Conductors and Insulators 

 Conductors 

Materials through which charge flows easily are called conductor.

Examples: Include metals, such as silver, gold, copper, and aluminum. Copper is used extensively for the conductive paths on electric circuit boards and for the fabrication of electrical wires.

Insulators

 materials are that do not allow charge to move easily.

 Examples

  Include glass, plastic, ceramics, and rubber. Electric current cannot be flow through an insulator, since a charge has great difficulty moving through it. One sees insulating (or dielectric) materials often wrapped around the center conducting core of a wire.

One can say qualitatively that a ‘conductor’ has a very low resistance to the flow of charges, whereas an ‘insulator’ has a very high resistance to the flow of charge. Charge-conducting abilities of various materials vary in a wide range ‘Semiconductors’ I will descried in details.