What is the unit of electrical resistance?

The unit of electrical resistance is the ohm. This unit measures how much a material opposes the flow of electric current. According to Ohm's law, resistance can be described through the relationship between voltage, current, and resistance, expressed by the formula:

Voltage (V) = Current (I) x Resistance (R).

In this context, ohms are the specific unit that quantifies resistance in this equation.

Understanding the other units provides further context: a watt is a unit of power, indicating the rate of energy consumption; a volt measures electric potential or voltage; and an ampere refers to the flow of electrical charge or current. Each of these units plays a distinct role in electrical engineering, but it is the ohm that specifically addresses the concept of resistance.