Carlsen wrote:
> Nu er vi nogle stykker som har prøvet at finde årsagen til at strømstyrke
> betegnes I og spændingsforskel U. R kommer som bekendt fra det engelske ord
> Resistance...men hvad med I og U???
>
>
Et bud for I står her:
OHM's LAW:
http://www.ibiblio.org/obp/electricCircuits/DC/DC_2.html
Citat: "...The mathematical symbol for each quantity is meaningful as
well. The "R" for resistance and the "V" for voltage are both
self-explanatory, whereas "I" for current seems a bit weird. The "I" is
thought to have been meant to represent "Intensity" (of electron flow),
and the other symbol for voltage, "E," stands for "Electromotive force."
From what research I've been able to do, there seems to be some dispute
over the meaning of "I." The symbols "E" and "V" are interchangeable for
the most part, although some texts reserve "E" to represent voltage
across a source (such as a battery or generator) and "V" to represent
voltage across anything else. ..."
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Her er en forklaring på at U anvendes sammen med/istedet for V:
Webster's Revised Unabridged Dictionary (1913):
http://machaut.uchicago.edu/cgi-bin/WEBSTER.sh?WORD=U
Citat: "...
U the twenty-first letter of the English alphabet, is a cursive form of
the letter V, with which it was formerly used interchangeably, both
letters being then used both as vowels and consonants.
..."
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Per definition står U for en elektrisk potential forskel:
1.3.3 Electricity and magnetism Name Symbol Definition SI unit ... :
http://www.iupac.org/publications/analytical_compendium/Cha01sec33.pdf
ARTFL Project: 1913 Webster's Revised Unabridged Dictionary:
http://humanities.uchicago.edu/forms_unrest/webster.form.html
http://www.dict.org/bin/Dict
mvh/Glenn