Basic Electronics Electronics

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Basic Electronics Electronics Today Advances in electronics have given us pocket calculators, digital watches, heart pacemakers, computers for industry, commerce and scientific reach, automatically controlled production processes, instant viewing on our television screens of events n the other side of the world and a host of other applications. These have become possible largely because we have learned how to build complete circuits, containing thousands of electronic parts, on a tiny wafer of silicon no more than 5mm square and 0.5 mm thick. Microelectronics is concerned with these ‘densely populated’, miniaturized integrated circuits (ICS), or ‘chips’ as they are called, which are changing the way we live and work and challenging us to see that the changes are for the better. Chips are also used to control robots in factories, electric cookers, washing machines and traffic lights; they are the brains behind TV games and microcomputers; they form the hearts of machines for teaching spelling and arithmetic and can even be used to mix cocktails and recognize signatures! Today, electronics is being used to an ever-increasing extent in communication, control and computer systems as well as in domestic products and for medical care. In the first Industrial revolution, machines replaced muscles. In the second, now upon us, and brought about by microelectronics, brainpower is being replaced. Few areas of human activity are likely to escape. Resistance ”Resistance is anything that causes an opposition to the flow of electricity in a circuit. It is used to control the amount of voltage and/or amperage in a circuit. Everything in the circuit causes a resistance (even wire). It is measured in OHMS”. (http://webhome.idirect.com/~jadams/ele...

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... changing magnetic field, which passes through the secondary, thereby inducing a changing (alternating) voltage in the secondary. It is important that as much as possible of the magnetic field produced by the primary passes through the secondary. You should also notice that the induced voltage in the secondary is always of opposite polarity to the primary voltage (Lenz’s law). Too large a current in the transformer causes magnetic saturation of the core i.e. the magnetization of the core is a maximum and it is no longer able to follow changes of magnetizing current. References Tom Duncan, Success in Electronics, John Murray (Publishers) Ltd. http://webhome.idirect.com/~jadams/electronics/v_c_r.htm http://www.ham-shack.com/electronics.html http://arts.ucsc.edu/ems/music/tech_background/TE-05/teces_05.html http://webhome.idirect.com/~jadams/electronics/circuit.htm

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