Brian Reay wrote:

gareth wrote:
"Spike" wrote in message
...
On 20/01/2016 10:43, Brian Reay wrote:
gareth wrote:
"Jim GM4DHJ ..." wrote
but hertz means NOTHING whereas c/s describes cycles per second ...much
better ...
Whereas Ampere means ions per second
Charge (Coulombs) per second.
One Amp is one Coulomb per second.
Since the Ampere and the second are fundamental units in the SI system,
and the Coulomb is a unit derived from them and therefore is not a
fundamental unit, then one should say that
1 Coulomb = 1 Ampere-second
Read up on 'SI fundamental units'.

(The SI is but one in a number of arbitrary systems of units)

ISTR that the SI system is based upon things that can actually be measured
experimentally and not upon some theoretical bases that cannot be measured.

But how does one fashion a pair of infinitely long parallel wires in order
to be able
to measure an ampere has yet to be revealed :-)



You seem to be confusing two methods. One based on charge per second
another based on force between conductors. That is the danger of trying to
impress by using Google.


On this occcasion you are mistaken. Currently the Ampere is defined in
terms of magnetic force between infinite parallel conductors, and units
of charge are defived from it. This of course has no effect on the
usefullness of given practical methods of measuring current.


--

Roger Hayter