Ampere (source code)
= Ampere
{title2=$\mathrm A=\mathrm{C/s}$}
{wiki}
The <ampere> is the <SI> unit of <electric current>. Since 20 May 2019 its definition fixes the <elementary charge> exactly at $e=1.602176634\times10^{-19}\,\mathrm C$, with $\mathrm C=\mathrm{A\,s}$. This gives electrical measurements a reference based on a fixed <elementary charge>. https://www.nist.gov/si-redefinition/ampere-introduction[NIST, Ampere: introduction to the 2019 definition]{ref}; https://physics.nist.gov/cuu/Constants/Value/e.html[NIST, CODATA value of the elementary charge]{ref}.
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