## Wikipedia - Corrente elettrica ampere, $$\text{A}$$

https://doi.org/10.1351/goldbook.A00300
The ampere, symbol $$\text{A}$$, is the SI unit of electric current. It is defined by taking the fixed numerical value of the @E02032@ $$e$$ to be $$1.602\ 176\ 634\times10^{-19}$$ when expressed in the unit $$\text{C}$$, which is equal to $$\text{A s}$$, where the second is defined in terms of @S05854@.
Source:
BIPM, The International System of Units, SI Brochure, 9th ed. (2019) [Terms] [Book]