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Conductor, Semi-Conductor, Insulator

Super Conductor eg. Yttrium

Conductor eg. Silver, Copper, Aluminium

Semi Conductor eg. Silicon

Insulator eg. Ceramic, Plastic, Wood

Semi Conductor
normally between Collector and Emitter there is no electric flow but if we apply electricity at Base there can be electric flow between Collector and Emitter then it acts as a conductor.

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