![]() ![]() Whereas the base is very small in comparison to both collector and emitter. We must note that the size or the length of the collector is large in comparison to the emitter to dissipate the heat. Hence the correct option is B where the length of collector is greater than that of emitter The base of a transistor is lightly doped and also very thin due to which it offers the majority charge carrier to the base. The base forms two circuits, they are the input circuit with the emitter and the output circuit with the collector. The collector section of the transistor is moderately doped, but larger in size hence it can collect most of the charge carrier supplied by the emitter.īase – It is the middle section of the transistor. The collector-base junction is always reverse biased. The emitter of a transistor is highly doped and moderate in size.Ĭollector – In a transistor, collector is the section that collects the majority of the charge carrier supplied by the emitter. The functions of each of these terminals are described below:Įmitter –The emitter is always forward biased with respect to the base so that it supplies the majority charge carrier to the base. A transistor has three zones emitter, base and collector, and can be built two different ways, as NPN or PNP. Now put the meter in diode mode and check the other two pins, if the positive lead is placed on the base and the negative on emitter then you meter will read a voltage drop of 0.5 to 0.7 for a NPN transistor. ![]() Looking at the circuit it can be seen that although the emitter voltage follows that of the base. Simply put your multi-meter in continuity mode and check which pin is in connecting with the metal casing. Transistors have three terminals which are named as emitter, collector and base. Transistor common collector circuit configuration. Transistors are considered special because they allow us to control how much current flows through a circuit which can be achieved by controlling the voltage across two of the transistors leads. In simple words we can regulate and amplify electrical signals such as voltage or current. A transistor is a semiconductor device which can transfer a weak signal from a low resistance circuit to a high resistance circuit. If the base-emitter junction is forward biased, the transistor is on. The base-emitter junction behaves like any other PN junction when viewed alone. For a transistor to function, the two PN junctions must be properly biased. Hint : To answer this question we must know what a transistor is. Transistor Biasing (cont) Were continuing on in Chapter 10 with the subject of biasing. ![]()
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