http://en.wikipedia.org/wiki/Andr%C3%A9-Marie_Amp%C3%A8re
It is upper case A because it stands for M. Ampere, just as W stands for Mr.
Watt.
This SI unit is named after James Watt. As with every SI unit whose name is
derived from the proper name of a person, the first letter of its symbol is
uppercase (W). When an SI unit is spelled out in English, it should always
begin with a lowercase letter (watt), except where any word would be
capitalized, such as at the beginning of a sentence or in capitalized material
such as a title. Note that "degree Celsius" conforms to this rule because the
"d" is lowercase.
Based on The International System of Units, section 5.2.
Perhaps you were thinking as in "aH, my amphours are horribly low!"
I do not see in my little online investigation support for the idea of using
upper case abbreviations for quantities above one and lower case abbreviations
for quantities less than one. However, I was taught that way and I think it
*should* be the rule as it shows clearly the difference between mega and milli.
Norm
S/V Bandersnatch
Lying Julington Creek
30 07.695N 081 38.484W
Actually, Norm, I believe the correct abbreviation is "aH" - I think <g>....
I think the reasoning is the same as why kilowatt hours and kilowatts are
shortened to "kWh" and kWh"....
But I think all are acceptable....
And my spellchecker just confirmed that, for whatever that's worth.
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