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Electrical engineering

Electrical engineers design complex power systems ...
... and electronic circuits.

Electrical engineering is a field of engineering that generally deals with the study and application of electricity, electronics, and electromagnetism. This field first became an identifiable occupation in the latter half of the 19th century after commercialization of the electric telegraph, the telephone, and electric power distribution and use. Subsequently, broadcasting and recording media made electronics part of daily life. The invention of the transistor and, subsequently, the integrated circuit brought down the cost of electronics to the point where they can be used in almost any household object.

Electrical engineering has now subdivided into a wide range of subfields including electronics, digital computers, power engineering, telecommunications, control systems, RF engineering, signal processing, instrumentation, and microelectronics. The subject of electronic engineering is often treated as its own subfield but it intersects with all the other subfields, including the power electronics of power engineering.

Electrical engineers typically hold a degree in electrical engineering or electronic engineering. Practicing engineers may have professional certification and be members of a professional body. Such bodies include the Institute of Electrical and Electronic Engineers (IEEE) and the Institution of Engineering and Technology (IET).

Electrical engineers work in a very wide range of industries and the skills required are likewise variable. These range from basic circuit theory to the management skills required of project manager. The tools and equipment that an individual engineer may need are similarly variable, ranging from a simple voltmeter to a top end analyzer to sophisticated design and manufacturing software.

Contents

  • History 1
    • 19th century 1.1
    • More modern developments 1.2
    • Solid-state transistors 1.3
  • Subdisciplines 2
    • Power 2.1
    • Control 2.2
    • Electronics 2.3
    • Microelectronics 2.4
    • Signal processing 2.5
    • Telecommunications 2.6
    • Instrumentation 2.7
    • Computers 2.8
    • Related disciplines 2.9
  • Education 3
  • Practicing engineers 4
  • Tools and work 5
  • See also 6
  • Notes 7
  • References 8
  • Further reading 9
  • External links 10

History

Electricity has been a subject of scientific interest since at least the early 17th century. The first electrical engineer was probably William Gilbert who designed the versorium: a device that detected the presence of statically charged objects. He was also the first to draw a clear distinction between magnetism and static electricity and is credited with establishing the term electricity.[1] In 1775 Alessandro Volta's scientific experimentations devised the electrophorus, a device that produced a static electric charge, and by 1800 Volta developed the voltaic pile, a forerunner of the electric battery.[2]

19th century

The discoveries of Michael Faraday formed the foundation of electric motor technology.

However, it was not until the 19th century that research into the subject started to intensify. Notable developments in this century include the work of electric current and potential difference in a conductor, Michael Faraday, the discoverer of electromagnetic induction in 1831, and James Clerk Maxwell, who in 1873 published a unified theory of electricity and magnetism in his treatise Electricity and Magnetism.[3]

Beginning in the 1830s, efforts were made to apply electricity to practical use in the telegraph. By the end of the 19th century the world had been forever changed by the rapid communication made possible by engineering development of land-lines, submarine cables, and, from about 1890, wireless telegraphy.

Practical applications and advances in such fields created an increasing need for standardized units of measure. They led to the international standardization of the units volt, ampere, coulomb, ohm, farad, and henry. This was achieved at an international conference in Chicago 1893.[4] The publication of these standards formed the basis of future advances in standardisation in various industries, and in many countries the definitions were immediately recognised in relevant legislation.[5]

During these years, the study of electricity was largely considered to be a subfield of Atlanta, Georgia.

During these decades use of electrical engineering increased dramatically. In 1882,

  • International Electrotechnical Commission (IEC)
  • MIT OpenCourseWare in-depth look at Electrical Engineering - online courses with video lectures.
  • IEEE Global History Network A wiki-based site with many resources about the history of IEEE, its members, their professions and electrical and informational technologies and sciences.
  • Telephone Workshops An Introduction to Electrical Engineering for Children

External links

  • Adhami, Reza; Meenen, Peter M.; Hite, Denis (2007). Fundamental Concepts in Electrical and Computer Engineering with Practical Design Problems. Universal-Publishers.  
  • Bober, William; Stevens, Andrew (27 August 2012). Numerical and Analytical Methods with MATLAB for Electrical Engineers. CRC Press.  
  • Bobrow, Leonard S. (1996). Fundamentals of Electrical Engineering. Oxford University Press.  
  • Chen, Wai Kai (16 November 2004). The Electrical Engineering Handbook. Academic Press.  
  • Ciuprina, G.; Ioan, D. (30 May 2007). Scientific Computing in Electrical Engineering. Springer.  
  • Faria, J. A. Brandao (15 September 2008). Electromagnetic Foundations of Electrical Engineering. John Wiley & Sons.  
  • Jones, Lincoln D. (July 2004). Electrical Engineering: Problems and Solutions. Dearborn Trade Publishing.  
  • Karalis, Edward (18 September 2003). 350 Solved Electrical Engineering Problems. Dearborn Trade Publishing.  
  • Krawczyk, Andrzej; Wiak, S. (1 January 2002). Electromagnetic Fields in Electrical Engineering. IOS Press.  
  • Laplante, Phillip A. (31 December 1999). Comprehensive Dictionary of Electrical Engineering. Springer.  
  • Leon-Garcia, Alberto (2008). Probability, Statistics, and Random Processes for Electrical Engineering. Prentice Hall.  
  • Malaric, Roman (2011). Instrumentation and Measurement in Electrical Engineering. Universal-Publishers.  
  • Sahay, Kuldeep; Sahay, Shivendra Pathak, Kuldeep (1 January 2006). Basic Concepts of Electrical Engineering. New Age International.  
  • Srinivas, Kn (1 January 2007). Basic Electrical Engineering. I. K. International Pvt Ltd.  

Further reading

  • Abramson, Albert (1955). Electronic Motion Pictures: A History of the Television Camera. University of California Press. 
  • Bayoumi, Magdy A.; Swartzlander, Earl E. (31 October 1994). VLSI Signal Processing Technology. Springer.  
  • Bhushan, Bharat (1997). Micro/Nanotribology and Its Applications. Springer.  
  • Bissell, Chris (25 July 1996). Control Engineering, 2nd Edition. CRC Press.  
  • Chandrasekhar, Thomas (1 December 2006). Analog Communication (Jntu). Tata McGraw-Hill Education.  
  • Chaturvedi, Pradeep (1997). Sustainable Energy Supply in Asia: Proceedings of the International Conference, Asia Energy Vision 2020, Organised by the Indian Member Committee, World Energy Council Under the Institution of Engineers (India), During November 15-17, 1996 at New Delhi. Concept Publishing Company.  
  • Dodds, Christopher; Kumar, Chandra; Veering, Bernadette (March 2014). Oxford Textbook of Anaesthesia for the Elderly Patient. Oxford University Press.  
  • Fairman, Frederick Walker (11 June 1998). Linear Control Theory: The State Space Approach. John Wiley & Sons.  
  • Fredlund, D. G.; Rahardjo, H.; Fredlund, M. D. (30 July 2012). Unsaturated Soil Mechanics in Engineering Practice. Wiley.  
  • Grant, Malcolm Alister; Bixley, Paul F (1 April 2011). Geothermal Reservoir Engineering. Academic Press.  
  • Grigsby, Leonard L. (16 May 2012). Electric Power Generation, Transmission, and Distribution, Third Edition. CRC Press.  
  • Heertje, Arnold; Perlman, Mark (1990). Evolving technology and market structure: studies in Schumpeterian economics. University of Michigan Press.  
  • Huurdeman, Anton A. (31 July 2003). The Worldwide History of Telecommunications. John Wiley & Sons.  
  • Iga, Kenichi; Kokubun, Yasuo (12 December 2010). Encyclopedic Handbook of Integrated Optics. CRC Press.  
  • Jalote, Pankaj (31 January 2006). An Integrated Approach to Software Engineering. Springer.  
  • Khanna, Vinod Kumar (1 January 2009). Digital Signal Processing. S. Chand.  
  • Lambourne, Robert J. A. (1 June 2010). Relativity, Gravitation and Cosmology. Cambridge University Press.  
  • Leitgeb, Norbert (6 May 2010). Safety of Electromedical Devices: Law - Risks - Opportunities. Springer.  
  • Leondes, Cornelius T. (8 August 2000). Energy and Power Systems. CRC Press.  
  • Mahalik, Nitaigour Premchand (2003). Mechatronics: Principles, Concepts and Applications. Tata McGraw-Hill Education.  
  • Maluf, Nadim; Williams, Kirt (1 January 2004). Introduction to Microelectromechanical Systems Engineering. Artech House.  
  • Manolakis, Dimitris G.; Ingle, Vinay K. (21 November 2011). Applied Digital Signal Processing: Theory and Practice. Cambridge University Press.  
  • Martini, L., "BSCCO-2233 multilayered conductors", in Superconducting Materials for High Energy Colliders, pp. 173–181, World Scientific, 2001 ISBN 981-02-4319-7.
  • Martinsen, Orjan G.; Grimnes, Sverre (29 August 2011). Bioimpedance and Bioelectricity Basics. Academic Press.  
  • McDavid, Richard A.; Echaore-McDavid, Susan (1 January 2009). Career Opportunities in Engineering. Infobase Publishing.  
  • Merhari, Lhadi (3 March 2009). Hybrid Nanocomposites for Nanotechnology: Electronic, Optical, Magnetic and Biomedical Applications. Springer.  
  • Mook, William Moyer (2008). The Mechanical Response of Common Nanoscale Contact Geometries. ProQuest.  
  • Naidu, S. M.; Kamaraju, V. (2009). High Voltage Engineering. Tata McGraw-Hill Education.  
  • Obaidat, Mohammad S.; Denko, Mieso; Woungang, Isaac (9 June 2011). Pervasive Computing and Networking. John Wiley & Sons.  
  • Rosenberg, Chaim M. (2008). America at the Fair: Chicago's 1893 World's Columbian Exposition. Arcadia Publishing.  
  • Schmidt, Rüdiger, "The LHC accelerator and its challenges", in Kramer M.; Soler, F.J.P. (eds), Large Hadron Collider Phenomenology, pp. 217–250, CRC Press, 2004 ISBN 0-7503-0986-5.
  • Severs, Jeffrey; Leise, Christopher (24 February 2011). Pynchon's Against the Day: A Corrupted Pilgrim's Guide. Lexington Books.  
  • Shetty, Devdas; Kolk, Richard (14 September 2010). Mechatronics System Design, SI Version. Cengage Learning.  
  • Smith, Brian W. (January 2007). Communication Structures. Thomas Telford.  
  • Sullivan, Dennis M. (24 January 2012). Quantum Mechanics for Electrical Engineers. John Wiley & Sons.  
  • Taylor, Allan (2008). Energy Industry. Infobase Publishing.  
  • Thompson, Marc (12 June 2006). Intuitive Analog Circuit Design. Newnes.  
  • Tobin, Paul (1 January 2007). PSpice for Digital Communications Engineering. Morgan & Claypool Publishers.  
  • Tunbridge, Paul (1992). Lord Kelvin, His Influence on Electrical Measurements and Units. IET.  
  • Tuzlukov, Vyacheslav (12 December 2010). Signal Processing Noise. CRC Press.  
  • Walker, Denise (2007). Metals and Non-metals. Evans Brothers.  
  • Wildes, Karl L.; Lindgren, Nilo A. (1 January 1985). A Century of Electrical Engineering and Computer Science at MIT, 1882–1982. MIT Press.  
  • Zhang, Yan; Hu, Honglin; Luo, Jijun (27 June 2007). Distributed Antenna Systems: Open Architecture for Future Wireless Communications. CRC Press.  
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References

Note I - There were around 300,000 people (as of 2006) working as electrical engineers in the US; in Australia, there were around 17,000 (as of 2008) and in Canada, there were around 37,000 (as of 2007), constituting about 0.2% of the labour force in each of the three countries. Australia and Canada reported that 96% and 88% of their electrical engineers respectively are male.[77]

Notes

See also

Electrical engineering has an intimate relationship with the physical sciences. For instance the physicist Lord Kelvin played a major role in the engineering of the first transatlantic telegraph cable.[73] Conversely, the engineer Oliver Heaviside produced major work on the mathematics of transmission on telegraph cables.[74] Electrical engineers are often required on major science projects. For instance, large particle accelerators such as CERN need electrical engineers to deal with many aspects of the project: from the power distribution, to the instrumentation, to the manufacture and installation of the superconducting electromagnets.[75][76]

The workplaces of electrical engineers are just as varied as the types of work they do. Electrical engineers may be found in the pristine lab environment of a fabrication plant, the offices of a consulting firm or on site at a mine. During their working life, electrical engineers may find themselves supervising a wide range of individuals including scientists, electricians, computer programmers and other engineers.[72]

For many engineers, technical work accounts for only a fraction of the work they do. A lot of time may also be spent on tasks such as discussing proposals with clients, preparing budgets and determining project schedules.[71] Many senior engineers manage a team of technicians or other engineers and for this reason project management skills are important. Most engineering projects involve some form of documentation and strong written communication skills are therefore very important.

Radome at the Misawa Air Base Misawa Security Operations Center, Misawa, Japan

A wide range of instrumentation is used by electrical engineers. For simple control circuits and alarms, a basic multimeter measuring voltage, current and resistance may suffice. Where time-varying signals need to be studied, the oscilloscope is also an ubiquitous instrument. In RF engineering and high frequency telecommunications spectrum analyzers and network analyzers are used. In some disciplines safety can be a particular concern with instrumentation. For instance medical electronics designers must take into account that much lower voltages than normal can be dangerous when electrodes are directly in contact with internal body fluids.[69] Power transmission engineering also has great safety concerns due to the high voltages used; although voltmeters may in principle be similar to their low voltage equivalents, safety and calibration issues make them very different.[70] Many disciplines of electrical engineering use tests specific to their discipline. Audio electronics engineers use audio test sets consisting of a signal generator and a meter, principally to measure level but also other parameters such as harmonic distortion and noise. Likewise information technology have their own test sets, often specific to a particular data format, and the same is true of television broadcasting.

A laser bouncing down an acrylic rod, illustrating the total internal reflection of light in a multi-mode optical fiber.

Although most electrical engineers will understand basic circuit theory (that is the interactions of elements such as resistors, capacitors, diodes, transistors and inductors in a circuit), the theories employed by engineers generally depend upon the work they do. For example, quantum mechanics and solid state physics might be relevant to an engineer working on VLSI (the design of integrated circuits), but are largely irrelevant to engineers working with macroscopic electrical systems. Even circuit theory may not be relevant to a person designing telecommunication systems that use off-the-shelf components. Perhaps the most important technical skills for electrical engineers are reflected in university programs, which emphasize strong numerical skills, computer literacy and the ability to understand the technical language and concepts that relate to electrical engineering.[68]

The Shadow robot hand system

Fundamental to the discipline are the sciences of physics and mathematics as these help to obtain both a qualitative and quantitative description of how such systems will work. Today most engineering work involves the use of computers and it is commonplace to use computer-aided design programs when designing electrical systems. Nevertheless, the ability to sketch ideas is still invaluable for quickly communicating with others.

Satellite communications is typical of what electrical engineers work on.

From the Global Positioning System to electric power generation, electrical engineers have contributed to the development of a wide range of technologies. They design, develop, test and supervise the deployment of electrical systems and electronic devices. For example, they may work on the design of telecommunication systems, the operation of electric power stations, the lighting and wiring of buildings, the design of household appliances or the electrical control of industrial machinery.[67]

Tools and work

In Australia, Canada and the United States electrical engineers make up around 0.25% of the labor force (see note). Outside of Europe and North America, engineering graduates per-capita, and hence probably electrical engineering graduates also, are most numerous in Taiwan, Japan, and South Korea.[66]

Professional bodies of note for electrical engineers include the Institute of Electrical and Electronics Engineers (IEEE) and the Institution of Engineering and Technology (IET). The IEEE claims to produce 30% of the world's literature in electrical engineering, has over 360,000 members worldwide and holds over 3,000 conferences annually.[62] The IET publishes 21 journals, has a worldwide membership of over 150,000, and claims to be the largest professional engineering society in Europe.[63][64] Obsolescence of technical skills is a serious concern for electrical engineers. Membership and participation in technical societies, regular reviews of periodicals in the field and a habit of continued learning are therefore essential to maintaining proficiency. MIET(Member of the Institution of Engineering and Technology) is recognised in Europe as Electrical and computer (technology) engineer.[65]

The advantages of certification vary depending upon location. For example, in the United States and Canada "only a licensed engineer may seal engineering work for public and private clients".[59] This requirement is enforced by state and provincial legislation such as contract law. In cases where an engineer's work fails he or she may be subject to the tort of negligence and, in extreme cases, the charge of criminal negligence. An engineer's work must also comply with numerous other rules and regulations such as building codes and legislation pertaining to environmental law.

The IEEE corporate office is on the 17th floor of 3 Park Avenue in New York City

In most countries, a Bachelor's degree in engineering represents the first step towards professional certification and the degree program itself is certified by a professional body.[58] After completing a certified degree program the engineer must satisfy a range of requirements (including work experience requirements) before being certified. Once certified the engineer is designated the title of Professional Engineer (in the United States, Canada and South Africa), Chartered Engineer or Incorporated Engineer (in India, Pakistan, the United Kingdom, Ireland and Zimbabwe), Chartered Professional Engineer (in Australia and New Zealand) or European Engineer (in much of the European Union).

Belgian electrical engineers inspecting the rotor of a 40,000 kilowatt turbine of the General Electric Company in New York City

Practicing engineers

Some electrical engineers choose to study for a postgraduate degree such as a Master of Engineering/Master of Science (M.Eng./M.Sc.), a Master of Engineering Management, a Doctor of Philosophy (Ph.D.) in Engineering, an Engineering Doctorate (Eng.D.), or an Engineer's degree. The master's and engineer's degrees may consist of either research, coursework or a mixture of the two. The Doctor of Philosophy and Engineering Doctorate degrees consist of a significant research component and are often viewed as the entry point to academia. In the United Kingdom and some other European countries, Master of Engineering is often considered to be an undergraduate degree of slightly longer duration than the Bachelor of Engineering rather than postgraduate.[57]

At many schools, electronic engineering is included as part of an electrical award, sometimes explicitly, such as a Bachelor of Engineering (Electrical and Electronic), but in others electrical and electronic engineering are both considered to be sufficiently broad and complex that separate degrees are offered.[56]

Electrical engineers typically possess an academic degree with a major in electrical engineering, electronics engineering, electrical engineering technology,[52] or electrical and electronic engineering.[53][54] The same fundamental principles are taught in all programs, though emphasis may vary according to title. The length of study for such a degree is usually four or five years and the completed degree may be designated as a Bachelor of Science in Electrical/Electronics Engineering Technology, Bachelor of Engineering, Bachelor of Science, Bachelor of Technology, or Bachelor of Applied Science depending on the university. The bachelor's degree generally includes units covering physics, mathematics, computer science, project management, and a variety of topics in electrical engineering.[55] Initially such topics cover most, if not all, of the subdisciplines of electrical engineering. At some schools, the students can then choose to emphasize one or more subdisciplines towards the end of their courses of study.

Education

Aerospace engineering and robotics an example is the most recent electric propulsion and ion propulsion.

Biomedical engineering is another related discipline, concerned with the design of medical equipment. This includes fixed equipment such as ventilators, MRI scanners[51] and electrocardiograph monitors as well as mobile equipment such as cochlear implants, artificial pacemakers and artificial hearts.

The term mechatronics is typically used to refer to macroscopic systems but futurists have predicted the emergence of very small electromechanical devices. Already such small devices, known as Microelectromechanical systems (MEMS), are used in automobiles to tell airbags when to deploy,[49] in digital projectors to create sharper images and in inkjet printers to create nozzles for high definition printing. In the future it is hoped the devices will help build tiny implantable medical devices and improve optical communication.[50]

Mechatronics is an engineering discipline which deals with the convergence of electrical and mechanical systems. Such combined systems are known as electromechanical systems and have widespread adoption. Examples include automated manufacturing systems,[46] heating, ventilation and air-conditioning systems[47] and various subsystems of aircraft and automobiles. [48]

The Bird VIP Infant ventilator

Related disciplines

Computer engineering deals with the design of computers and computer systems. This may involve the design of new hardware, the design of PDAs, tablets and supercomputers or the use of computers to control an industrial plant.[44] Computer engineers may also work on a system's software. However, the design of complex software systems is often the domain of software engineering, which is usually considered a separate discipline.[45] Desktop computers represent a tiny fraction of the devices a computer engineer might work on, as computer-like architectures are now found in a range of devices including video game consoles and DVD players.

Computers

Often instrumentation is not used by itself, but instead as the sensors of larger electrical systems. For example, a thermocouple might be used to help ensure a furnace's temperature remains constant.[43] For this reason, instrumentation engineering is often viewed as the counterpart of control engineering.

Instrumentation engineering deals with the design of devices to measure physical quantities such as pressure, flow and temperature.[41] The design of such instrumentation requires a good understanding of physics that often extends beyond electromagnetic theory. For example, flight instruments measure variables such as wind speed and altitude to enable pilots the control of aircraft analytically. Similarly, thermocouples use the Peltier-Seebeck effect to measure the temperature difference between two points.[42]

Flight instruments provide pilots with the tools to control aircraft analytically.

Instrumentation

Once the transmission characteristics of a system are determined, telecommunication engineers design the transmitters and receivers needed for such systems. These two are sometimes combined to form a two-way communication device known as a transceiver. A key consideration in the design of transmitters is their power consumption as this is closely related to their signal strength.[39][40] If the signal strength of a transmitter is insufficient the signal's information will be corrupted by noise.

Telecommunications engineering focuses on the transmission of information across a channel such as a coax cable, optical fiber or free space.[37] Transmissions across free space require information to be encoded in a carrier wave to shift the information to a carrier frequency suitable for transmission, this is known as modulation. Popular analog modulation techniques include amplitude modulation and frequency modulation.[38] The choice of modulation affects the cost and performance of a system and these two factors must be balanced carefully by the engineer.

Satellite dishes are a crucial component in the analysis of satellite information.

Telecommunications

DSP processor ICs are found in every type of modern electronic systems and products including, SDTV | HDTV sets,[35] radios and mobile communication devices, Hi-Fi audio equipment, Dolby noise reduction algorithms, GSM mobile phones, mp3 multimedia players, camcorders and digital cameras, automobile control systems, noise cancelling headphones, digital spectrum analyzers, intelligent missile guidance, radar, GPS based cruise control systems and all kinds of image processing, video processing, audio processing and speech processing systems.[36]

Signal Processing is a very mathematically oriented and intensive area forming the core of digital signal processing and it is rapidly expanding with new applications in every field of electrical engineering such as communications, control, radar, audio engineering, broadcast engineering, power electronics and bio-medical engineering as many already existing analog systems are replaced with their digital counterparts. Analog signal processing is still important in the design of many control systems.

Signal processing deals with the analysis and manipulation of signals.[33] Signals can be either analog, in which case the signal varies continuously according to the information, or digital, in which case the signal varies according to a series of discrete values representing the information. For analog signals, signal processing may involve the amplification and filtering of audio signals for audio equipment or the modulation and demodulation of signals for telecommunications. For digital signals, signal processing may involve the compression, error detection and error correction of digitally sampled signals.[34]

A Bayer filter on a CCD requires signal processing to get a red, green, and blue value at each pixel.

Signal processing

Microelectronic components are created by chemically fabricating wafers of semiconductors such as silicon (at higher frequencies, compound semiconductors like gallium arsenide and indium phosphide) to obtain the desired transport of electronic charge and control of current. The field of microelectronics involves a significant amount of chemistry and material science and requires the electronic engineer working in the field to have a very good working knowledge of the effects of quantum mechanics.[32]

Microelectronics engineering deals with the design and microfabrication of very small electronic circuit components for use in an integrated circuit or sometimes for use on their own as a general electronic component.[30] The most common microelectronic components are semiconductor transistors, although all main electronic components (resistors, capacitors etc.) can be created at a microscopic level. Nanoelectronics is the further scaling of devices down to nanometer levels. Modern devices are already in the nanometer regime, with below 100 nm processing having been standard since about 2002.[31]

Microelectronics

Before the invention of the integrated circuit in 1959,[28] electronic circuits were constructed from discrete components that could be manipulated by humans. These discrete circuits consumed much space and power and were limited in speed, although they are still common in some applications. By contrast, integrated circuits packed a large number—often millions—of tiny electrical components, mainly transistors,[29] into a small chip around the size of a coin. This allowed for the powerful computers and other electronic devices we see today.

Prior to the Second World War, the subject was commonly known as radio engineering and basically was restricted to aspects of communications and radar, commercial radio and early television.[24] Later, in post war years, as consumer devices began to be developed, the field grew to include modern television, audio systems, computers and microprocessors. In the mid-to-late 1950s, the term radio engineering gradually gave way to the name electronic engineering.

Electronic engineering involves the design and testing of electronic circuits that use the properties of components such as resistors, capacitors, inductors, diodes and transistors to achieve a particular functionality.[24] The tuned circuit, which allows the user of a radio to filter out all but a single station, is just one example of such a circuit. Another example (of a pneumatic signal conditioner) is shown in the adjacent photograph.

Electronics

Control engineers often utilize feedback when designing control systems. For example, in an automobile with cruise control the vehicle's speed is continuously monitored and fed back to the system which adjusts the motor's power output accordingly. Where there is regular feedback, control theory can be used to determine how the system responds to such feedback.[27]

Control engineering focuses on the modeling of a diverse range of dynamic systems and the design of controllers that will cause these systems to behave in the desired manner.[25] To implement such controllers electrical engineers may use electrical circuits, digital signal processors, microcontrollers and PLCs (Programmable Logic Controllers). Control engineering has a wide range of applications from the flight and propulsion systems of commercial airliners to the cruise control present in many modern automobiles.[26] It also plays an important role in industrial automation.

Control systems play a critical role in space flight.

Control

Power engineering deals with the generation, transmission and distribution of electricity as well as the design of a range of related devices.[23] These include transformers, electric generators, electric motors, high voltage engineering, and power electronics. In many regions of the world, governments maintain an electrical network called a power grid that connects a variety of generators together with users of their energy. Users purchase electrical energy from the grid, avoiding the costly exercise of having to generate their own. Power engineers may work on the design and maintenance of the power grid as well as the power systems that connect to it.[24] Such systems are called on-grid power systems and may supply the grid with additional power, draw power from the grid or do both. Power engineers may also work on systems that do not connect to the grid, called off-grid power systems, which in some cases are preferable to on-grid systems. The future includes Satellite controlled power systems, with feedback in real time to prevent power surges and prevent blackouts.

Power

Electrical engineering has many subdisciplines, the most common of which are listed below. Although there are electrical engineers who focus exclusively on one of these subdisciplines, many deal with a combination of them. Sometimes certain fields, such as electronic engineering and computer engineering, are considered separate disciplines in their own right.

Subdisciplines

The invention of the transistor in late 1947 by William B. Shockley, John Bardeen, and Walter Brattain of the Bell Telephone Laboratories opened the door for more compact devices and led to the development of the integrated circuit in 1958 by Jack Kilby and independently in 1959 by Robert Noyce.[21] Starting in 1968, Ted Hoff and a team at the Intel Corporation invented the first commercial microprocessor, which foreshadowed the personal computer. The Intel 4004 was a four-bit processor released in 1971, but in 1973 the Intel 8080, an eight-bit processor, made the first personal computer, the Altair 8800, possible.[22]

Solid-state transistors

In 1941 Konrad Zuse presented the Z3, the world's first fully functional and programmable computer using electromechanical parts. In 1943 Tommy Flowers designed and built the Colossus, the world's first fully functional, electronic, digital and programmable computer.[19] In 1946 the ENIAC (Electronic Numerical Integrator and Computer) of John Presper Eckert and John Mauchly followed, beginning the computing era. The arithmetic performance of these machines allowed engineers to develop completely new technologies and achieve new objectives, including the Apollo program which culminated in landing astronauts on the Moon.[20]

In 1920 Albert Hull developed the magnetron which would eventually lead to the development of the microwave oven in 1946 by Percy Spencer.[16][17] In 1934 the British military began to make strides toward radar (which also uses the magnetron) under the direction of Dr Wimperis, culminating in the operation of the first radar station at Bawdsey in August 1936.[18]

In 1897, Karl Ferdinand Braun introduced the cathode ray tube as part of an oscilloscope, a crucial enabling technology for electronic television.[14] John Fleming invented the first radio tube, the diode, in 1904. Two years later, Robert von Lieben and Lee De Forest independently developed the amplifier tube, called the triode.[15]

During the development of radio, many scientists and inventors contributed to radio technology and electronics. The mathematical work of James Clerk Maxwell during the 1850s had shown the relationship of different forms of electromagnetic radiation including possibility of invisible airborn waves (later called "radio waves"). In his classic physics experiments of 1888, Heinrich Hertz proved Maxwell's theory by transmitting radio waves with a spark-gap transmitter, and detected them by using simple electrical devices. Other physicists experimented with these new waves and in the process developed devices for transmitting and detecting them. In 1895 Guglielmo Marconi began work on a way to adapt the known methods of transmitting and detecting these "Hertzian waves" into a purpose built commercial wireless telegraphic system. Early on, he sent wireless signals over a distance of one and a half miles. In December 1901, he sent wireless waves that were not affected by the curvature of the Earth. Marconi later transmitted the wireless signals across the Atlantic between Poldhu, Cornwall, and St. John's, Newfoundland, a distance of 2,100 miles (3,400 km).[13]

Guglielmo Marconi known for his pioneering work on long distance radio transmission

More modern developments

[12]

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