8/27/2023 0 Comments Transistor active region![]() The collector terminal connected to the voltage VCC through the load RL. In the above circuit connections we observed that the supply voltage VB is applied to the base terminal through the load RB. The working of NPN transistor is quite complex. Here the collector terminal always connected to the positive voltage, the emitter terminal connected to the negative supply and the base terminal controls the ON/OFF states of transistor depending on the voltage applied to it. The above figure shows the NPN transistor circuit with supply voltages and resistive loads. Now let us see the operation of the NPN transistor with explanation. In this structure we can observe the three terminals of transistor, circuit currents and voltage value representations. The above figure shows the symbol and structure of NPN transistor. The NPN transistor is mostly used for amplifying and switching the signals. The NPN transistor has three terminals – emitter, base and collector. Generally the NPN transistor is the most used type of bipolar transistors because the mobility of electrons is higher than the mobility of holes. ![]() The flowing of these electrons from emitter to collector forms the current flow in the transistor. Here the majority charge carriers are the electrons. ![]() The NPN transistor consists of two n-type semiconductor materials and they are separated by a thin layer of p-type semiconductor. NPN transistor is one of the Bipolar Junction Transistor (BJT) types.
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