{"pid":"https://si-digital-framework.org/SI/units/ampere","unitId":"ampere","label":"ampere","symbol":"A","startValidity":"1948-01-01","endValidity":"2019-05-19","unitType":"SI base unit","unitTypeId":"https://si-digital-framework.org/SI#SIBaseUnit","unitDefinitionLabel":"ampere1948","unitDefinitionId":"https://si-digital-framework.org/SI#ampere1948","definition":"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 metre apart in vacuum, would produce between these conductors a force equal to ${2 \\times 10^{-7}}$ newton per metre of length.","definingResolution":"CGPM9-Res2","eventName":"9th meeting of the CGPM","eventDate":"1948-10-21","resolutionLink":"https://doi.org/10.59161/cgpm1948res2e","unitDefinitionStatus":"superseded","previousVersionDate":"1947-12-31","hasPreviousDefinition":false,"nextDefinition":"https://si-digital-framework.org/SI#ampere2018","resNbr":"2","resolutionBody":"CGPM","resolutionType":"Resolution","prefixRestriction":false,"unitQuantities":[{"code":"ELCU","label":"electric current"}],"notes":["The expression « MKS unit of force » which occurs in the original text has been replaced here by «newton», a name adopted for this unit by the 9th CGPM (1948, Resolution 7)."],"notesIds":["https://si-digital-framework.org/SI#ampere1948note1"],"nextVersionDate":"2019-05-20"}