I fully agree with Statter. The decision was made some time in the 20th Century that multipliers above one would be capitals and below one would be lower case, but they decided at the same time that kilo was too well established as a lower case 'k' for them to change it [Edit: particularly in km and kg], and as it didn't cause any confusion it would remain as lower case. The ones that would have caused confusion were Mega- (M) and milli- (m) or Deka- (D) and deci- (d) though it turns out that the latter are rarely used.
As for Inverter/Invertor, you can get the answer if you go to IEC, as both are used in different standards. I think the trend is for the newer standards to opt for Inverter to try to get some standardisation between standards, so to speak, but either is acceptable.
I fully agree with Statter. The decision was made some time in the 20th Century that multipliers above one would be capitals and below one would be lower case, but they decided at the same time that kilo was too well established as a lower case 'k' for them to change it [Edit: particularly in km and kg], and as it didn't cause any confusion it would remain as lower case. The ones that would have caused confusion were Mega- (M) and milli- (m) or Deka- (D) and deci- (d) though it turns out that the latter are rarely used.
As for Inverter/Invertor, you can get the answer if you go to IEC, as both are used in different standards. I think the trend is for the newer standards to opt for Inverter to try to get some standardisation between standards, so to speak, but either is acceptable.
