Concetti, esperimenti e pregiudizi: la lunga via verso la legge di Ohm. (Traduzione da Naturwissenschaften im Unterricht PHYSIK/CHEMIE n. 50, dicembre 1989, a cura di A.M. Fichera)

From 1775 to 1826 Ohm’s Law was gradually approached through the investigations of many researchers, stating with Cavendish. This article discusses the main experiments and the evolution of the underlying ideas, among which the concept of internal resistance of electrical generators eventually proved itself essential to Ohm’s discovery.