What is the basic constitutional unit in the electronic circuit?

$A$ $N-P-N$ transistor is connected in common emitter configuration (see figure) in which the collector voltage drop across the load resistance $(800 \; \Omega)$ connected to the collector circuit is $0.8 \; V$. The collector current is .............. $mA$.

An oscillator is nothing but an amplifier with

For a transistor in $CE$ mode to be used as an amplifier,it must be operated in:

In a $p-n-p$ transistor, the current carriers are

$A$ transistor is operating in the active mode. $v_1$ is the potential barrier across the base-emitter junction and $v_2$ is the potential barrier across the collector-base junction. $b_1$ is the width of the depletion layer of the base-emitter junction and $b_2$ is the width of the collector-base junction.