7.Transistor as an amplifier | npn transistor

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In this video we will learn transistor as an amplifier
How this transistor works as an amplifier..
To use transistor as an amplifier we use it in common emitter configuration and in active region . the small change(uA) in base current will result in high current(mA) in collector current . using this property of transistor we will use it as an amplifier.
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