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Transistor, Collector, Base, Emitter, pnp-transistor-symbol, npn…
Transistor
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Transistor as a switch
One of the most common uses for transistors in an electronic circuit is as simple switches. In short, a transistor conducts current across the collector-emitter path only when a voltage is applied to the base. When no base voltage is present, the switch is off. When base voltage is present, the switch is on.
A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. This forward bias is maintained regardless of the polarity of the signal.
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Collector
The collector-base junction is always in reverse bias. Its main function is to remove the majority charges from its junction with the base
Base
The base of the transistor is lightly doped and very thin due to which it offers the majority charge carrier to the base.
Emitter
The emitter is alway connected in forward biased with respect to the base so that it supplies the majority charge carrier to the base.
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