Applications of Electronics · SHS3 Physics

Lesson notes

Learning Objectives

Indicator: 3.3.4.LI.3 - Design a smoother/filter circuit using capacitor.

By the end of the lesson, learners can:

Explain the purpose of a smoother/filter circuit in converting a pulsating DC output from a rectifier into a steady DC output.
Identify the correct placement of a capacitor in parallel with the load resistor in a rectifier circuit.
Describe how a capacitor charges and discharges during the rectification cycle to reduce ripple.
Design a capacitor filter circuit for both half-wave and full-wave rectifiers, labelling all components correctly.
Evaluate the effect of changing capacitance value on the smoothness of the output waveform, using reasoning and simple calculations.

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Curriculum details

Strand: Electric Field, Magnetic Field and Electronics (Strand 3)
Sub-strand: Applications of Electronics (3.4)
Content standard: 3.3.4.CS.1 - Demonstrate knowledge and understanding of rectification. 3.3.4.LO.1 Using diode, capacitor and a load resistor explain how an ac waveform can be rectified to direct waveform.
Indicator: 3.3.4.LI.3 - Design a smoother/filter circuit using capacitor.
Suggested placement: Semester 2, Week 13 (Week 33 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 193

Exemplars (from the NaCCA curriculum)

Collaborative learning: Using simulations and multimedia, let learners watch a video/simulation of how a smoother/filter circuit is designed.
Encourage the appreciation and valuing of the skills and abilities of individuals from diverse backgrounds, including gender, race, ethnicity, socioeconomic status, and disabilities.
Assessment (3.3.4.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.
Teaching and Learning Resources:
- Audio-visuals
- Internet
- Projectors
- YouTube
- Reference books
- Flash cards
- Field trips or visits