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Semiconductors

Semiconductors are materials consisting of elements from group IV of the periodic table and having electrical properties falling somewhere between those of conducting and of insulating materials.

Aconducting material is characterized by a large number of conduction-band electrons, which have a very weak bond with the basic structure of the material.

Static Switches

Because the power devices can be operated as static switches or contactors, the supply to these switches could be either ac or dc and the switches are known as ac static switches or dc switches.