Mechanical Drawing · SHS2 Design And…

Lesson notes

Learning Objectives

Indicator: 2.3.2.LI.2 - Use electronic and electrical symbols to draw simple electronic and electrical circuit diagrams.

By the end of the lesson, learners can:

Identify at least eight standard electrical and electronic symbols (cell, battery, lamp, switch, fuse, circuit breaker, diode, resistor) when shown on a chart or model.
Distinguish between electrical circuit diagrams and electronic circuit diagrams, giving at least one example of each.
Draw a neat electrical circuit diagram containing a cell, a switch, a fuse and a lamp, using correct symbols and proper line work.
Draw a neat electronic circuit diagram containing a cell, a resistor, a diode and a lamp, using correct symbols and proper line work.
Explain their finished circuit diagram in their own words, describing the function of each component and the direction of current flow.

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Curriculum details

Strand: Extended Drawing (Strand 3)
Sub-strand: Mechanical Drawing (3.2)
Content standard: 2.3.2.CS.2 - 2.3.2.CS.2 Understand the principles of Electrical drawings (Understand the application of the principles of Electrical drawings). 2.3.2.LO.1 Make accurate sectional drawings of machine parts or components, adhering to the principles of sectioning in engineering. 2.3.2.LO.2 Use your understanding on the principles of electrical circuit and circuit diagrams to explain electrical circuit and circuit diagrams,
Indicator: 2.3.2.LI.2 - Use electronic and electrical symbols to draw simple electronic and electrical circuit diagrams.
Suggested placement: Semester 2, Week 15 (Week 35 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. 75

Exemplars (from the NaCCA curriculum)

Activity based learning, Experiential learning: Guide learners to use a switch, fuse and circuit breakers to design a simple electrical circuit. Again, assist the learners to use a cell, a lamp and a diode to design an electronic circuit

Activity based learning: With the use of drawing instrument, learners make neat circuit diagrams from the electrical and electronic circuits designed

Collaborative learning/ Group work, Project-based learning: Through brainstorming, charts, pictures and in mixed gender grouping, assist learners to design an electrical or electronic circuit using five different components and use a drawing instrument to develop it into a circuit diagram. Use the circuit diagram to explain schematic diagram"

Assessment (2.3.2.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.

Teaching and Learning Materials:
- Models
- Charts
- Reference books
- Drawing studio
- Drawing instruments
- Access to internet
- LCD Projector