the transfer of the resistor
Resistor
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Resistors act to reduce current flow, and, at the same time, act to lower voltage levels within circuits. In electronic circuits, resistors are used to limit current flow, to adjust …
What in junction transistor?
what in junction transistor ? 2 types of transistor. What is Junction Transistor? NPN transistor and PNP transistor. Ordinarily, junction transistor is a three terminals Semiconductor device.
What is a transistor and how it is formed?
A transistor is formed when a thin layer of one type of the intrinsic semiconductor is sandwiched between two thick layers of other types of extrinsic semiconductors. 1. When a thin layer of p-type semiconductor is sandwiched between two thick layers of n-type semiconductor we get a junction transistor which is known as NPN transistor.
Why are transistors used as amplifiers and switches?
The transistors can be used as an amplifier or as an electronic switch. the transfer of the resistor is a transistor – the base-emitter junction is directly polarized and therefore has a low resistance to the conduction of the emitter at the base the base collector junction is reverse biased and therefore has a high resistance.
Why Bipolar junction transistor is called current operated device?
When bipolar junction transistor(BJT) is operated under proper biasing large current flows through the BJT,thus it is called current operated device. What are the functions bipolar junction transistor?
What is the meaning of junction transistor?
Understanding Junction Transistors A Bipolar Junction Transistor (BJT) is a three-terminal semiconductor device that consists of two p-n junctions and are able to amplify or magnify a signal. A BJT is a current controlled device. A bipolar junction transistor has three terminals: emitter, base and collector.
Why is it called bipolar?
The name "bipolar" comes from the fact that this type of transistor contains two types of semiconductor material—one positive type (p-type) and one negative type (n-type)—through which a current flows. Bipolar junction transistors usually contain silicon.
What transistor is called bipolar?
Bipolar transistors are a type of transistor composed of pn junctions, which are also called bipolar junction transistors (BJTs). Whereas a field-effect transistor is a unipolar device, a bipolar transistor is so named because its operation involves two kinds of charge carriers, holes and electrons.
Why MOSFET is called unipolar device?
FETs are also known as unipolar transistors since they involve single-carrier-type operation. That is, FETs use either electrons (n-channel) or holes (p-channel) as charge carriers in their operation, but not both.
Why are diodes unipolar?
Detailed Solution. In a unipolar device, the current is due to only one type of carrier (i.e. electrons or holes), while in a bipolar device current is due to both holes and electrons. The Schottky diode or hot-carrier diode is a junction of n-type semiconductor and metal, in it, electrons are sole carriers.
What is the smallest region in a transistor?
The base current IB is always the smallest. The collector current IC and emitter current IE are relatively close in magnitude. 7.
What is NPN and PNP transistor?
An NPN transistor has a piece of P-type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed. Below is a typical cross section of a transistor.
Why is base width small?
The width of the region depends upon their doping. The base region is lightly doped so that width of the base is less. Collector region of a transistor is highly doped so collector region has more width than other two.
Do bipolar people know they are bipolar?
A person with bipolar disorder may be unaware they're in the manic phase. After the episode is over, they may be shocked at their behaviour. But at the time, they may believe other people are being negative or unhelpful. Some people with bipolar disorder have more frequent and severe episodes than others.
Why did they change manic depression to bipolar?
The term manic depression was changed to bipolar disorder with the 1980 publication of the third revision of the "Diagnostic and Statistical Manual of Mental Disorders."1 The term manic-depressive and manic had become highly stigmatized, so changing the label was intended to help minimize negative attitudes toward the ...
What are the 4 types of bipolar?
4 Types of Bipolar DisorderSymptoms include:Bipolar I. Bipolar I disorder is the most common of the four types. ... Bipolar II. Bipolar II disorder is characterized by the shifting between the less severe hypomanic episodes and depressive episodes.Cyclothymic disorder. ... Unspecified bipolar disorder.
Is bipolar 1 or 2 worse?
Both Types Should Be Properly Treated Since hypomania that occurs in bipolar II is less severe than the mania that occurs in bipolar I disorder, bipolar II is often described as "milder" than bipolar I—but this is not completely accurate.
What is a BJT and a FET?
BJT is a three terminals device, terminal named as emitter, base and collector, FET is also a three terminal device and terminals are named as source, drain, and gate. In BJT Emitter and collector is not interchangeable but in FET source and drain are interchangeable. FET can be made quite small as compared to BJT.
Why is a BJT bipolar?
A BJT is called as Bipolar because it has pn junctions present inside it. In case of pn junction when it is forward biased the holes travel from p-region to n-region whereas electrons travel from n-region to p-region. So, we can say that conduction is due to both electrons and holes. So, in whichever device there is pn-junction in the path ...
Is a BJT a field effect transistor?
BJT is bipolar (Current flows due to both electron and hole carriers) and Field effect transistor (FET) is unipolar (Current flows due to majority carrier i.e. Electron for N-type FET and hole for P-type FET). BJT is a current controlled device but Field effect transistor is a voltage controlled device.
Is a transistor a resistor?
A transistor is just like a variable resistor, but instead of a dial, its resistance is controlled by the small current that flows into its base terminal: Here, Rc is the same resistor as R1 in the preceding diagrams, but R2 is now a transistor.
Is BJT a bi junction?
BJT is also a bi-junction Transistor because it has two pn-junctions present out of which one is the Base-Emitter Junction and other is the Base-Collector Junction and hence the word junction appears in the name. Transistor implies transfer of resistance that is one quantity at input controls the quantity at the output terminals which like in case ...
Is BJT louder than FET?
BJT is more noisy than FET due to its junctions. FET is a better amplifier than BJT, but BJT is a better switch than FET. Input Impedance of FET is very high as compared to BJT specially of MOSFET’s. BJT has more gain bandwidth product as compared to fet. What is BJT (Bipolar Junction Transistor) Related Answer.
Why are transistors called transistors?
it is nothing more than a semiconductor device through which currents and voltages of the desired magnitude can be obtained.
What is a transistor?
transistor is a combination of the words transfer and resistance called transistor, it is so called because it is a resistor or a semiconductor device capable of amplifying the electrical signals when they are transferred from the input to the output terminals.
What does amplifying a switch do?
By working as a switch and as an amplifier as well, amplifying here means transferring the resistance of the emitter to the collector and the collector base.
What is the ratio of variation of the current of the collector on the variation of the input voltage called?
the ratio of variation of the current of the collector on the variation of the input voltage vbe in a small signal amplifier is called transconductance and conversely, it is the trans resistance
What is the name of the resistor that amplification of the input function?
transistor: as its name comes from resistors with transfer properties or simply amplification of the input function, it is called transfer resistor commonly called transistor. mainly transistors are two types that are pnp and npn.
How many terminals does a transistor have?
the transistor name means approximately trans-resistor, all transistors have three terminals. a terminal is a control terminal. the voltage on the control terminal (or the current flowing in the control terminal) modulates or controls the resistance between the two remaining terminals. hence the name trans-resistance or transistor!
What is the trans prefix?
Therefore, a transistor transfers a signal of low resistance to high resistance. the trans prefix is the transfer property of the device and istor shows that it is the solid element of the same family of resistors.
What is the abbreviation for transistor?
Transistor was an abbreviated combination of the words transconductance (or transfer) and Varistor. Transistor was suggested by John Pierce, a researcher at the lab. The vote was clear--transistor was the name of choice.
Who invented the point contact transistor?
John Pierce named it, according to a PBS documentary in 2000. He worked with Shockley at Bell Labs. Before Shockley sandwiched three semiconductor layers together, the only kind of transistor was the point-contact...uh, not "point contact transistor"! That word wasn't invented yet.
What is the opposite of conductance in vacuum tubes?
The opposite of conductance is resistance.
How many terminals are in a junction transistor?
Ordinarily, junction transistor is a three terminals Semiconductor device. A transistor is formed when a thin layer of one type of the intrinsic semiconductor is sandwiched between two thick layers of other types of extrinsic semiconductors.
What is a BJT transistor?
In a junction transistor, the current is carried by two types of charge carriers that are holes and electrons, and hence it is known as bipolar junction transistor (BJT). Prove Divergence and Curl of magnetic field.
What is the difference between a base-emitter junction and a base-collector junction?
The base-emitter junction is forward biased to have low resistance for the emitter circuit. The base-collector junction is reverse biased to have high resistance in the collector circuit.
When a thin layer of p-type semiconductor is sandwiched between two thick layers of n-type?
1. When a thin layer of p-type semiconductor is sandwiched between two thick layers of n-type semiconductor we get a junction transistor which is known as NPN transistor.
What is the middle region of an ammeter called?
The middle region which forms two PN junctions between ammeter and collector is called a base . The base is lightly doped and very thin so that the majority carriers may pass easily through the Base collector junction. The base-emitter junction is forward biased to have low resistance for the emitter circuit.
