What is UJT PNP, NPN transistor & working principles?
Answer / saiful islam
PNP configuration
NPN AND PNP
PNP transistor:
When common base connection of a NPN transistor.In the
forward bias connection of the first PN junction ,it causes
the majority charge carrier(holes) in the P-type ,flow from
emitter to the base region .This constitutes the emitter
current (Ie) in the transistor.As these majority carrier
(hole) cross in to N-type base .They are combine with the
electron .Only the few hole (i.e less than 5%) combine with
the electrons ,because the base of this transistor is
lightly doped and very thin .Expects those holes ,all other
i.e More than 95% cross in to the collector region.This
constitutes collector current (Ic). In this process ,almost
the whole emitter current (holes) flows into the collector
region .So in this transistor ,current conduction in the
circuit is by holes.
Ie=Ic+Ib
Where ,
Ie=emitter current,
Ic=collector current and
Ib=base current
NPN transistor:
When common base connection of a NPN transistor .In the
forward bias connection of the NP junction,it causes the
majority charge carrier(electrons)in the N-type ,flow from
emitter to the base region.This constitutes the emitter
current(Ie) in the transistor.As these majority
carrier(electrons)cross in to the P-type base.They are
combine with the holes.Only the few electrons(i.e less than
5%) combine with the holes ,because of this transistor is
lightly doped and very thin.The remainder i.e more than 95%
cross into the collector region.This constitutes collector
current (Ic).In this way the whole emitter current
(electrons)flows into the collector region .So in this
transistor, current conduction in this circuit is by electrons.
Is This Answer Correct ? | 13 Yes | 5 No |
What do you mean by isolators and circuit breakers?
6 Answers Bhushan Power Steel,
galloping in transmission line is due to
why the the electrical machine coil are damage ? How to prevent it?
How to calculate ant test the burden of Current transformer
Dear all, i completed M.E(Power Electronics & Drives) 2011 passed out having 78% so i need job in core side but i don't know how can i receive the calls from electrical companies and i uploaded my CV in naukri, times jobs etc.. In that iam not recieved any mails from good companies so give me best procedure plzzzzzzzzzzzzzzzzzzzzzzzz..... Thanks, K.Linga Reddy Email-id:-lingareddykmthm@gmail.com Ph no:-08015402078
what is the current carrying capacity of 725 va generator
What happens if 25 Hz frequency is applied for 400/200,50 Hz single phase Transformer.Will Voltage increase ?
2 Answers Bhel, Dawlance, IBM,
33kv substation lay out details & line to line & line to earth measurements
What are the classifications of oscillators?
How to implement 6 output with 3 input NAND gate?
how can i increase the excitation on full load running engine??
what is polarity in ac system? and how do identified?