What is the unit of electrical resistance?

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Resistance is measured in ohms (Ω). The ohm is defined as the resistance between two points of a conductor that, when a constant potential difference of one volt is applied, produces a current of one ampere. In practical terms, resistance relates voltage and current by R = V / I. For example, with 12 volts across a component drawing 2 amperes, the resistance is 6 ohms. Volts describe electrical pressure, amperes describe how much current flows, and watts describe power, so they pertain to different quantities.