Classification according to the way materials react to the current when a voltage is applied across them
Insulators
1. Materials with very high resistance
2. Oppose the flow of current (mica , rubber)
Conductors
1. Materials with very low resistance
2. Allow the current ti flow easily (copper, aluminium)
Semiconductors
1. Neither good conductors nor insulators (silicon, germanium)
2. Can be controlled to either insulators by increasing their resistance or conductors by decreasing their resistance
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