A resistor ((Ω) symbol)) is an electronic component that resists, restricts, or opposes the flow of current. It can be visualized as constriction or narrowing in a pipe, where the constricted area is the resistance (resistor), and the flow of water is current. The volume of water flow following a constriction in a water pipe is reduced. The resistive property of this type of component can be attributed to a material which has much lower electrical conductivity than regular conductive materials such as metals.