Pelu awon irin-ise to da fun ra re, Ohm wadaju pe iseepin taara wa larin iyato alagbara (potential difference tabi voltage ni ede Geesi) to je mimulo rekoja opa agbena kan ati  iwo onitanna to waye.. 
Erin (4) jẹ́ nọmba, iye ati ohunomiph to duro fun nọmba naa.. 