Gosh. I remember the ampere as the current that would deposit a given weight of silver in a fixed time...
Also saw a note about one part in e-20. As the universe is apparently about 5e17 sec old, can we make a standard that is good to 1 sec in 1e20 sec??? Don Dr. David Kirkby > David C. Partridge wrote: > >> No they cannot be - yet. At the point where (e.g.) the second is >> re-defined >> in terms of the aluminium quantum clock, then the aluminium quantum >> clocks >> are then by definition the primary standards of time, and all the Cs >> clocks >> are now secondary standards as the second is no longer defined in terms >> of >> the Cs beam clock. >> >> Dave > > Does that mean that there is no primary standard for the Ampere? > > An Ampere is defined as the current which will produce an attractive force > of 2 > Ã 10â7 newtons per metre of length between two straight, parallel > conductors of > infinite length and negligible circular cross section placed one metre > apart in > a vacuum. > > Since its impossible to build such a system, does that mean there is no > primary > standard for an amp? > > > > Dave > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Dr. Don Latham AJ7LL Six Mile Systems LLP 17850 Six Mile Road POB 134 Huson, MT, 59846 VOX 406-626-4304 www.lightningforensics.com www.sixmilesystems.com _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
