Question

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Explain the working of n-p-n transistor​

Answer 1

Answer:

In NPN transistor, the direction of movement of an electron is from the emitter to collector region due to which the current constitutes in the transistor. Such type of transistor is mostly used in the circuit because their majority charge carriers are electrons which have high mobility as compared to holes.

Answer 2

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Transistors make our electronics world go 'round. They're critical as a control source in just about every modern circuit. Sometimes you see them, but more-often-than-not they're hidden deep within the die of an integrated circuit. In this tutorial we'll introduce you to the basics of the most common transistor around: the bi-polar junction transistor (BJT).

Introduction image

In small, discrete quantities, transistors can be used to create simple electronic switches, digital logic, and signal amplifying circuits. In quantities of thousands, millions, and even billions, transistors are interconnected and embedded into tiny chips to create computer memories, microprocessors, and other complex ICs.

Covered In This Tutorial

After reading through this tutorial, we want you to have a broad understanding of how transistors work. We won't dig too deeply into semiconductor physics or equivalent models, but we'll get deep enough into the subject that you'll understand how a transistor can be used as either a switch or amplifier.

This tutorial is split into a series of sections, covering:

Symbols, Pins, and Construction -- Explaining the differences between the transistor's three pins.

Extending the Water Analogy -- Going back to the water analogy to explain how a transistor acts like a valve.

Operation Modes -- An overview of the four possible operating modes of a transistor.

Applications I: Switches -- Application circuits showing how transistors are used as electronically controlled switches.

Applications II: Amplifiers -- More application circuits, this time showing how transistors are used to amplify voltage or current.

There are two types of basic transistor out there: bi-polar junction (BJT) and metal-oxide field-effect (MOSFET). In this tutorial we'll focus on the BJT, because it's slightly easier to understand. Digging even deeper into transistor types, there are actually two versions of the BJT: NPN and PNP. We'll turn our focus even sharper by limiting our early discussion to the NPN. By narrowing our focus down -- getting a solid understanding of the NPN -- it'll be easier to understand the PNP (or MOSFETS, even) by comparing how it differs from the NPN.

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