Bakana iwo ina ti a mo ni sisan atanna ninu okun onirin, fun apere awon waya opo ina to n gbe ina lati ibikan de ibo miran ati awon waya kekeke ninu awon ero onina (electronics), ati bi atanna se n san koja ninu adena ina (resistor), sisan kiri ioni (ion) ninu batiri (battery) ati sisan kiri iho ninu agbeinadie (semiconductor).Inagberingberin (electromagnetism) Iwo ina n pese papa gberingberin (magnetic field).. 
1951) 1869 - Henry Joseph Wood, English Conductor (D.. 