When transistor is used as an amplifier
electrons move from base to collector
holes move from emitter to base
electrons move from collector to base
holes move from base to emitter.
As we have learnt,
Transistor -
Three layered semiconducting device .
NPN or PNP
- wherein
1. Emitter is heavily doped
2. collector is moderately doped .
3. Base is lightly doped & very thin
In npn transistor electron will move from emitter to base then same electron comming from emitter towards base will move to collector.
Option 1)
electrons move from base to collector
Option 2)
holes move from emitter to base
Option 3)
electrons move from collector to base
Option 4)
holes move from base to emitter.
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