In order to use the transistor as an amplifier, it has to operate in the ________ region.

EXPLANATION:

• The supply of suitable external DC voltage is called biasing.
• Either forward or reverse biasing is done to the emitter and collector junctions of the transistor.
• These biasing methods make the transistor circuit work in four in four kinds of regions such as 

1. Active region:

• This is the region in which transistors have many applications. This is also called a linear region. A transistor while in this region, acts better as an Amplifier.

2. Saturation region:

• This is the region in which the transistor tends to behave like a closed switch. The transistor has the effect of its collector and emitter being shorted. The collector and emitter currents are maximum in this mode of operation.

3. Cutoff region:

• This is the region in which the transistor tends to behave as an open switch. The transistor has the effect of its collector and base being opened. The collector, emitter, and base currents are all zero in this mode of operation.

4. Inverse active region or Switched region:

• Hence the correct option is the Active region.