History of Ampere and Kelvin
In the third installment of Metric Matters, Dr.
On Oct. 10, 1933, the eighth meeting of the General Conference on Weights and Measures, also known as CGPM, considered the necessity of substituting “international electric units” with “absolute electric units.”
On Oct. 21, 1948, the ninth CGPM meeting abolished absolute electric units and adopted the ampere as the unit of electric current.
The CGPM’s definition was, “The ampere is that constant current, which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2×10ˉ7 newton per meter of length.”
The unit of electric current is named after André-Marie Ampère (1775-1836), a French mathematician, physicist, chemist and philosopher. He is best known for work in electromagnetism.
Review the print ads from this magazine to continue
This quick advertiser review unlocks the rest of the article and keeps the full-screen reader focused on the ads instead of the page chrome.
Continue reading
May 2020
Related
MFGAxis Discussion
Be part of the shop-floor conversation
Like, save, or comment on this CTE story.
MFGAxis Discussion