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The largest of the specialized branches of electrical engineering, the branch concerned with the electronic computer, was introduced during World War II. The field of computer science and engineering has attracted members of several disciplines outside electronics, notably logicians, linguists, and applied mathematicians.

Another very large field is that concerned with electric light and power and their applications. Specialities within the field include the design, manufacture, and use of turbines, generators, transmission lines, transformers, motors, lighting systems, and appliances.

A third major field is that of communications, which comprises not only telegraphy and telephony but also satellite communications and the transmission of voice and data by laser signals through optical-fibre networks. The communication of digital data among computers connected by wire, microwave, and satellite circuits is now a major enterprise that has built a strong bond between computer and communications specialists.

The applications of electricity and electronics to other fields of science have expanded since World War II. Among the sciences represented are medicine, biology, oceanography, geoscience, nuclear science, laser physics, sonics and ultrasonics, and acoustics. Theoretical specialties within electronics include circuit theory, information theory, radio-wave propagation, and microwave theory.

Another important speciality concerns improvements in materials and components used in electrical and electronics engineering, such as conductive, magnetic, and insulating materials and the semiconductors used in solid-state devices. One of the most active areas is the development of new electronic devices, particularly the integrated circuits used in computers and other digital systems.

The development of electronic systems--equipment for consumers, such as radios, television sets, stereo equipment, video games, and home computers--occupies a large number of engineers. Another field is the application of computers and radio systems to automobiles, ships, and other vehicles. The field of aerospace electronic systems includes navigation aids for aircraft, automatic pilots, altimeters, and radar for traffic control, blind landing, and collision prevention. Many of these devices are also widely used in the marine services.

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