Question

How does current flow in a PNP transistor?

Answer 1

Explanation:

1. The passage of charge from a point of low potential to a point of higher potential is known as current in the Transistor.
2. In an NPN transistor, where there are more electrons than holes, the majority charge carrier is an electron and the minority charge carrier is a hole.
3. In a PNP transistor, electrons form a minority of the charge carriers, while holes constitute the majority. This is a consequence of the fact that when an atom of an element with three valence electrons (boron) is doped into a silicon atom, leaving one hole open after the other three electrons have bonded with other holes, a p-type semiconductor material is made for the net positive charge gained through additional holes, It has an electric charge.
4. In a PNP transistor, the current travels from the emitter to the collector. The PNP transistor's letter designates the voltage needed by the emitter, collector, and base of the transistor. The base of a PNP transistor has always been negative in relation to the emitter and collector.

Hence, the PNP transistor's current flow is defined as the migration of holes from the strongly doped emitter across the junction to the negative supply voltage.