Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: Second Term
Week: 5
Age: 15 years
Duration: 45 minutes
Subject: GSM Maintenance And Repairs
Curriculum Theme: Trade
Previous Lesson: Simple Electric Circuits: Uses Of Resistors, Capacitors, Inductors And Colour Coding.
Topic: Common Electronic Devices
Subject Matter: Definition of diode, Definition of transistor, Definition of integrated circuits, Uses of diodes, Uses of transistors, Uses of ICs

Specific Objectives

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

Cognitive Domain:

Define a diode, a transistor, and an integrated circuit (IC).
State at least two uses of a diode.
State at least two uses of a transistor.
State at least two uses of an integrated circuit (IC).

Affective Domain:

Appreciate the importance of diodes, transistors, and ICs in electronic devices.
Show interest in identifying different electronic components.

Psychomotor Domain:

Identify physical examples of diodes, transistors, and ICs.
Observe the basic structure of these components.

Collaborate with peers to discuss the functions of electronic components.
Share ideas about common devices where these components are found.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for GSM Maintenance and Repairs.
State Unified Scheme of Work for Senior Secondary Schools.
Basic Electronics for Senior Secondary Schools by a relevant author.

Instructional Materials

The teacher will teach this lesson with the aid of:

Actual samples of a diode, transistor, and an IC chip.
A breadboard for demonstration.
Charts showing symbols and common applications of these components.

Rationale for the Lesson

Understanding common electronic devices like diodes, transistors, and integrated circuits is important because they are fundamental building blocks of almost all modern electronic gadgets. This lesson helps pupils to identify these core components and understand their basic functions, which is essential for effective GSM maintenance and repairs.

Prerequisite/Previous Knowledge

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

Lesson Content/Board Summary

Common Electronic Devices

Definition of Diode

A diode is a two-terminal electronic component that conducts current primarily in one direction. It has a low resistance to current flow in one direction and a high resistance in the reverse direction.

Uses of Diodes

The following are some common uses of diodes:

Rectification: Converting alternating current (AC) to direct current (DC).
Voltage Regulation: Used in Zener diodes to maintain a stable output voltage.
Signal Demodulation: Extracting information from modulated radio signals.
Clipping and Clamping: Modifying signal waveforms.

Definition of Transistor

A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is one of the fundamental building blocks of modern electronic devices.

Uses of Transistors

The following are some common uses of transistors:

Amplification: Increasing the strength of weak electronic signals (e.g., in radios, audio amplifiers).
Switching: Acting as electronic switches to turn current on or off (e.g., in digital circuits, computers).
Oscillation: Generating repetitive electronic signals.
Modulation: Varying the characteristics of a carrier wave.

Definition of Integrated Circuits (ICs)

An Integrated Circuit (IC), also known as a microchip or chip, is a miniaturized electronic circuit consisting of many semiconductor devices (like transistors, diodes, resistors, and capacitors) fabricated on a single silicon substrate.

Uses of Integrated Circuits (ICs)

The following are some common uses of Integrated Circuits:

Microprocessors: The central processing units in computers and smartphones.
Memory Chips: Storing data in various electronic devices (RAM, ROM).
Amplifiers: Audio and video signal amplification.
Timers: Generating precise time delays or oscillations.
Logic Gates: Performing logical operations in digital systems.

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 on basic electronic components, and introduces the topic “Common Electronic Devices” by asking pupils to name some electronic gadgets they use daily.
Pupils’ Activity: Pupils respond to greetings, recall the previous lesson, and name electronic gadgets.
Learning Point: Pupils are prepared for the new lesson and connect it to their daily experiences.

Step 2: Definition of Diode

Time: 7 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher defines a diode, explains its one-way current flow characteristic, and shows a physical example of a diode. The teacher also draws its symbol on the board.
Pupils’ Activity: Pupils listen attentively, observe the diode, and copy notes and the symbol from the board.
Learning Point: Pupils understand what a diode is and can identify its physical appearance and symbol.

Step 3: Uses of Diodes

Time: 5 minutes
Teaching Skill: Explanation/Elaboration
Teacher’s Activity: The teacher explains the primary uses of diodes, focusing on rectification (AC to DC conversion) with simple examples relevant to GSM devices (e.g., phone chargers).
Pupils’ Activity: Pupils listen and ask questions for clarification.
Learning Point: Pupils understand the practical applications of diodes.

Step 4: Definition of Transistor

Time: 7 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher defines a transistor as a device for amplification and switching, shows a physical example, and briefly explains its three terminals (base, collector, emitter). The teacher also draws its symbol.
Pupils’ Activity: Pupils observe the transistor, listen to the explanation, and copy notes and the symbol.
Learning Point: Pupils understand what a transistor is and can identify its physical appearance and symbol.

Step 5: Uses of Transistors

Time: 5 minutes
Teaching Skill: Explanation/Application
Teacher’s Activity: The teacher explains the key uses of transistors, emphasizing their roles as amplifiers and electronic switches, giving examples like in mobile phones for signal processing.
Pupils’ Activity: Pupils listen, take notes, and relate the uses to known electronic devices.
Learning Point: Pupils understand the practical functions of transistors.

Step 6: Definition and Uses of Integrated Circuits (ICs)

Time: 8 minutes
Teaching Skill: Explanation/Visualisation
Teacher’s Activity: The teacher defines an Integrated Circuit (IC) as a complete circuit on a single chip, highlighting its miniaturization. The teacher shows an IC chip and explains its various uses, such as in microprocessors and memory chips in phones.
Pupils’ Activity: Pupils observe the IC chip, listen to the explanation, and understand its significance.
Learning Point: Pupils understand what an IC is and its wide range of applications in modern electronics.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

Define a diode.
Mention two uses of a diode.
What is a transistor?
State two ways transistors are used in electronic circuits.
Define an Integrated Circuit (IC).
List two common uses of Integrated Circuits.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 3 minutes
Teaching Skill: Summarization/Assignment
Teacher’s Activity: The teacher summarizes the main points of the lesson, emphasizing the importance of diodes, transistors, and ICs as building blocks of electronics. The teacher then assigns homework: “Draw the symbols for a diode and a transistor, and research one more use for each.”
Pupils’ Activity: Pupils listen to the summary and copy the homework.
Learning Point: Pupils consolidate their learning and are given tasks to reinforce their understanding.

Lesson Keywords

Diode – An electronic component that allows current to flow in one direction only.
Transistor – A semiconductor device used for amplification or switching electronic signals.
Integrated Circuit (IC) – A miniaturized electronic circuit fabricated on a single semiconductor material.
Rectification – The process of converting alternating current (AC) to direct current (DC).
Amplification – The process of increasing the strength of an electronic signal.
Switching – The act of turning an electronic signal or current on or off.

Differentiation

For pupils who are struggling, the teacher will provide simplified diagrams and focus on one or two key uses for each component. For advanced pupils, the teacher will encourage them to research different types of diodes (e.g., Zener, LED) and transistors (e.g., NPN, PNP) and their specific applications.

Note for teachers using this lesson plan

Ensure that actual components are available for pupils to see and handle if possible, as this greatly enhances understanding. Emphasize the practical relevance of these components in everyday electronic devices, especially mobile phones. Safety precautions should be observed when handling any electronic components or tools.