EE111Lect3EEhistoryFall06

EE111Lect3EEhistoryFall06 - EE 111 A Brief History of EE...

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EE 111 A Brief History of EE Dean Arakaki Fall 2006
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Early History • 600 BC: The electrical properties of amber are observed by ancient Greeks – Thales of Miletus: Amber becomes charged by rubbing with a wool cloth • 100 BC: Chinese used lodestone in a compass • 1600 – 1700: – English scientist William Gilbert published his book: De Magnete • Magnetism: induced magnetism, magnetic fields unaffected by a flame, permanent magnets affected by heat – More experimental results: • Boyle: electric force transmission in vacuum • Guericke: an early electrical generator • The Leyden jar
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Guericke’s Experiment, 1663 Courtesy of Burndy Library Courtesy of Burndy Library
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The Leyden Jar, 1745
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Benjamin Franklin (1706-1790) The kite experiment, 1752
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Alessandro Volta (1745-1827) • Invention of the voltaic pile, the first battery 1800 Spark gap leads
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Michael Faraday (1791-1867) • Invented the first electric motor (1821) • Discovered electromagnetic induction (1831) http://www.scienceandsociety.co.uk/Pix/PER/26/10198926_T.JPG
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Additional History • 1825: Andre-Marie Ampere defined electrodynamics • 1827: Georg Ohm discovered Ohm’s law • 1836: Samuel Morse devised a simple relay – Refined from Joseph Henry for message transmission • 1836: Electric light (battery operated) • 1841: James Joule discovered current and energy are directly proportional – Interested in converting energy between electrical and mechanical forms for his family’s brewery plant • 1843: Morse transmitted telegraph signals • 1873: James Maxwell published his book “ A Treatise on Electricity and Magnetism
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EE111Lect3EEhistoryFall06 - EE 111 A Brief History of EE...

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