Ampere definition  | Moving charges and magnetism | Physics | Khan Academy
Channel: Khan Academy India - English
Date: 2021-03-26

Let's explore the definition of Ampere. Until quite recently, the Ampere was defined to be that current which when passed through two long straight wires kept 1 meter apart in a vacuum, attracted each other with a force per unit length of 2 X 10^-7 N/m. [The definition was revised in May 2019]
More information here
https://en.wikipedia.org/wiki/2019_redefinition_of_the_SI_base_units


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