Content Curator
NPN transistors are those that have one p-type material sandwiched between two n-type materials.
- A transistor is a semiconductor device that transfers a weak signal from a low-resistance circuit to a high-resistance circuit.
- The terms “trans” and “istor” refer to the resistance properties provided by junctions.
- In other terms, it is a switching device that controls and amplifies electrical signals such as voltage or current.
- The NPN transistor amplifies the weak signal that enters the base and generates high-amplitude impulses at the collector end.
- In an NPN transistor, an electron moves from the emitter to the collector region, causing current to flow through the transistor.
- This type of transistor is commonly used in circuits because its majority charge carriers are electrons, which have more mobility than holes.
Ques. What is an NPN transistor?
Ans. An NPN transistor is a type of transistor that can be formed when a p-type semiconductor is sandwiched between two n-type semiconductors. In NPN transistors, electrons constitute the majority charge carriers while holes constitute up the minority charge carriers.
Ques. What is a transistor?
Ans. The semiconductor device known as a transistor is used to switch or amplify electrical signals. It is one of the basic elements of modern electronics. It has at least three terminals for connecting to an electronic circuit and is made of semiconductor material.
Ques. Define bipolar junction transistors.
Ans. A type of transistor that uses both electrons and electron holes as charge carriers is known as a bipolar junction transistor. A unipolar transistor, like a field-effect transistor, uses just one type of charge carrier in contrast.
Ques. Who invented the transistor?
Ans. The point-contact transistor, invented in 1947 at Bell Labs by John Bardeen, Walter Brattain, and William Shockley, was the first operational transistor.
Ques. What are the two types of transistors?
Ans. The two types of transistors are
- Field effect transistors (FET)
- Bipolar transistors (BJT)
Ques. What is a PNP transistor?
Ans. A PNP transistor is a semiconductor manufactured by sandwiching two identical P-type doped semiconductors between an N-type doped semiconductor. It is a bipolar junction transistor (BJT).
Ques. What are the three terminals seen in the Field Emitter Transistor (FET)?
Ans. The source, gate, and drain terminals of Field Effect Transistors (FET) are the three terminals.
Ques. Where are transistors used?
Ans. Transistors are used in amplifiers, oscillators, and switches.
Ques. What are the three terminals of the transistor?
Ans. The three terminals of a transistor are the emitter, base, and collector.
Ques. What is the output resistance of a transistor?
Ans. The output resistance of a transistor is the resistance that it presents to its load. It is also known as the dynamic collector resistance or the collector output resistance.
Ques. What is the input resistance of a transistor?
Ans. The input resistance of a transistor is the resistance that it presents to its input signal. It is also known as the dynamic base resistance or the base input resistance.
Ques. What is the function of the collector terminal?
Ans. The collector terminal collects the electrons that flow from the emitter.
Ques. What are the different sections of the semiconductor junction transistor?
Ans. The semiconductor junction transistor is divided into three sections: emitter, base, and collector.
Ques. What is the formula to calculate the current gain?
Ans. The formula to calculate the current gain of a transistor is given by
Π = ΔIc/ΔIb
Ques. What are the different ways to use transistors?
Ans. The following are the ways to use transistors
- Common base configuration
- Common collector configuration
- Common emitter configuration
Ques. Define input junction and output junction.
Ans. The input section of a transistor's common-emitter circuit is composed of the emitter-base and the output section is composed of the emitter-collector. The base junction (input junction) is forward-biased, as is the collector junction (output junction).
Ques. How are three sections arranged in a transistor?
Ans. The base consists of a thin layer of a particular kind of extrinsic semiconductor sandwiched between two sections of second-type extrinsic semiconductors on either side. The three parts of a transistor are organized in the following ways.
Ques. What is the difference between a BJT and a FET?
Ans. A BJT is a current-controlled device, while a FET is a voltage-controlled device. This means that the current flowing through a BJT is controlled by the current flowing through its base, while the current flowing through a FET is controlled by the voltage applied to its gate.
Ques. What is the function of the emitter terminal?
Ans. The emitter terminal is responsible for injecting electrons into the transistor.
Ques. What is the voltage gain of a transistor?
Ans. The voltage gain of a transistor is the ratio of the collector voltage to the emitter voltage. It is also known as the alpha (α) of the transistor.
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