André-Marie Ampère

André-Marie Ampère was a French physicist and mathematician whose experiments and mathematical work on electric currents and magnetism helped establish electrodynamics.

Hans Christian Ørsted: A Danish physicist whose 1820 experiment showed that an electric current deflects a magnetic compass needle. Ørsted’s discovery prompted Ampère’s experiments and theoretical account of interactions between currents.
Ampère's circuital law: A law relating the circulation of a magnetic field around a closed path to the electric current passing through it. It formalizes Ampère’s central link between electric current and magnetic field.
Oersted's experiment: Hans Christian Ørsted’s 1820 demonstration that a wire carrying electric current deflects a nearby compass needle. This observation supplied the starting evidence for Ampère’s research program.
Ampere: The SI base unit of electric current, defined by fixing the numerical value of the elementary charge. The unit honors Ampère’s foundational contributions to the study of electric currents.
Lyon: A city in southeastern France and the birthplace of André-Marie Ampère. Ampère was born and spent his early years in Lyon.
François Arago: A French physicist and politician who studied magnetism, optics, and the interaction of electric currents with iron. Arago demonstrated that a current could magnetize iron, a result Ampère incorporated into electrodynamics.
Ampère's force law: A mathematical expression for the force between two current-carrying elements. Ampère used force measurements between conductors to build a quantitative theory of electrodynamics.
Coulomb's law: A law describing the electrostatic force between two point charges. Ampère extended mathematical reasoning about forces to interactions between current-carrying conductors.
International System of Units: The internationally standardized system of measurement units used in science, technology, and commerce. The SI includes the ampere as its base unit for electric current.
Académie des sciences: France’s learned society for scientific research, founded in 1666. Ampère presented and developed his electrodynamic research within this scientific institution.

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