Ham Amateur Radio Technician Practice Exam

Which of the following components are used in a power supply filter network?

1. Resistors and transformers

2. Capacitors and inductors

3. Diodes and fuses

4. Transistors and relays

The correct answer is: Capacitors and inductors

The use of capacitors and inductors in a power supply filter network is pivotal for ensuring a stable and clean power supply. In power supplies, particularly ones that convert alternating current (AC) to direct current (DC), these components play significant roles. Capacitors are used to smooth out fluctuations in the voltage by storing and releasing energy, which helps reduce the ripple voltage that is typically present after rectification. This means they help create a more stable DC output by filtering out AC components. Inductors, on the other hand, can be employed to oppose changes in current, contributing to minimizing the noise and ensuring a more stable flow of electricity. They work in conjunction with capacitors to form filters that can mitigate unwanted frequencies and improve the overall quality of the power being supplied. The combination of these two types of components allows for effective filtering, making them essential in the design of power supply circuits. Thus, their application in power supply filter networks is foundational in electronics, particularly in applications involving ham radios and many other devices where clean power is crucial.