Geodesic
To the determination of the unit of electric current in SI system
Problemy fiziki, matematiki i tehniki, no. 2 (2023), pp. 11-14

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In the international system of units “SI”, one of the main ones is the ampere. During its existence, the unit of electric current strength, the ampere, was redefined several times. According to the definition of 1948, the ampere was determined through the interaction force of two parallel straight conductors of infinite length and a negligibly small circular cross-sectional area. Since 2019, changes in the SI have come into force, which redefined the ampere based on fixing the numerical value of the elementary electric charge, adopted in Resolution 26 of the CGPM in 2018. The consequence of this was, in particular, that the coefficients for converting between SI units and units of the CGS system were no longer accurate. In this paper, we consider the possibility of modifying the 1948 definition by changing the configuration of interacting currents. In this case, infinite conductors are replaced by circular currents of finite length.
Keywords: system of units “SI”, ampere, electric current, interaction of currents. 
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N. A. Akhramenko. To the determination of the unit of electric current in SI system. Problemy fiziki, matematiki i tehniki, no. 2 (2023), pp. 11-14. http://geodesic.mathdoc.fr/item/PFMT_2023_2_a1/