International Electricity Congress

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The International Electricity Congress , also known as the Electrotechnical Congress , was first held in Paris in August 1881 . At the same time the First International Electricity Exhibition took place, at which, among other things, the light bulb developed by Thomas Alva Edison was shown.

history

250 delegates were sent from 22 states to Congress in 1881, including scholars, industrialists and high officials. An important task was the definition of electrical (otechnical) units , u. a. The decision between the English or German system, but initially only agreed for a CGS system . On September 21, 1881, the First International Electricity Congress established the ohm as the unit of measurement for electrical resistance , thereby also honoring the work of the German physicist Georg Simon Ohm . The units for electrical voltage and current, volts and amperes , which had already been used in some cases before , were also discussed at the same congress, but only adopted in Chicago in 1893 .

Further congresses followed at intervals of a few years, in between international expert commissions were set up for further elaboration.

At the 5th International Electricity Congress in 1900 - also in Paris - the electromagnetic cgs unit " Gauss " was defined. Instead of the electromagnetic unit Gauss, the SI unit Tesla has been in effect since 1970 (1 Gs = 10 −4  T).

In 1933 the International Electrotechnical Commission (IEC) determined at a meeting in Paris that 1 cm −½ g ½ s −1 as an electromagnetic CGS unit of magnetic field strength should be called " Oersted ". In 1935, at a conference in Scheveningen, the symbol "Gs" was defined for the Gauss.

In 1954 the base units candela and kelvin were defined, in 1971 the mole .

Web links

References and comments

  1. ↑ The unit of measurement for light intensity was previously the Violle unit from 1881, see Jules Violle (1841–1923)