Kinds of Materials

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There are three kinds of materials

  1. Conductors
  2. Insulators
  3. Semiconductors

Conductors

All materials having less than 4 valance electrons are called conductors. They present no resistance against electric current. e.g.  Iron, Gold, Silver etc.

Insulators

All materials having more than 4 valance electrons are called Insulators. They present high resistance against electric current. e.g.  Paper, Plastic, Rubber, wood etc.

Semiconductors

All materials having exact 4 valance electrons are called semiconductors. They present medium  resistance against electric current. e.g. silicon, germanium  etc.

 

 



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