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Junction Transistors — Flashcards

ICSE · Class 12 · Physics

35 flashcards for Junction Transistors (ICSE Class 12 Physics) to test yourself on key terms and facts. Sample: "State the definition of a transistor."

53 questions35 flashcards7 formulas & key relations5 concepts

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35 Flashcards·
Introduction to transistorOrigin of the term transistorp-n-p transistor structuren-p-n transistor structureTransistor symbolTransistor regionsTransistor comparison
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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Frequently Asked Questions

What are the important topics in Junction Transistors for ICSE Class 12 Physics?
Key topics in Junction Transistors include Basic idea of a junction transistor, Types of transistors and symbol directions, Transistor action and current relation, Current gain and related parameters. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many flashcards are available for Junction Transistors?
There are 35 flashcards for Junction Transistors covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Junction Transistors for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 53 practice questions on Junction Transistors. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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