Solid materials exhibit an amazing range of electrical conductivities,extending over 27 orders of magnitude. One way of classifying solid materials is according to the ease with which they conduct an electric current: ▣Conductors 107(0-m)-1 ▣Semiconductors 10-6-104(2-m)-1 ▣Insulators 10-10-10-20(2-m)-1Solid materials exhibit an amazing range of electrical conductivities, extending over 27 orders of magnitude. One way of classifying solid materials is according to the ease with which they conduct an electric current: Conductors 107 (Ω-m)-1 Semiconductors 10-6 -104 (Ω-m)-1 Insulators 10-10 -10-20(Ω-m) -1