What does the symbol Ω represent?

The symbol Ω is universally recognized as the symbol for the ohm, which is the unit of electrical resistance in the International System of Units (SI). Resistance measures how much an object opposes the flow of electric current. In this context, understanding the significance of the ohm is crucial for those in the electrical field, as it directly relates to Ohm's Law, which states that voltage equals current multiplied by resistance (V = I × R).

Recognizing that the other units represent different electrical concepts further emphasizes the role of the ohm. The volt is a measure of electric potential, the ampere represents the flow of electric current, and the watt measures electrical power. Each of these plays a distinct role in electrical systems, but the specific function of the ohm pertains to resistance, making it the correct answer in this context.