This insulation roots low power consumption & it is a benefit in this transistor. The gate terminal is made of metal and detached from source & drain terminals using a metal oxide. The source and Drain terminals are made of N-type semiconductor for N-channel MOSFETs and equally for P-channel devices. These transistors are available in 4 different types such as P-channel or N-channel with either an enhancement mode or depletion mode. Here, the drain current is controlled by the voltage of the gate terminal Therefore, these transistors are voltage-controlled devices. The MOSFET is one kind of FET (Field Effect Transistor), which consists of three terminals namely gate, source, and drain. Please follow the below link to know more about the Major Difference between BJT and FET. So this transistor is a current controlled device. By this, it is shown that the input current controls the flow of o/p current. The change in voltage affects the current entering in a Base terminal and this current will, in turn, affect the o/p current called. For instance, the configuration of a common emitter is shown in the figure below. The working principle of a BJT involved the use of Voltage between the two terminals such as base and emitter to regulate the flow of current through the collector terminal. BJTs are apt for low current applications like switching purposes. The operating principles of these transistors are practically equal and the main difference is in biasing as well as the polarity of the power supply for each type. In the PNP transistor, P stands for positive and the majority charge carriers are holes whereas in the NPN transistor, N stands for negative and the majority charge carriers are electrons. The main difference between BJT and MOSFET is their charge carriers. There are two kinds of transistors namely PNP and NPN. The two regions are named the P-junction and N-junction. Actually, a BJT is a silicon piece that includes three regions and two junctions. This transistor consists of three terminals namely the emitter, base, and collector.
Fundamentally, the operation of a BJT transistor is determined by the current at the base terminal. The BJT is a current-controlled device where the o/p of the base terminal or emitter terminal is a function of the current in the base terminal. A bipolar junction transistor is one type of semiconductor device and in the olden days, these devices are used in the place of vacuum tubes.
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