Tesla worked on telecommunication technology in the US.
Electrical engineering . Electrical engineering has now subdivided into a wide range of subfields including electronics , digital computers , power engineering , telecommunications , control systems , radio-frequency engineering , signal processing , instrumentation , and microelectronics . Nikola Tesla . Tesla tried to put these ideas to practical use in his unfinished Wardenclyffe Tower project , an intercontinental wireless communication and power transmitter , but ran out of funding before he could complete it . Wireless communication , or sometimes simply wireless , is the transfer of information or power between two or more points that are not connected by an electrical conductor . It encompasses various types of fixed , mobile , and portable applications , including two-way radios , cellular telephones , personal digital assistants ( PDAs ) , and wireless networking . The term is commonly used in the telecommunications industry to refer to telecommunications systems ( e.g. radio transmitters and receivers , remote controls , etc. ) which use some form of energy ( e.g. radio waves , acoustic energy , ) to transfer information without the use of wires .