Carbon-composition resistors dissipate power according to how big, physically,they are. Most of the carbon-composition resistors you see in electronics stores canhandle1⁄4 W or 1/2 W. There are 1/8-W units for miniaturized, low- power circuitry, and1-W or 2-W components for circuits where some electrical ruggedness is needed. Occa-sionally you’ll see a much larger unit, but these are rare.The wirewound resistorA more obvious way to get resistance is to use a length of wire that isn’t a good con-ductor. Nichrome is most often used for this. The wire can be wound around a cylindri-cal form, like a coil (Fig. 6-6). The resistance is determined by how well the wire metalconducts, by its diameter or gauge, and by its length. This component is called a wire-wound resistor.The wirewood resistor1036-5Construction of a carbon-composition resistor.6-6Construction of a wirewound resistor.