Astronomy View all facts Glossary Help |
abstraction > mathematical concept > unit > electromagnetic unit > current unit |
current unit comparison table |
Subject | has historical origin | is an instance of | is an acronym for | represent | is a unit of | has consequence | has symbol | has definition |
---|---|---|---|---|---|---|---|---|
ampere | base SI unit | Syteme Internationale | current | fixes the magnetic constant (permeability of vacuum) at exactly 4 × 10-7 H · m-1 | A | constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 × 10-7 newton per meter of length |
Next electromagnetic unit: electric potential unit Up: electromagnetic unit Previous electromagnetic unit: conductance unit