Explain the working of an npn transistor, Electrical Engineering

Assignment Help:

Explain the working of an npn transistor.

Working of npn transistor: In an npn transistor is demonstrated in the figure. The emitter base junction is forward biased whereas the collector base junction is in reversed biased. The forward biased voltage VEB is fairly small, while the reverse biased voltage VCB is considerably large.

Since the emitter base junction is forward biased, several of electrons (majority carrier) in the emitter (in n-type region) are pushed in the direction of the base. It constitutes the emitter current IE. Whereas these electrons enter the p-type material (base), they tend to merge with holes. Since the base is lightly doped and extremely thin, only some electrons (less than 5 percent) combine along with the holes to constitute base current IB. The remaining electrons (more than 95 percent) diffuse across the thin base region and reach collector space charge layer. Such electrons then come under the affect of positively biased n- region and are collected or attracted by the collector. It constitutes the collector current IC. Therefore, it is seen that almost the whole emitter current flows in the collector circuit. The emitter current is the sum of the collector, and base current. IE =IC + IB.

1544_npn Transistor Circuit.png

npn Transistor Circuit


Related Discussions:- Explain the working of an npn transistor

Explain multimedia extensions technology, Explain MMX Technology. Mult...

Explain MMX Technology. Multimedia extensions technology adds 57 newly instructions to the instruction set of the Pentium - 4 microprocessors. The Multimedia extensions techno

Dsp, A pure sine wave with a frequency of 100Hz is sampled at 150Hz. At whi...

A pure sine wave with a frequency of 100Hz is sampled at 150Hz. At which one of the following frequencies would you expect an alias?

Three phase induction motors - motor control , Three Phase Induction Motors...

Three Phase Induction Motors A three  phase induction rotor  consists  a stators  and a motor stator has balanced three  phase  winding. These windings  are distributed in the

What is the maximum speedup, Question: (a) Explain the following metric...

Question: (a) Explain the following metrics: (i) Throughput (ii) Latency (iii) IPC (b) Of the three factors in the equation (EXCPU = Number of instructions × CPI × cy

Cro, what is cro ?

what is cro ?

Inductive coupling, #question. i want design of inductive coupling to trans...

#question. i want design of inductive coupling to transfer power @ 2 watt in air gap of 5mm radial distance..

Frequency response of a r-c coupled amplifier, Q. Write a short note on the...

Q. Write a short note on the frequency response of a R-C coupled amplifier. At low frequencies ( , the reactance of coupling capacitor Cc is quite high and hence very small pa

Objective of long-term plans for technical loss reduction, Objective of Lon...

Objective of Long-Term Plans for Technical Loss Reduction The primary objectives of strengthening and improvement of sub-transmission and distribution system in the long-term

Branch operations , Branch Operations Normally  the program  executes ...

Branch Operations Normally  the program  executes in  a sequence. The contents of the program counter register are incremented by  one during  the execution  of current  instr

Determine the power rating of compressor motor, An ice plant produces 12ton...

An ice plant produces 12tonn of ice per day at 0 0 C using water at 300C. The plant operates on reversed Carnot cycle between -15 0 C and 28 0 C. If the actual C.O.P. is 50% of the

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd