Nature of Electricity
Drift Velocity & Electron Mobility
Heating Effect of Electric Current
Magnetic field of current carrying conductor
Magnetic Flux Density
Resistance Variation with Temperature
Temperature Coefficient of Resistance
Theory of Electrical Potential
Capacitor and Capacitance
What is Capacitor?
Single Phase Power
Single Phase Power Equations
Three Phase Power
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Electrical power system includes power generation, electrical power transmission & distribution, control & protection, electrical switchgear, power transformers, control & relays, transmission & distribution substations, and all switch yard equipments. All the very basic electrical engineering theories related to this field of technology are also included in this study site.This site is continually improving and in near future we will add many other functionality in this website to make it a complete solution for electrical technology. Please give your suggestion to make the site better. This is a complete reference of electrical engineering and technology.
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The most familiar form of energy in our daily life is electrical energy. The branch of engineering which deals with producing, managing and utilizing of this energy, is referred as electrical engineering. This field of engineering was introduced in organized manner in the mid of 19th century. Electrical technology is not as older as civil and mechanical technologies. The interest in this field of study was grown up after invention of electricity and then it commenced its journey. It was June 1752, Benjamin Franklin first tried to catch electricity from clouds during a heavy stormy weather with the help of flying kite. This was the beginning and till date we are trying to manage this energy. Managing electrical energy (producing, transmitting, distributing, utilizing) is nothing but referred as electrical engineering. Commercially this became an occupation only after 1950.
Electrical engineering is core engineering like civil and mechanical but it has wide range of subfields. After modernization, many fields of engineering took birth from electrical such as electronics, computer, telecommunication engineering and many more. All the fields of study directly or indirectly deal with electricity come under electrical engineering.
In power generation plant where electrical energy is produced, the application of this engineering is huge. All the mechanical and as well as electrical equipments involved in producing electrical energy, such as alternators, boilers, turbines etc. are controlled and protected by electrical signals. All the relays and switches involved in operation of these equipments are either electromechanical or static electronics devices. In modern age, these devices are digitally controlled by computer software. So in addition to core electrical engineering, other subfields of this engineering like electronic, computer, software engineering and IT are also involved in power generation.
During stepping up voltage level of generated power, electrical transformers are required. For proper control and protection of these transformers sophisticated switchgear system is required. Electrical switchgear includes all circuit breakers, electrical isolators, current transformers, potential transformers, control and relay system and many more. Modern electrical engineering deals with production, planning, operation, maintenance of these systems.
After stepping up the electrical power is transmitted to load center. Huge electrical technology is involved in electrical power transmission systems and networks including large national grids. The problems associated with these systems are solved by electrical engineering including its all subfield engineering’s.
History of Electrical Engineering
Benjamin Franklin in 1752, first man tried to utilize electricity from cloud by flying a kite during stormy night. In 1780, Luigi Galvani was surprised when he saw that dead frog’s leg twisted when it was touched by a silver and copper stick. He misunderstood the actual reason, thought that the electricity came from the leg itself and referred it as animal electricity. After development of voltaic cell as a simple method of producing electricity from chemical reaction, in 1800 by Alessandro Volta actual revolution occurred in this field and the history of electrical engineering was totally changed from this time.It is needless to say that most of the theories, based on which this field of engineering is build, are related to electromagnetism. The law of electromagnetism was invented by Michel Faraday in the year of 1831. This law is popularly known as Faraday’s law of electromagnetic induction.The relation between current and voltage in a conductor was already stated by Georg Ohm, in 1827. This is Ohm's law. Based on these two theories development electrical technology began. During his experiment of electromagnetic induction, Michel Faraday designed the most basic model of electrical rotating machine. In 1873, James Clerk Maxwell, published his famous article on magnetism and electricity.
Werner von Siemens the founder of German multinational engineering and electronic company Siemens, had a great contribution to the early days in history of electrical engineering. He was a great inventor and developer. Another great contributor to the electrical engineering was Sir Thomas Edison. We all know him as inventor of electric lighting bulb in the year 1879. This invention was a revolution. He was also the builder of first electrical supply network in the world.
Although there were so many developments and research works going on but before 1882, study of electricity was not recognized as a separate field of engineering. In that year electrical engineering was introduced as a separate branch of engineering by TU Darmstadt University Germany. This was the beginning of study for electrical engineering with professional degree. In that very year Edison started world’s first electric supply business at DC 110V. Initially total 59 houses of Manhattan were connected to his network.
Although, alternating current had already been developed in Europe in the year 1850 by Guillaume Duchenne. But still it was not commercially distributed. Then George Westinghouse, American entrepreneur and engineer, came forward and financially supported the development of AC power network. By the end of nineteenth century AC power transmission and distribution became most popular and stared dominating DC distribution system.
After development of distribution network, electricity was reached at consumer ends. After electricity comes to their end this is utilized for operating different equipments run by electricity. Electrical engineering also involves in developing such industrial and domestic equipments at consumer ends.
Many scientists and engineers involved themselves in inventing and developing such equipments. A new window had been opened in history of electrical engineering.
In 1895, Nikola Tesla transmitted radio frequency signal from eighty kilometer away and developed radio transmitters.
In 1897, cathode ray tube was invented by Karl Ferdinand Braun and development television technology began.
In 1902, Willis Carrier developed air conditioning machines.
In 1941, Konrad Zuse introduced first form of programmable electromechanical computer.
In 1943, Tommy Flowers produced first prototype of programmable digital computer.
In 1946 Percy Spencer discovered micro oven.
Every day there are new inventions and developments in electrical engineering and technology. The discussion will not come to the end. We just tried to give an overview only.