Junction Transistors

A p

A p-n-p transistor has a thin n-type base between two p-type regions called emitter and collector. An n-p-n transistor has a thin p-type base between

The emitter supplies majority carriers

The emitter supplies majority carriers, the base controls their passage, and the collector collects most of the carriers that cross the base.

In a p

In a p-n-p transistor, the emitter is positive and the collector is negative with respect to the base. The emitter-base junction is forward biased and

In an n

In an n-p-n transistor, the emitter is negative and the collector is positive with respect to the base. The emitter-base junction is forward biased an

In a p

In a p-n-p transistor, holes are the charge carriers inside the transistor and electrons are the charge carriers in the external circuit. In an n-p-n