SHS3 Physics · Semester 2 Week 12: Applications of Electronics

Lesson notes

Learning Objectives

Indicator: 3.3.4.LI.1 - Design half wave rectifier.

By the end of the lesson, learners can:

Explain, with the aid of a block diagram, how a half wave rectifier converts an alternating current (AC) input into a pulsating direct current (DC) output.
Identify the components of a half wave rectifier (diode, load resistor) and state the function of each component in the circuit.
Draw the circuit diagram of a half wave rectifier, correctly placing the diode and load resistor in series with the AC source.
Sketch and compare the input and output waveforms of a half wave rectifier, identifying the positive half cycles that pass through and the negative half cycles that are blocked.
Calculate the ripple frequency of a half wave rectifier output for a given mains frequency and justify why the output is still not a steady DC (linking to the need for a filter, which is the focus of a later lesson).

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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.1 - Design half wave rectifier.
Suggested placement: Semester 2, Week 12 (Week 32 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 half wave rectifier is built.
Engage with inclusive resources and role models in physics.
Assessment (3.3.4.AS.1). 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