Electrical resistance is a measure of the opposition to the flow of electric current in a conductor. It is determined by the material's properties, such as its length, cross-sectional area, and temperature. The unit of resistance is the ohm, represented by the symbol Ω. Higher resistance means less current flows for a given voltage, according to Ohm's Law. In practical terms, electrical resistance plays a crucial role in designing electrical circuits and devices. For example, resistors are components specifically designed to provide a certain amount of resistance, helping to control current flow and protect sensitive components from damage.