Intro To The Electricity

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Intro To The Electricity

  1. 1. Intro to the electricity Made by Megarhynchos
  2. 2.  Sometimes hard work of men, was replaced today with technical tools, devices and computers who need energy to work. Not one form of energy is not so used in today’s work as much as electric energy. For that reason the basic knowledge about electricity do not only become a part of general culture, but necessity . Made by Megarhynchos
  3. 3.  If you touch over the metal latch of the door with the woolen carpet, you feel a slight strike of tingle. Also if it is a dry weather and you dress a synthetic shirt over the nylon shirt, you feel a slight strike, and you can also hear crackling. If you do that thing in the dark, you can notice arcing. Made by Megarhynchos
  4. 4.  Most of that effects are not new. First knowledge about electricity originate from antic times. Greek philosopher Tales from Miletus while doing an experiment with yellow amber, first saw the effect that if amber is rubbed with wool or fur, it takes feature to attract tiny pieces of paper, straw, dry leaves, hair and pieces of linen fabric. Made by Megarhynchos
  5. 5.  Word “electric, electrical engineering, and electronic” were made from Greek word “ἤλεκτρον“ which means “electron“, that’s how they called amber. Almost two centuries after Tales, this name is imported in contemporary science by English naturalist William Gilbert. Gilbert saw that glass stick had properties similar to amber when it was rubbed with silk fabric, it attracted easy objects like hair or tiny pieces of paper. Made by Megarhynchos
  6. 6.  Gilbert’s experiments gave another knowledge: two glass sticks rubbed with silk, and two ambers rubbed with fur, had property to reject itself after they were in close distance. The effect of attracting easy objects made of amber or glass sticks, rubbed with silk or fur, and mutually rejecting of two rubbed sticks or ambers is attributed to electricity. Made by Megarhynchos
  7. 7.  C. F. Cisternay du Fay tried to explain this effect by introducing two types of electricity which he called “vitreous” and “resinous”. With discovery of Leyden bottle, there came the thought about saving electricity which granted opportunities to experiment with electricity. For Leyden bottle we can say that is was the first form of contemporary capacitators. Made by Megarhynchos
  8. 8.  American philosopher and publicist Benjamin Franklin in 1752 was doing experiments with “flying dragon” in the time of thunder. He discovered electrical nature of lightning which until than was a mystery. He set hypothesis: There is only one type of electricity. The object is charged only if there is excess or shortage of charge than a neutral, balanced stance. Made by Megarhynchos
  9. 9.  Based on today’s knowledge, there are two types of electricity, called positive and negative which are marked with algebraic sign. This deal actually fits to Franklins marking, positive charge is the one which appears on glass when it rubs with silk fabric, and negative charge appears on ebony stick when rubbed with fur. Made by Megarhynchos
  10. 10.  French Charles de Coulomb in 1785. is performing experiment with two charged balls and sets law about force which works between two charges. The basic law of electrostatic is just named after him – Coulomb law. Made by Megarhynchos
  11. 11.  Term of static charge begins to be popular in the beginning of the 19th century, when Galvan and Volta set foundations of charges in motion. Luigi Galvani noticed that electricity appears when metal comes in contact with frog leg, so called “ Animal electricity “ which impressed his coworker physicist Aleksandar Volta. Volta made an experiment with two metal plates made from different metals, which he soaked in conducting fluid and got and chemical source of electric energy. In honor to Galvani, that current was named after him, galvanic current, and first source was named voltaic pile. This was the first permanent source of current. Made by Megarhynchos
  12. 12.  With the invention of chemical source of current, electric engineering practice is rapidly progressing and in very short period there was a lot of significant findings. Not long from Volta’s discovery, H. C. Oersted noticed that magnetic needle twists in close distance with the conductor trough which current flows. Made by Megarhynchos
  13. 13.  That invention inspired A. Amper so he not long from that time, 1820. discovered how conductors through which current flows, are working one to another with force, rejecting or attracting. Not long from that, M. Faraday 1831. reached the most significant success in history of electric engineering, by producing electricity from magnet, respectively, discovering principle of electromagnetic induction and dynamo, From foundations of Faraday’s research results, the new age in a field of scientific research and practice usage begins. Made by Megarhynchos
  14. 14.  In that time electric and magnetic appearances are watched as independent and only connection between them was the fact that the electric currents were the ones who created electric and magnetic field. Basic laws weren’t mutually connected with anything. Made by Megarhynchos
  15. 15.  J. C. Maxwell introduced set of equations which involved electromagnetic appearances and are presenting scientific basic of today’s electric engineering. H. R. Hertz 1888. confirmed existence of electromagnetic waves with a simple experiment. Made by Megarhynchos
  16. 16.  In the time when this discoveries and theories were found, the many other fields of usage were using that discoveries. The high success had electric industry, power sector and telecommunications. All this fields of practice contributed with their massive usage to the sudden success of the electric engineering. Made by Megarhynchos
  17. 17.  Thanks to Nikola Tesla, and his multiphase electric currents and rotating magnetic field, the process of building power plants, and economic transmission of alternating electric current on great distances is accelerated. Made by Megarhynchos

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