SHS1 Applied Technology · Semester 2 Week 3: Electronic Devices and Circuits

Lesson notes

Learning Objectives

Indicator: 1.3.2.LI.3 - Apply the principles of Diodes in designing circuits

By the end of the lesson, learners can:

Test diodes (power diode, Zener diode, LED, photo diode, infrared diode) using a multimeter and classify each as good or faulty, stating the reason for their conclusion.
Draw and label the circuit diagram for both half-wave and full-wave rectification circuits using diodes.
Construct and simulate a half-wave rectifier and a full-wave rectifier using Multisim software, including a Zener diode for voltage stabilisation and an LED as an output indicator.
Explain the process of rectification by tracing the flow of current through the circuit during both halves of the AC input cycle.
Design and build a simple security circuit using a photo diode and an infrared diode, and demonstrate how it detects the interruption of light.

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Curriculum details

Strand: Electrical and Electronic Technology (Strand 3)
Sub-strand: Electronic Devices and Circuits (3.2)
Content standard: 1.3.2.CS.1 - 1.3.2.CS.1 Demonstrate understanding of Diodes as electronic devices and apply them in designing electronic circuits. 1.3.2.LO.1 Employ knowledge of the construction and operation of diodes to design and construct electronic circuits.
Indicator: 1.3.2.LI.3 - Apply the principles of Diodes in designing circuits
Suggested placement: Semester 2, Week 3 (Week 23 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. 48

Exemplars (from the NaCCA curriculum)

Problem-Based Learning/ collaborative learning/experiential learning/ Project-based
learning: Engage learners in mixed ability groupings to :
- Test for good diodes and faulty ones and exhibit honesty in the in identifying good diodes from faulty ones.
- Design and simulate using multism software, rectification circuit (half wave and full wave) using diodes, exhibiting sense of responsibility in the care of tools and equipment given them.
- Using mixed ability grouping, task learners to go through the process of rectification.
Note: Zener diode should be used to stabilise the output dc and LED to be used as an indicator.
- Engage learners in mixed ability grouping to build a security circuit using photo diode and infrared diode as a project work. NB: The grouping based on mixed ability and mixed gender should be encouraged and those with less interest in practical activities as well as the use of computers in designing, especially the ladies, should be made leaders in the various groups.

Assessment (1.3.2.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning; Level 4 Extended critical thinking and reasoning.

Teaching and Learning Materials:
- power diode
- Zener diode
- LED
- infrared diode
- photo diode
- signal generator
- Oscilloscope
- Capacitors
- computer installed with multism application