L30_Elec2

L30_Elec2 - Interlude: A bit of history Luigi Galvani...

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Interlude: A bit of history Luigi Galvani (1737-1798): Italian physician, studied “animal electricity”
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From Galvani's own description of the experiments: " Therefore having noticed that frog preparations which hung by copper hooks from the iron railings surrounding a balcony of our house contracted not only during thunder storms but also in fine weather, I decided to determine whether or not these contractions were due to the action of atmospheric electricity. ...Finally. ...I began to scrape and press the hook fastened to the back bone against the iron railing to see whether by such a procedure contractions might be excited, and whether instead of an alteration in the condition of the atmospheric electricity some other changes might be effective. I then noticed frequent contractions, none of which depended on the variations of the weather ." 1870: constructed first electric cell with 2 different metals and natural fluids from dissected frog
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Alessandro Volta (1745-1827): professor at the University of Pisa (Italy) 1780: improved electrical cell (2 metals Ag and Zn, leather, salt water) Volta demonstrated the actions of piles such as the one shown to Napoleon who was reportedly quite impressed. A year after Volta was created count by Napoleon.
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Sir Michael Faraday
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1813: Sir Humphrey Davy (England) constructed a giant battery (2,000 plates, 889 sq. ft. in the basement of Britain Royal Society). He studied chemical transformations induced by electrical current, e.g., he produced elemental Na and K from their hydroxides. 1860:
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L30_Elec2 - Interlude: A bit of history Luigi Galvani...

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