The term 'measure of resistance' refers to a unit of measurement used to quantify the opposition that a circuit presents to the flow of an electric current. The two most common units of measure for resistance are ohmage (6 letters) and ohm (3 letters). Ohmage is a unit of electrical resistance equal to one million ohms, while an ohm is the SI unit of electrical resistance equal to the resistance between two points on a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere.