The triode made of p and n types of semiconductor is called transistor.
Answers
Explanation:
Are both p-type and n-type used in same transistor?
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The n-p-n junction transistor consists of two n -type semiconductors (called the emitter and collector) separated by a thin layer of p -type semiconductor (called the base). The transistor action is such that if the electric potentials on the segments are properly determined, a small current between the base and emitter connections results in a large current between the emitter and collector connections, thus producing current amplification. Some circuits are designed to use the transistor as a switching device; current in the base-emitter junction creates a low-resistance path between the collector and emitter. The p-n-p junction transistor, consisting of a thin layer of n -type semiconductor lying between two p -type semiconductors, works in the same manner, except that all polarities are reversed.
The Field-Effect Transistor
A very important type of transistor developed after the junction transistor is the field-effect transistor (FET). It draws virtually no power from an input signal, overcoming a major disadvantage of the junction transistor. An n -channel FET consists of a bar (channel) of n -type semiconductor material that passes between and makes contact with two small regions of p -type material near its center. The terminals attached to the ends of the channel are called the source and the drain; those attached to the two p -type regions are called gates. A voltage applied to the gates is directed so that no current exists across the junctions between the p - and n -type materials; for this reason it is called a reverse voltage. Variations of the magnitude of the reverse voltage cause variations in the resistance of the channel, enabling the reverse voltage to control the current in the channel. A p -channel device works the same way but with all polarities reversed.