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What type of charge carriers the current flows in zener and avalanche breakdown diodes?
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What is meant by drift current in diode?
when ever the external voltage is given the movement of charge carriers produce a current i.e drift current
In direct current charges carries have a drift velocity but in alternating current there is no net velocity of the charge carriers. Explain why?
In direct current the charge carries always flow in the same direction, while in alternating current they change direction repeatedly, meaning overall there is no net direction.
What is unipolar device?
bipolar devices use both majority and minority current carriersunipolar devices use only majority current carriers
What is the current?
Current is defined to be a flow of electrically charged carriers. These are usually electrons or electron-deficient atoms. It is symbolized by uppercase letter I.
How does the current flowing in a conductor depend on the number of mobile charge carriers per unit length on their average velocity on the charge per carrier?
the flowing in the conductor is related as given by the relation... I=Vena v=drift velocity of electron e=charge on electron n=concentration of electron in the current carrying conductor . a=area
Distinguish between zener avalanche effects?
1. Differentiate Zener breakdown from avalanche breakdown? Zener Breakdown Avalanche breakdown 1.This occurs at junctions which being heavily doped have narrow depletion layers 2. This breakdown voltage sets a very strong electric field across this narrow layer. 3. Here electric field is very strong to rupture the covalent bonds thereby generating electronhole pairs. So even a small increase in reverse voltage is capable of producing large number of current carriers. ie why the junction has a very low resistance. This leads to Zener breakdown. 1. This occurs at junctions which being lightly doped have wide depletion layers. 2. Here electric field is not strong enough to produce Zener breakdown. 3. Her minority carriers collide with semi conductor atoms in the depletion region, which breaks the covalent bonds and electron-hole pairs are generated. Newly generated charge carriers are accelerated by the electric field which results in more collision and generates avalanche of charge carriers. This results in avalanche breakdown.
What is the dependence of reverse saturation current in a P-N diode on applied voltage and temperature?
In a PN junction diode, the reverse current is due to the diffusive flow of minority electrons from the p-side to the n-side and the minority holes from the n-side to the p-side. Hence IS, reverse saturation current depends on the diffusion coefficient of electrons and holes. The minority carriers are thermally generated so the reverse saturation current is almost unaffected by the reverse bias but is highly sensitive to temperature changes. so , as the temperature increases the density of minority charge carriers increases creating a slight increase in the amount of IC.so, the inference is reverse current is directly proportional to temperatureIn the reverse biased condition the PN diode is least dependent on voltage till certain limit called breakdown voltage, till that voltage the increase in V is not actually increasing the current it is just increasing the heat at the junction which in turn raises the temperature and so the minority charge carriers.But if the voltage increases the breakdown voltage the pn junction is lost and all the holes and electrons will start acting like charge carriers , such avalanche of charge carriers increases the current sharply to several hundred times. This phenomena is called as zener or avalanche breakdownso if applied voltage less than breakdown voltageno significant change in reverse current(only due to minority charge carriers)and if applied voltage greater than breakdown voltagethe pn junction break and current increases sharply (both due to minority and majority charge carriers)
What current consists of imaginary carriers of positive charge?
Conventional current consists of imaginary carriers of positive charge.
How current pass in pickle?
A current needs a charge carrier. In biological tissue, such charge carriers would usually be ions, from dissolved salts.
How does a electric current flow through a circuit?
If a voltage is applied, electrons (or other charge carriers) are subjected to an attraction towards one side, and a repulsion from the opposite side. This results in the current, i.e., the flow of charge carriers.
How does a electrical current flows through a circuit?
If a voltage is applied, electrons (or other charge carriers) are subjected to an attraction towards one side, and a repulsion from the opposite side. This results in the current, i.e., the flow of charge carriers.
What is meant by drift current in diode?
when ever the external voltage is given the movement of charge carriers produce a current i.e drift current
Define reverse saturation current?
In diode some current flows for the presence of the minority charge carriers. This current is known as reverse saturated current. This is generally measured by picoampere. This current is independent of reverse voltage. It only depends on the thermal excitation of the minority carriers
How does voltage cause current to do work?
A voltage will cause electrons or other charge carriers to flow (if there is a path through which they can flow). In other words, it will cause a current.
How does a voltage cause current to do work?
A voltage will cause electrons or other charge carriers to flow (if there is a path through which they can flow). In other words, it will cause a current.
In the process of electrolysis current can flow through a liguid because?
because of the presence of charge carriers called ions in liquids.
What are majority and minority charge carriers in semiconductors?
There are two recognized types of charge carriers insemiconductors. One iselectrons, which carry a negativeelectric charge. In addition, it is convenient to treat the traveling vacancies in thevalence bandelectron population (holes) as the second type of charge carrier, which carry a positive charge equal in magnitude to that of an electron
