What is an amplifier?

Draw the circuit of a transistor as an amplifier.

Discuss the working of n-p-n transistor as an amplifier in common base mode.

Discuss the working of p-n-p transistor as an amplifier in common emitter mode.

Fill in the blanks: For using a transistor as an amplifier, the base emitter junction is ……………. Biased and the base collector junction is …………… biased. (forward, reverse, forward, reverse)