MOSFET vs BJT transistor is an important comparison in basic electronics, semiconductor devices, computer hardware and electronic circuit design. Both MOSFETs and bipolar junction transistors are used for switching and amplification, but they differ in their construction, method of control, input impedance, current requirements, switching characteristics and applications.
The main difference is that a MOSFET is a field-effect transistor whose channel conductivity is controlled by an electric field produced by the gate-to-source voltage. A BJT is a bipolar junction transistor in which the relationship between base current and collector current is important during normal forward-active operation.
This article explains MOSFET vs BJT differences in a simple, exam-oriented format. It includes a parameter-wise comparison table, working principles, formulas, advantages, disadvantages, applications, examples and frequently asked questions. It is useful for students preparing for computer hardware, electronics, diploma and introductory engineering examinations.
Quick answer: MOSFETs are widely used in power switching, digital circuits and motor controllers, whereas BJTs are commonly used in amplification, signal processing and switching circuits. The best device depends on the circuit requirements rather than on one device being universally superior.
