Guglielmo Marconi (b. Bologna, Italy, 25th April 1874, d. Rome, Italy, 20th July, 1937) was the second son of Giuseppe Marconi, a wealthy landowner, and his second wife, Annie Jameson, the daughter of an Irish Whiskey distiller. Giuseppe Marconi ruled his household in the style of a martinet. Guglielmo spent most of childhood away from home. Consequently, his education was neglected.
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Charles-Augustin Coulomb (b. Angouleme, France, 14th June 1736, d. Paris, France, 23rd August, 1806) was a pioneer in the field of electricity, magnetism and applied mechanics. The SI unit of quantity of electric charge was named after him as the Coulomb. In his electrical studies Coulomb determined the quantitative force law, gave the notion of electric mass, and studied charge leakage and the surface distribution of charge on conducting bodies. In magnetism he determined the quantitative force law, created a theory of magnetism based on molecular polarisation, and introduced the idea of demagnetisation.
Léon-Charles Thévenin (b.Meaux, France, 30th March 1857, d. Paris, 1926) was a French telegraph engineer and educator. He was the one to propose the equivalent generator theorem in 1883, 43 years before Norton's complementary theorem. The theorem is commonly called Thévenin's Theorem in his honour, but, in fact Hermann Von Helmholtz proposed it first in an 1853 paper.
James Prescott Joule (b. Salford, England, 24th Dec. 1818, d. Salford, England, 11th October 1889) was the second son of a prosperous brewer. The SI Unit of energy or work was named after him as the Joule.
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