Resistance is a physical property that quantifies how strongly a material opposes the flow of electric current. In relation to sensors and resistors, resistance is fundamental in converting physical phenomena (such as temperature, light, or pressure) into electrical signals that can be measured and analyzed. In resistors, resistance is determined by the material's properties, its length, and cross-sectional area. In sensors, changes in resistance are used to indicate changes in the physical condition being monitored. SI unit of resistance is Ohm (Ω).