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B Why is the Ampere a base unit?

  1. May 11, 2016 #1
    Just out of curiosity, why is the Ampere a base unit and not the Columb? It seems to me that charge is more fundamental than current. Thanks!
  2. jcsd
  3. May 11, 2016 #2
    It's easier to measure a current than a charge.
  4. May 11, 2016 #3


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  5. May 12, 2016 #4


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    And there are also a number of other reason. One very important property of the base units is that they are technologically/commercially important.. People forget that the SI is mainly a practical system for use in our everyday lives (which is why the Candela is a base unit) ; meaning practical considerations are more important that what is most satisfying from a philosophical point of view.

    The re-definition of the SI will see the Ampere (as well as a few other units) be re-defined, but it will still be the base unit for the electrical units,
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