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. In electrical circuits, resistance is a crucial factor because it affects how much current flows for a given voltage according to Ohm's Law, which states that voltage equals current multiplied by resistance (V = I × R).

Understanding resistance is essential for anyone working with electrical systems, as it directly impacts the performance and efficiency of electrical appliances and devices. The Ohm is symbolized by the Greek letter omega (Ω) and is foundational in various fields including electronics and electrical engineering. This makes it a key component in understanding how electrical systems function, making the Ohm the correct answer to the question regarding the unit of electrical resistance.