1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why eletric charge in Dimensional Analysis and not eletric current?

  1. Sep 14, 2011 #1
    2 questions,actually:

    1-Why in Dymensional Analysis is eletric charge a basic physical dimension instead of eletric current(as Ampere is a SI base unit and Coulomb isn't)?

    2-I've read CIPM(or International Committee for Weights and Measures in English) is proposing new definitions for some of the current 7 base units,in which the supporters want to set some of the current definitons based on fundamental constants such as Avogadro or Planck constants.For further information:


    What's your opinion?Do you consider that the current SI definitions need revisions?
    Last edited: Sep 14, 2011
  2. jcsd
  3. Sep 15, 2011 #2
    As you know, current is the rate of flow of charge and therefore the unit of charge is simpler than the unit of current. Relativity has a lot to do with charge being a more convenient unit than current as charge is not affected by time dilation so the Coulomb remains the Coulomb whereas the Ampere depends on your frame of reference.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook