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The device which acts like an NPN and a PNP transistor connected base to base and emitter to collector is?
Wiki User
∙ 13y ago
Triac
Wiki User
∙ 13y ago
Anonymous
bascb
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Why transistor have 4 wire?
The transistor is a three layer (or two junction) device, emitter, base, and collector (or other designations for variations such as FET's). Each layer is connected to a terminal. Three layers - three terminals.
What is a trausister?
Do you mean transistor? A transistor is a small low-powered solid-state electronic device, consisting of a semi conductor and at least three electrodes: emitter, base and collector. Fiifi Krampah.
Difference between bjt and ujt?
UJT is the voltage controlled device.in which only one mejority carriers are responsible for current flowing. UJT is one junction transistor and it is three terminal emitter and two base. BJT is the current controlled device. in which both mejority and minority carrier are responsiblefor current flowing. this type of transistor consists of two junction and three terminal these are : emitter , base , collector.
How does triac works?
Triac is Three Layered Device . Emitter ,Collector and Gate
What is the purpose of a transistor in a circuit?
A transistor has three leads, called the base, the collector, and the emitter. The voltage of the base (in relation to the ground) determines whether and how much current flows from the collector to the emitter. An NPN transistor can be off, meaning that there is no (or very little) voltage from the base; partly on, meaning that there is some voltage from the base; or saturated, meaning that it is receiving full voltage from the base. A saturated transistor allows the current to flow from the collector to the emitter unopposed; a partly on transistor provides some resistance; and a transistor that is off provides full resistance. A PNP transistor is similar to an NPN transistor except it performs the opposite function: when it is saturated, the current is fully resisted; when there is no voltage from the base, the current is not at all resisted; and when it is partly on there is some resistance. In sum, a transistor controls the flow between the collector and the emitter based upon the voltage of the base. this is carbage. a transistor is basicaly two diodes back to back base being common TO BOTH DIODES because of inpurity doping on purpose at the depletion region the transistor will control the current flow on the other diode. Once it reaches saturation both diodes conduct therefore current can flow in BOTH DIRECTIONS ACROSS IT.
Why transistor have 4 wire?
The transistor is a three layer (or two junction) device, emitter, base, and collector (or other designations for variations such as FET's). Each layer is connected to a terminal. Three layers - three terminals.
Why collector is made larger than base and emitter in a transistor?
Collector has larger area than base and emitter because base collector is reverse biased, hence the current flow here due to the minority carriers and the large power dissipation takes place by the majority carriers, this power dissipated in the form of heat.. To cool the device from heat we made the larger area........
Why the transistor is not used in switching 'AC voltage'?
The transistor is a "single direction current flow" device. Typically, for an NPN device, the collector must be more positive than the emitter for the device to bias on. You could use the transistor in an AC circult, but it would only conduct on half the cycle.
What is a trausister?
Do you mean transistor? A transistor is a small low-powered solid-state electronic device, consisting of a semi conductor and at least three electrodes: emitter, base and collector. Fiifi Krampah.
Relation between current gain and collector current?
That's referred to as, `hfe` in transistor parlance. Essentially, since a transistor is a current operated device, the gain means that for every milliamp in at the base, the gain (times X) will be amplified through the junction of the collector/emitter. For instance, take a transistor with a gain of 30. One milliamp in at the base will allow the transistor to pass 30 milliamps through the collector/emitter junction. Of course, there will also be a resultant voltage drop of 1.2 volts over all. -.6 volts for the base and -.6 volts through the collector/emitter junction. Remember, you're working with a current controlled device, and not a voltage controlled device like an op-amp.
Did someone ask the question can you use a transistor as a diode there is a device called a transistor diode connect base to either c or e forgot which to make a zero bias diode?
You can use a transistor as a diode if you connect the base to the collector. Any forward current through the base-emitter junction would cause a corresponding increase in the available current through the collector-emitter junction. Since the base-emitter and collector-emitter junctions are in parallel, this would effectively be a diode, but a true diode would be a better solution if diode functionality is what seek. A: There are actually two diodes, per se, inside a transistor. The base to emitter diode will suffice. By tying the collector to the base it will in effect be two diodes in parallel.
Why transistor is named so?
What?In May 28, 1946, a survey conducted by Bell Labs offered “a discussion of some proposed names”Among them was "transconductance/transfer varistor".So the question repeats the common mistake that it was "transfer resistor".
What is base modulator?
As the applied base-collector voltage (VBC) varies, the base-collector depletion region varies in size. This variation causes the gain of the device to change, since the gain is related to the width of the effective base region. This effect is often called the "Early Effect"An NPN bipolar transistor can be considered as two diodes connected anode to anode. In normal operation, the emitter-base junction is forward biased and the base-collector junction is reverse biased. In an npn-type transistor for example, electrons from the emitter wander (or "diffuse") into the base
What is base-width modulation?
As the applied base-collector voltage (VBC) varies, the base-collector depletion region varies in size. This variation causes the gain of the device to change, since the gain is related to the width of the effective base region. This effect is often called the "Early Effect"An NPN bipolar transistor can be considered as two diodes connected anode to anode. In normal operation, the emitter-base junction is forward biased and the base-collector junction is reverse biased. In an npn-type transistor for example, electrons from the emitter wander (or "diffuse") into the base
What is base width modulation?
As the applied base-collector voltage (VBC) varies, the base-collector depletion region varies in size. This variation causes the gain of the device to change, since the gain is related to the width of the effective base region. This effect is often called the "Early Effect"An NPN bipolar transistor can be considered as two diodes connected anode to anode. In normal operation, the emitter-base junction is forward biased and the base-collector junction is reverse biased. In an npn-type transistor for example, electrons from the emitter wander (or "diffuse") into the base
Difference between bjt and ujt?
UJT is the voltage controlled device.in which only one mejority carriers are responsible for current flowing. UJT is one junction transistor and it is three terminal emitter and two base. BJT is the current controlled device. in which both mejority and minority carrier are responsiblefor current flowing. this type of transistor consists of two junction and three terminal these are : emitter , base , collector.
Why ujt have this type of symbols?
The symbols in the unijunction transistor show its internal configuration. The emitter (arrow) represents the polarity. When it points in that is a P type transistor. Pointing out is an N type. The the table on its side the table top touching the emitter (arrow). Its' "legs" are the connection to two bases in the device. It does not have a collector. Refer to another Wiki answer for more info.
