Electric resistance, denoted as R, quantifies the opposition to the flow of electric current within a material. The formula representing resistance is R = V/I, where V signifies voltage across the material and I represents the current passing through it. This relationship, known as Ohm’s Law, illustrates that resistance is directly proportional to voltage and inversely proportional to current. The unit of resistance is the ohm (Ω). Materials with higher resistance impede the flow of electrons more effectively, converting electrical energy into heat. Resistance plays a critical role in determining how conductive a material is and is fundamental in designing circuits, understanding electrical systems, and evaluating the efficiency of various electronic components like resistors in controlling current flow within a circuit.