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by: Dandre Olson


Dandre Olson
Eastern Washington University
GPA 3.73


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Class Notes
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This 1 page Class Notes was uploaded by Dandre Olson on Sunday October 11, 2015. The Class Notes belongs to TECH 208 at Eastern Washington University taught by Staff in Fall. Since its upload, it has received 20 views. For similar materials see /class/221487/tech-208-eastern-washington-university in OTHER at Eastern Washington University.

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Date Created: 10/11/15
History of Electricity DJ 0 D E People are curious We want to know what forces act behind natural phenomena 0 Lightning Hurricanes Rain etc From observing these people developed theory for magnetism electricity and electronics 0 Magnetism compass navigation world exploration 0 Electricity communications medicine electrical home devices etc heating cooling 0 Electronics Stereo computers etc Thales of Miletus 640 7 546 BC 0 Observed that rubbing amber yellowish translucent fossil attracts straw and dust 0 Greek amber elektron 0 Did NOT attract metal 0 However lodestone magnetite attracted little pieces of iron without rubbing William Gilbert 1540 7 1603 a Kept studying magnetism after people were already using the compass for navigation Chinese 1300 b Decided that it was NOT the heat given off by rubbing that made amber attract objects but the friction itself Benjamin Franklin mid 1700s a Concluded that electricity was NOT created but transferred There were two kinds of electricity positive and negative There was an electrical uid Fluid went from one body to another 1752 Famous kite experiment Tied a stiff wire to the tip of the kite when storm was about to break At the other end of the string he tied a metallic key Moistened string conducted electricity Alessandro Volta 1745 1827 a Voltaic pile b Stack of zinc and copper disks c Leather disks soaked in salt solution of mild acid vinegar or lemon juice d Created voltage Oersted 1820 a Demonstrated the relationship between magnetism and electricity b Brought a compass near a currentconducing wire c The compass needle was de ected qurhrDPOP


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