Active-mode npn transistors in circuits, Electrical Engineering

Assignment Help:

Active-mode NPN transistors in circuits

940_Active-mode NPN transistors in circuits.png

Figure:  Structure and use of NPN transistor. Arrow according to schematic.

The figure opposite is a schematic presentation of an NPN transistor associated to two voltage sources. To construct the transistor conduct appreciable current (on the order of 1 mA) from C to E, VBE have to be above a minimum value sometimes considered to as the cut-in voltage. The cut-in voltage is generally about 600 mV for silicon BJTs at room temperature but can be different depending upon the sort of transistor and its biasing. This applied voltage results in the lower P-N junction to 'turn-on' permitting a flow of electrons from the emitter into the base. In active mode, the electric field lay between base and collector (caused by VCE) will cause the majority of these electrons to cross the upper P-N junction into the collector to make the collector current IC. The remainder of the electrons again combines with holes, the majority carriers in the base, making a current by the base connection to form the base current, IB. As displayed in the figure, the emitter current, IE, is the total transistor current that is the sum of the other terminal currents (that is IE=IB+IC).


Related Discussions:- Active-mode npn transistors in circuits

Compute the efficiency of the motor, Q. A 10-hp, 230-V dc shunt motor takes...

Q. A 10-hp, 230-V dc shunt motor takes a full- load line current of 40 A. The armature and field resistances are 0.25 and 230 , respectively. The total brush-contact drop is 2 V,

Hot line maintenance, how do you define the expertise for this hot line mai...

how do you define the expertise for this hot line maintenance?

Explain ferroelectricity, Explain ferroelectricity. Ferroelectricity: ...

Explain ferroelectricity. Ferroelectricity: - Materials of ferroelectric have a high dielectric constant that is non-linear that is, this depends to a considerable extent on t

Working of equalizer circuit, Q. Working of Equalizer circuit? Equalize...

Q. Working of Equalizer circuit? Equalizer circuit: Equalizers are combination of passive components (capacitors, resistors and so on) that are used to regulate the amplitude a

Explain effect of impurity on conductivity of semiconductor, Explain the ef...

Explain the effect of impurity on the conductivity of a semiconductor. To form a semi-conductor conductive, a small amount of appropriate impurity is added. This is then termed

Speed control of three phase induction motors , Speed  Control of Three  ...

Speed  Control of Three  Phase Induction Motors Three  phase  induction motors are invariably used in the application where in speed in  required to be  constant  or adjustabl

How a transistor in common-base configuration amplify signal, Q. With a cir...

Q. With a circuit diagram explain how a transistor in common-base configuration amplify signals.  The common-base terminology is derived from the fact that the base is common t

Factors contributing to high technical losses, Factors Contributing To High...

Factors Contributing To High Technical Losses Power distribution systems in developing countries have faced a phenomenal and rapid growth within the last two decades. Although

Governer, governer characteristics

governer characteristics

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