Related Content

Related Overviews


More Like This

Show all results sharing these subjects:

  • Science and technology
  • Chemistry


Show Summary Details



Quick Reference

Symbol A. The SI unit of electric current. The constant current that, maintained in two straight parallel infinite conductors of negligible cross section placed one metre apart in a vacuum, would produce a force between the conductors of 2 × 10−7 N m−1. This definition replaced the earlier international ampere defined as the current required to deposit 0.001 118 00 gram of silver from a solution of silver nitrate in one second. The unit is named after the French physicist André Marie Ampère (1775–1836).

Reference entries

View all reference entries »