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Junction Transistors

ICSE · Class 12 · Physics

Flashcards for Junction Transistors — ICSE Class 12 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.

53 questions35 flashcards5 concepts

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35 Flashcards
Card 1Introduction to transistor

State the definition of a transistor.

Answer

A transistor is the device consisting of two p-n junctions and replaces the vacuum triode valve. It was invented in 1948 by Bardeen, Shockley and Barattain in USA.

Card 2Origin of the term transistor

Why is a transistor called a transistor?

Answer

The term comes from TRANSFER and RESISTOR. It is used because a transistor transfers an input signal current from a low resistance circuit to a high resistance circuit.

Card 3p-n-p transistor structure

Describe the structure of a p-n-p transistor.

Answer

A p-n-p transistor has a very thin n-type base sandwiched between two p-type blocks. The emitter and collector are the outer regions, and the base is the central thin region.

Card 4n-p-n transistor structure

Describe the structure of an n-p-n transistor.

Answer

An n-p-n transistor has a very thin p-type base sandwiched between two n-type blocks. The emitter and collector are the outer regions, and the base is the central thin region.

Card 5Transistor symbol

What does the arrow direction in a p-n-p transistor symbol indicate?

Answer

The arrow points towards the base. It indicates the direction of conventional current, that is, the direction of flow of holes.

Card 6Transistor symbol

What does the arrow direction in an n-p-n transistor symbol indicate?

Answer

The arrow points away from the base. It indicates the direction of conventional current, which is opposite to the direction of flow of electrons.

Card 7Transistor regions

State the roles of emitter, base, and collector.

Answer

Emitter is heavily doped and supplies majority carriers. Base is thin and lightly doped and controls the passage of charge carriers. Collector is less heavily doped than the emitter and collects major…

Card 8Transistor comparison

Why is n-p-n transistor preferred for amplification?

Answer

In n-p-n transistor, current flow is mainly due to electrons, while in p-n-p transistor it is mainly due to holes. Since electrons have much greater mobility than holes, n-p-n transistor is more effic…

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Junction Transistors covers several key topics that are frequently asked in ICSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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Understand the core concepts first, then work through the 53 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
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