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abstraction > mathematical concept > unit > electromagnetic unit > current unit

current unit
subject			fact

current unit	is a unit of current
	is a kind of electromagnetic unit
unit	has historical origin
	represents

Kinds of current unit :

• ampere (6 facts) (A) - Unit of electric current. "The ampere is that 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" CIPM 1946, Resolution 2, approved by the 9th CGPM 1948). A current of 1 A is equivalent to the passage along the filament of a light bulb of about 6 × 10¹⁸ electronic charges per second., 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