A measurement of resistance is typically expressed in what unit?

Resistance is a measure of how much a material opposes the flow of electric current. The unit used to quantify this property is the "ohm," which is symbolized by the Greek letter omega (Ω). This unit arises from Ohm's Law, which describes the relationship between voltage (in volts), current (in amperes), and resistance (in ohms) in an electrical circuit. According to the law, resistance can be calculated by dividing voltage by current. This foundational concept in electronics helps technicians and engineers analyze electrical systems effectively, making the understanding and utilization of ohms critical in the field.

The other options, while related to electrical phenomena, represent different concepts: volts measure electrical potential, amperes quantify electric current, and watts represent electrical power. Consequently, the correct unit for measuring resistance remains firmly established as ohms.