Various scientists proposed that electricity and magnetism, both capable of causing attraction and repulsion of objects, were linked. Berbagai ilmuwan mengusulkan bahwa listrik dan magnet, keduanya mampu menyebabkan tarikan dan tolakan objek, itu terkait. In 1802 Gian Domenico Romagnosi suggested the relationship between electric current and magnetism, but his reports went unnoticed. Pada tahun 1802 Gian Domenico Romagnosi menyarankan hubungan antara arus listrik dan magnet, tetapi laporannya tanpa terasa. In 1820 Hans Christian Ørsted performed a widely known experiment on man-made electric current and magnetism. Pada tahun 1820 Hans Christian Ørsted melakukan percobaan secara luas dikenal di magnet buatan manusia saat ini dan listrik. He demonstrated that a wire carrying a current could deflect a magnetized compass needle. Ia menunjukkan bahwa kawat yang membawa arus bisa membelokkan sebuah magnet
