In an unbiased PNP transistor, the barrier voltages are ______ on the base and ______ on the emitter and collector.

In an unbiased PNP transistor, the barrier voltages are positive on the base and negative  on the emitter and collector.

Concept:

PNP Transistor:

• PNP transistor is a three-terminal device i.e. base, emitter, and collector.
• The main function of the PNP transistor is amplification.
• For amplification, the base and emitter junction must be forward bias, and the collector and emitter junction must be reverse bias.

Operating modes of transistor:

Additional Information

NPN Transistor:

• An NPN transistor is a Bipolar Junction Transistor consisting of two PN junctions in such as way that a P-type semiconductor sandwiching by two N-type Semiconductors.

• These back to back PN junction diodes are known as the collector-base junction and base-emitter junction.
• The base-emitter junction is always connected in forward bias in Active mode therefore it has a barrier voltage (VBE) of + 0.7 volts for Si and + 0.3 volts for Ge.
• The collector-base junction is always connected in reverse bias in Active mode.
• In this transistor, electrons are the majority carrier for the input current (IE) and holes are the minority carrier.