When the emitter is make forward bias with respect to base the holes from the emitter close towards the base. The emitter is of p-type material which is heavily dope. In a p-n-p transistor the emitter base junction is forward bias and collector base junction is reverse bias. In general the current equation is I E = I B + I C. So in this way all most the entire emitter current flows in the collector circuit.
Npn transistor symbol free#
The remaining free electrons (more than 95 % ) cross over into the collector region to constitute collector current ( I C ). Therefore only a few electrons ( less than 5 % ) combine with holes to constitute base current ( I B ). The forward bias cause the free electrons very thin. In a n-p-n transistor the emitter base junction is forward bias and collector, base junction is reverse bias. So that it can remove charge carriers from its junction with the base.įor What is rectifier in electronics? click here. It is moderately doped and it has larger area. The collector section collects the charge carriers there are emitted by the emitter. So it is lightly doped and it has narrow area. The middle section which forms to p-n junction between emitter and collector is know as base. It is heavily doped and its area less than the area of collector. The emitter is always forward bias with respect to base. The emitter emits or supplies charge carriers for p-type supply hole charge carriers and in n-type its supply free electrons. Now we will learn about the three terminals So let’s start Emitter Read also this types of electron emission Therefore, a transistor transfers a signal from low resistance region to high resistance region. The weak signal is introduce in the low resistance circuit and output is take from the high resistance circuit. The forward bias junction has low resistance path whereas a reverse bias junction has high resistance path.
p-n-p transistor is formed by two p-type semiconductor separate by a thin section of n-type.Īmount of two junction one junction is forward bias and other is reverse bias. N-p-n transistor is compose of two n-type semiconductors separate by a thin section of p-type. The BJT is of two types one is (1) n-p-n transistor and another is (2) p-n-p transistor. There are two types of transistors (1) BJT (Bipolar junction transistor) and (2) FET ( Field effect transistor ). The three terminals are Emitter, Base, and Collector. What is transistor in electronics ? Transistor is an electronic device which transfer the signal from low resistance region to high resistance region.įor what is the filter circuit? click hereĪ transistor is a semiconductor device which has two junction, three layer and three terminals.
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