Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: 2nd Term
Week: 7
Age: 15 years
Duration: 45 minutes
Subject: Gsm Maintenance And Repairs
Curriculum Theme: Trade
Previous Lesson: Common Electronic Devices: Digital And Analogue IC Differences And Pin Layout.
Topic: Electronics signs and symbols
Subject Matter: Types of electronic diagrams, Types of electronic signs, Types of electronic symbols

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define electronic symbols.
State at least three types of electronic diagrams.
Identify five common electronic signs and symbols.

Affective Domain:

Appreciate the importance of electronic symbols in understanding circuit diagrams.
Understand the role of symbols in simplifying the representation of electronic components.

Psychomotor Domain:

Draw accurately at least three common electronic symbols.
Differentiate between various electronic symbols when presented with a circuit diagram.

Participate actively in class discussions regarding electronic symbols.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Senior Secondary Schools.
State Unified Scheme of Work for Senior Secondary Schools.
GSM Maintenance and Repairs for Senior Secondary Schools, by [Author’s Name/Textbook Title].

Instructional Materials

The teacher will teach this lesson with the aid of:

Symbol chart showing various electronic symbols.
Drawing paper and pencils.
Projector (if available) for displaying diagrams.
Whiteboard/chalkboard and markers/chalk.
Sample circuit diagrams.

Rationale for the Lesson

Understanding electronic signs and symbols helps pupils read and interpret circuit diagrams, which is important for diagnosing and repairing electronic devices, including mobile phones. This knowledge forms a basic foundation for further studies and careers in electronics and related fields.

Prerequisite/Previous Knowledge

Pupils have a basic understanding of electricity and simple electronic components.

Lesson Content/Board Summary

Electronics Signs and Symbols

Introduction to Electronic Symbols

Electronic symbols are graphical representations used to denote various electrical and electronic components in a circuit diagram. They simplify the design and understanding of complex circuits.

Types of Electronic Diagrams

Electronic diagrams are visual representations of electronic circuits, illustrating how components are connected and function. The following are common types of electronic diagrams:

Schematic Diagram: This diagram shows the functional connections between components using standard electronic symbols. It focuses on how the circuit works logically.
Block Diagram: This diagram uses blocks to represent major functional units of a system, showing the overall flow of signals or data without detailing individual components.
Wiring Diagram (or Layout Diagram): This diagram shows the physical layout and actual wiring connections of components, often indicating their positions on a board or chassis.

Common Electronic Signs and Symbols

The following are some common electronic signs and symbols and their basic functions:

Resistor: Limits or opposes the flow of electric current.
Capacitor: Stores electrical energy in an electric field.
Inductor (Coil): Stores energy in a magnetic field.
Diode: Allows current to flow in one direction only.
Light Emitting Diode (LED): A diode that emits light when current flows through it.
Transistor (NPN/PNP): Acts as an electronic switch or amplifier.
Battery: Provides a direct current (DC) power source.
Ground: A common return path for electric current, often connected to the earth.
Switch: Opens or closes a circuit to control current flow.
Fuse: A safety device that melts and breaks the circuit when current exceeds a safe level.
Speaker: Converts electrical signals into sound waves.
Microphone: Converts sound waves into electrical signals.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils, reviews the previous lesson briefly, and then introduces the new topic, “Electronics Signs and Symbols,” by asking pupils if they have ever seen a circuit diagram and what they think the different drawings represent.
Pupils’ Activity: Pupils respond to the teacher’s questions and state what they know about circuit diagrams.
Learning Point: Pupils are engaged and prepared for the lesson.

Step 2: Explanation of Electronic Symbols

Time: 7 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines electronic symbols and explains their importance in simplifying complex circuit designs and facilitating communication among engineers and technicians. The teacher uses the symbol chart to show examples.
Pupils’ Activity: Pupils listen attentively, take notes, and ask questions for clarification.
Learning Point: Pupils understand the definition and importance of electronic symbols.

Step 3: Types of Electronic Diagrams

Time: 8 minutes
Teaching Skill: Demonstration/Illustration
Teacher’s Activity: The teacher explains and illustrates the different types of electronic diagrams (Schematic, Block, Wiring) using examples from the symbol chart or projected images. The teacher highlights the purpose of each type.
Pupils’ Activity: Pupils observe the diagrams, listen to explanations, and identify the differences between the types.
Learning Point: Pupils can differentiate between various types of electronic diagrams.

Step 4: Common Electronic Signs and Symbols

Time: 10 minutes
Teaching Skill: Visual Aid/Identification
Teacher’s Activity: The teacher displays a chart of common electronic symbols. For each symbol, the teacher draws it on the board, states its name, and briefly explains its function (e.g., resistor, capacitor, diode, battery, ground, switch).
Pupils’ Activity: Pupils identify the symbols, listen to their names and functions, and copy them into their notebooks.
Learning Point: Pupils identify and understand the basic function of common electronic symbols.

Step 5: Practical Identification

Time: 5 minutes
Teaching Skill: Application/Observation
Teacher’s Activity: The teacher distributes simple circuit diagrams or shows them on the projector and asks pupils to identify specific components by their symbols.
Pupils’ Activity: Pupils identify the symbols on the provided diagrams.
Learning Point: Pupils apply their knowledge to identify symbols in practical contexts.

Step 6: Drawing Practice

Time: 5 minutes
Teaching Skill: Practical Application
Teacher’s Activity: The teacher instructs pupils to draw specific electronic symbols previously taught (e.g., resistor, diode, battery) on their drawing paper. The teacher moves around to provide guidance and correction.
Pupils’ Activity: Pupils practice drawing the electronic symbols.
Learning Point: Pupils develop psychomotor skills in drawing electronic symbols.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

What are electronic symbols?
State three types of electronic diagrams.
Draw the symbol for a resistor and a battery.
Mention two functions of a diode.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, emphasizing the importance of understanding electronic symbols for anyone working with electronic devices. The teacher assigns homework to draw more symbols and identify them in a given circuit diagram.
Pupils’ Activity: Pupils listen to the summary and copy the homework assignment.
Learning Point: Pupils consolidate their learning and are prepared for further study.

Lesson Keywords

Symbol – A graphical representation of an electronic component.
Diagram – A visual representation of an electronic circuit.
Schematic – A type of diagram showing functional connections using symbols.
Resistor – An electronic component that limits current flow.
Capacitor – An electronic component that stores electrical charge.
Diode – An electronic component that allows current to flow in one direction.
Battery – A device that provides electrical power.
Ground – A common reference point in an electrical circuit.

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to identify more complex symbols or interpret a slightly more intricate circuit diagram. For pupils needing additional support, the teacher can provide simplified symbol charts and offer one-on-one guidance during drawing practice, focusing on a smaller set of essential symbols.

Note for teachers using this lesson plan

Encourage pupils to actively participate by drawing symbols on the board. Provide ample opportunities for practical identification and drawing practice. Using real-life examples of circuit diagrams from mobile phones or other electronic gadgets can make the lesson more relatable and engaging.