The ________ is a unit of resistance.

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Resistance is measured in ohms. An ohm is defined as the resistance between two points of a conductor when a constant potential difference of one volt, applied to those points, produces a current of one ampere. In other words, R = V / I, so one ohm equals one volt per ampere. The other units shown correspond to current (ampere), voltage (volt), and power (watt), not resistance. So the unit that describes resistance is the ohm.