The World Book, Vol. 4 of 10 PDF ePub eBook

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The World Book, Vol. 4 of 10 free pdf Excerpt from The World Book, Vol. 4 of 10: Organized Knowledge in Story and Picture Electrolyte, e lek'tro lite, any chemical compound which can be decomposed by an electric current. The substance resulting from such decomposition is called an ion. Elec'tromag'net, a magnet produced by the magnetic action of an electric current. An electromagnet consists essentially of a coil of wire having an iron core, and it is usually of horseshoe form. The story of the development of the electromagnet is the story of our modern electrical industries, for the electromagnet is the foundation of nearly all the great electrical inventions. Without it there could be no telegraph, telephone, electric light or electric power. Strong electromagnets are used for lifting heavy weights of iron. The lifting magnet is lowered from the arm of a crane until it is in contact with the iron- the electric circuit is then closed and the magnet attracts the iron and holds it firmly. Magnet and iron are then lifted by the crane, swung to the place where it is desired to deposit the iron, when the current is cut off and the magnet releases its hold. In this way masses of iron weighing many thousands of pounds, as well as red-hot iron, can readily be moved. The strength of an electromagnet depends on the number of turns of wire, the strength of the current and the permeability of the iron core. By the permeability of the iron core is meant the magnetic strength produced in the iron by a certain magnetizing force- the greater the permeability the more strongly will a given current magnetize the iron. The invention of an insulating covering made it possible to wind many turns of wire on an iron core and produce a strong electromagnet (see Insulator) . This in turn made possible the telegraph relay, in which a very weak current produces sufficient magnetic force to move the armature. It also made possible the strong electromagnets used in modern dynamo-electric machinery.e.e.b. Elec' tromagnet' ic Theory Of Light. According to this theory light consists of very short electromagnetic waves, com-126monly called electric waves, which are transmitted through the ether (see Electricity). The wireless telegraph message is also transmitted by waves in the ether. The two kinds of waves are known to be alike in many respects- either may be reflected from a mirror surface of metal- electric waves are bent on entering certain substances as light is bent on entering water- certain substances are transparent to electric waves as glass is transparent to light. The fact that light waves and electric waves are alike in so many respects leads to the belief that they are of the same kind, the only difference being in the length of the waves. It was Maxwell's mathematical proof that electromagnetic energy is transmitted by waves of the same kind as light waves, which led to the discovery of the wireless telegraph. The waves used in wireless telegraphy are produced by a violent electrical discharge in the air. The discharge at the spark gap of a wireless telegraph sending instrument consists, according to the electron theory, of violent motion of electrons across the gap. Light is believed to be produced also by motion of the electrons. To produce light the electrons must vibrate in a very small space with very great speed. The space in which the electron vibrates is equal to that occupied by an atom. The speed is so great that the electron to produce light that is just visible (red light) must make about as many vibrations in a second as there are seconds in twelve million years. We know this because we know the number of light waves produced in one second and it requires one vibration for each wave. To produce white light the electron must vibrate much faster. Heating an object sets the electrons vibrating violently and thus causes them to send out very short electromagnetic, or light, waves. In this manner heat produces light.

About M V O'Shea

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Details Book

Author : M V O'Shea
Publisher : Forgotten Books
Data Published : 27 September 2015
ISBN : 1330395530
EAN : 9781330395530
Format Book : PDF, Epub, DOCx, TXT
Number of Pages : 684 pages
Age + : 15 years
Language : English
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  • The World Book, Vol. 4 of 10 free pdfThe World Book, Vol. 4 of 10

    . Excerpt from The World Book, Vol. 4 of 10: Organized Knowledge in Story and Picture Electrolyte, e lek'tro lite, any chemical compound which can be decomposed by an electric current. The substance r