The term 'electrical units of resistance' refers to the measure of opposition to the flow of an electric current, which is measured in ohms (Ω). Ohms are a unit of electrical resistance, named after the German physicist Georg Ohm. Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. This law is used to calculate the resistance of a material, which is measured in ohms.