Ma'am could you explain me construction of amplifier using Common emitter transistor

The input to the CE (common emitter) is applied to the base-emitter circuit and the output is taken from the collector-emitter circuit, making the emitter the element "common" to both input and output. The CE is set apart from the other configurations because it is the only configuration that provides a phase reversal between input and output signals.

The construction is illustrated with following diagram, C's are the capacitors and R's are the resistors.

Yes, base and collector are reverse biased.

Regards,

Team,

TopperLearning.