He is the inventor of Solenoid.
The S.I. unit of electric current is Ampere (A) is named after him.
Reference Source:
[1] Wikipedia Contributors. “André-Marie Ampère.” Wikipedia, Wikimedia Foundation, 29 Sept. 2021, en.wikipedia.org/wiki/Andr%C3%A9-Marie_Amp%C3%A8re. Accessed 31 Oct. 2021.