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Symbolstandard unitelectric currentcoulombAndré-Marie Ampèreelectromagnetismparallelmetrevacuumnewtons












ampere




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Diagram of the definition of the ampere


The ampere or amp (Symbol: A) is the standard unit of electric current. An electric current of one amp is one coulomb per second. The amp is named after André-Marie Ampère who studied electromagnetism.


The amp is defined using two parallel wires placed one metre apart in a vacuum. The wires are very long and very thin. One amp is defined as the current producing an attractive force of 2×10–7newtons per metre of length between these wires.[1]



References |



  1. ↑ Paul M. S. Monk, Physical Chemistry: Understanding our Chemical World, John Wiley and Sons, 2004 online.


Other websites |


  • The NIST Reference on Constants, Units, and Uncertainty

  • A short history of the SI units in electricity










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