CHAPTER - 12 ELECTRICITY HOTS Questions for Practice 1. Name a substance whose resistance almost remains unchanged by increase of temperature. 2. Name two special characteristics of heater coil. 3. A wire of resistance 4 ohms is bent to form a circle. What is the resistance between two diametrically opposite ends? 4. How does the resistance of a conductor change if its temperature is increased? 5. A current of 4A flows in a wire of resistance 60 ohms. Calculate electrical energy consumed in 2 minutes
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Windmill Electricity | | Mankind been harnessing the wind’s energy for many years. From Holland to traditional farms around the world‚ windmills were used in the past for pumping water through primative irrigation systems or used to grind grain. Then‚ the wind turned large "sails" which were connected by a long vertical shaft that was attached to a grindnig machine or to a wheel that turned and drew water from a well. Today’s turbines - can utilize the energy of the wind to turn large metal
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conductor of electricity. If the electrons in an atom can’t be moved from their orbits at all‚ the material is an insulator. If at least some of the electrons can be moved‚ the material is a resistor. Two of the best-known conductors of electricity are silver and copper. The atomic structures of the silver and copper atom are compared in Figure 6. Note that both atoms have only one electron in the outermost orbit. This makes silver and copper excellent conductors of electricity. Silver is
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Electricity generation is the process of creating electricity from other forms of energy. The fundamental principles of electricity generation were discovered during the 1820s and early 1830s by the British scientist Michael Faraday. His basic method is still used today: electricity is generated by the movement of a loop of wire‚ or disc of copper between the poles of a magnet.[1] For electric utilities‚ it is the first process in the delivery of electricity to consumers. The other processes
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By Darren Francis 10/22/2010 Cocoa Production in West Africa This map shows the main cocoa production areas in West Africa. The patterns shows on this map indicate that the Southern coastline of West Africa is a major cocoa bean producing area. The pattern starts at Sierra Leone and follows the coastline down to Cameroon. Some exception to this pattern is in Nigeria‚ in the area of Port Harcourt there is no production and in Benin there is also no production. The brighter orange as indicated
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Electricity is important to life. A vast number of machines which are invented nowadays cannot be operated without it. As a matter of fact‚ electricity is used mostly in four main areas: industry‚ public health‚ media and transportation. First of all‚ electricity plays an integral part in industry. Thanks to the invention of electricity‚ a lot of equipment has been invented including computers‚ subways‚ bulbs‚etc .... .Electricity is the crucial factor in operating most devices. As a matter of
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Wonders of Electricity Electricity is the greatest gift of science to mankind. We have reached a point of our civilization when electricity is used for all purposes. Without it‚ our existence will be impossible. Electricity is a source of energy. It is produced by a battery or a coil of wires or by dynamo machine. It is produced in thermal station and also in hydro-project. There are various wonders of electricity. The most important of all is electric fan and electric light. These two things
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Electricity Project Electricity is a form of energy involving the flow of electrons. Now-a-days electricity has become quite-common in the world. Everybody sees the wonderful work of electricity. The lights on the streets are lit by the electric current. Electric fans work in the court‚ high court and office-rooms. Trains and trams are run by the electric power. They even made cars that run off electricity. So‚ electricity is no longer a strange thing. Electricity is a basic
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How does the author show sympathy for Curley’s wife? On the ranch there is a well known woman merely referred to as ‘Curley’s Wife’. As the characters develop we find that she is not in fact the unimportant‚ nameless character we first perceive her as‚ but rather she is a relatively complex one‚ with much more to her than we first gather‚ causing us to feel sympathy for her later in the novel. In this essay I will state how John Steinbeck influenced the reader to feel sympathy for Curley’s wife
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Home Search Collections Journals About Contact us My IOPscience Wireless electricity (Power) transmission using solar based power satellite technology This content has been downloaded from IOPscience. Please scroll down to see the full text. 2013 J. Phys.: Conf. Ser. 439 012046 (http://iopscience.iop.org/1742-6596/439/1/012046) View the table of contents for this issue‚ or go to the journal homepage for more Download details: IP Address: 49.145.98.152 This content was downloaded on 12/01/2015
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