What is the unit of electrical resistance?

The unit of electrical resistance is the Ohm, which is represented by the symbol Ω. Resistance is a measure of how much a material opposes the flow of electric current. According to Ohm's Law, the resistance (R) in a circuit can be expressed as the ratio of voltage (V) across an element to the current (I) flowing through it, represented by the formula R = V/I.

Understanding resistance is essential in electrical circuits because it helps determine how much current will flow for a given voltage. The other options represent different electrical units: the Ampere is a unit of current, the Volt is a unit of electrical potential or voltage, and the Watt is a unit of power, which is the rate at which electrical energy is consumed or produced. Therefore, the Ohm stands out as the specific unit that quantifies electrical resistance distinctly from these other electrical properties.