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
× 10–7 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
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