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Assignment sample solution of ELEC3021 - Power Electronics

Q.1 What are the key differences between MOSFETs and BJTs, and how do their applications vary?

Q.2 Explain the role of capacitors in electronic circuits, with examples.

Q.3 How does an inductor function in an electronic circuit, and where is it commonly used?

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Electronics Assignment Sample

Q1:

Answer :

MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) are voltage-controlled devices, while BJTs (Bipolar Junction Transistors) are current-controlled. MOSFETs offer high input impedance and faster switching, making them ideal for power electronics and digital circuits.

BJTs, with higher current gain, are suited for analog applications like audio amplifiers. The choice depends on factors like power requirements, switching speed, and signal amplification.

Q1:

Answer :

Capacitors store and release electrical energy, influencing voltage and current in circuits. They are used for filtering, coupling, decoupling, and energy storage. For example, in power supplies, capacitors smooth out voltage fluctuations, while in audio circuits, they couple AC signals between stages. Their ability to block DC and pass AC makes them essential in numerous applications.

Q1:

Answer :

Inductors oppose changes in current by generating a magnetic field. This property makes them useful for energy storage, filtering, and tuning circuits.

In power supplies, they filter out AC ripples, while in RF circuits, they tune frequencies. Their application in transformers and chokes highlights their role in managing electromagnetic fields.