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What term refers to holes and electrons in the operation of a transistor?
Wiki User
∙ 10y ago
current carriers
Wiki User
∙ 10y ago
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What is the number of free electrons and holes in a pure semiconductor at 0k?
There are no free electrons and holes in a pure semiconductor at 0k.
What does an emitter resistor do?
The emitter of a bipolar transistor (junction or point contact type) emits charge carriers(electrons in an NPN, holes in a PNP) through the base towards the collector.
Why is the base lightly doped in a tranistor?
Since the base in an n-p-n transistor is kept very thin, very few electrons get to recombine with holes and escape out of base, most of the electrons are injected from emitter into the collector. As a result, Base-current is very small. Whereas the Collector-current is almost equal to the Emitter-current.
If a pure Si crystal has a million free electrons inside it how many holes does it have.what happens to the no of free electrons and holes if the ambient temperature increases?
If the crystal is pure Si (no dopants or impurities) then the number of free electrons in the conduction band will be equal to the number of holes in the valence band. Each electron leaves behind a hole when it is thermally excited into the conduction band. If the ambient temp. increases, there will be more thermal energy available which will increase both the number electrons and the number of holes.
What is the difference between power transistor and power mosfet?
A BJT is one type of transistor and POWER TRANSISTOR can be BJT or MOSFET or some other phenomena.POWER TRANSISTOR are usually those who are used at high current ratings e.g at POWER AMPLIFIER where large transistors are used at final stage to gain output.
Why high noise in bipolar junction transistor?
In the case of Bipolar Junction Transistor current conduction is due to both holes and electrons. That's why noise is high in Bipolar Junction Transistor
Why npn transistor are more using than pnp transistor. Give two reasons?
1. NPN transistors current conductin is by electrons and conventional current flow will be in the opposite direction. 2. Majority charge carriers are electrons whose mobility is almost double than that of holes.
Why you use NPN transistors rather than PNP?
Switching is faster in NPN transistor than PNP. Because movement of electrons is faster than holes.
Why transistor is called transistor?
Because in this device the resistance between two terminal respectively collector and emitter is changed by changing the base voltage that is it transfers the resistance between emitter and collector therefore it is called as TRANSISTOR. (TRANSFER OF RESISTOR)
How is the NPN transistor different from the PNP transistor?
"P" is for Positive and "N" is for Negative So basically put a PNP Transistor Would use N to Switch P, in the name "PNP" or "NPN" the first character is for the polarity of the Collector-pin, the second for the Base-Pin, and the third for the Emmiter-pin. So if you have a PNP Transistor you can`t just replace it with an NPN as the polarities differ. If you can find a way to change those polarities then sure it could work. The Collector-pin basically receives the bigger current. The Base-pin determines how much of that current will be transferred to the emmiter-pin. So in a PNP the base current could for example be 0V and the Collector 5V, this will allow a free flow of current from Collector to Emmiter, the usage of a transistor in many cases is to switch high current with lower current. The main difference is that a PNP transistor uses "holes" as carriers and an NPN transistor uses electrons as carriers (It is to be remembered that the flow of current is always in the direction opposite to that of the flow of electrons). The difference in the symbol for the two transistors are that the PNP transistor will have an arrow pointed to the base from the emitter, and the NPN has it pointing outside.
Which has greater mobility in intrinsic semiconductor Electrons or holes?
The mobility of electrons is always greater than holes. Only the number of electrons and holes would be same in an intrinsic semiconductor.
What is Bipolar devices vs unipolar devices?
As the name certifies unipolar is having two types of carriers i.e holes and electrons but in the operation of the devise only one can take part in the mobility i.e negatively charged electrons or holes but in contrast to this in bipolar both two participate in the carrier.
What are the majority carriers in the base region of an npn transistor?
holes are majority in base
Why is collector region is greater than emitter region?
the collector is where we are getting the the holes or electrons from the emiiter through the base (wrt to the transistor we use). As the carriers are collected there,most heat is dissipited there. so it must be of large size
What is the number of free electrons and holes in a pure semiconductor at 0k?
There are no free electrons and holes in a pure semiconductor at 0k.
Why transistor is called as bi-polar device?
Transistor is called Bi-Polar device because the current can be flow due to electron and holes, hence it is called bipolar.
What voltage bias conditions are required to bias a pnp transistor into the possible different modes of operation?
due to he placement of the sun, and the temperature of sasquaches beard (aka his entire body) i would say the answer is at the bottum of the ocean. I bit lots of holes in its life raft.
