Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: First Term
Week: 1
Age: 15 years
Duration: 45 minutes
Subject: Basic Electronics
Curriculum Theme: Basic Electronics
Previous Lesson: .
Topic: ELECTRIC CURRENT: Structure of an Atom
Subject Matter: structure of an atom, basic parts of the atom, simple diagram of atomic structure, link between atomic structure and electric current

Specific Objectives

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

Cognitive Domain:

Define an atom.
Identify the basic parts of an atom.
Describe the simple structure of an atom.
Explain the link between atomic structure and electric current.

Affective Domain:

Appreciate the importance of understanding atomic structure in electronics.
Show interest in the study of electric current.

Psychomotor Domain:

Draw a simple diagram of an atom.

Participate in classroom discussions about atomic structure.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum
State Unified Scheme of Work
Basic Electronics for Senior Secondary Schools by A. O. Oladeji

Instructional Materials

The teacher will teach this lesson with the aid of:

Atom charts
Diagram samples of atomic structure
Drawing materials (pencils, papers)

Rationale for the Lesson

Understanding the structure of an atom is important for pupils because it forms the foundation for comprehending how electric current flows. This knowledge helps pupils grasp fundamental concepts in electronics and how various electrical devices work.

Prerequisite/Previous Knowledge

Pupils are assumed to have basic knowledge of matter and its states from their Junior Secondary School science classes.

Lesson Content/Board Summary

ELECTRIC CURRENT: Structure of an Atom

Definition of an Atom

An atom is the smallest unit of matter that retains an element’s chemical identity. It is the basic building block of all matter.

Basic Parts of an Atom

An atom consists of a central nucleus and electrons orbiting around it. The basic parts of an atom are:

Protons: Positively charged particles found in the nucleus.
Neutrons: Neutral particles (no charge) found in the nucleus.
Electrons: Negatively charged particles that orbit the nucleus in specific energy levels or shells.

Simple Diagram of Atomic Structure

In a simple model of an atom, the protons and neutrons form a dense core called the nucleus at the center. Electrons orbit the nucleus in distinct paths or energy shells, similar to planets orbiting the sun. In a neutral atom, the number of protons is equal to the number of electrons.

Link between Atomic Structure and Electric Current

Electric current is the flow of electric charge. The link between atomic structure and electric current is as follows:

The electrons in the outermost shell of an atom are called valence electrons.
In good conductors (like metals), these valence electrons are loosely bound to the nucleus.
These loosely bound electrons can easily break free from their atoms and move randomly within the material.
When an electric field is applied (e.g., by connecting a battery), these free electrons are forced to move in a specific direction.
This directed movement of free electrons constitutes electric current.

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 and asks them what they understand by “matter” and its basic components. The teacher then introduces the topic “ELECTRIC CURRENT: Structure of an Atom” by explaining that understanding matter at its smallest level is key to understanding electricity.
Pupils’ Activity: Pupils respond to questions about matter and listen attentively to the introduction.
Learning Point: Pupils are prepared for the lesson and recall prior knowledge related to matter.

Step 2: Explanation of Atom and its Basic Parts

Time: 10 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher defines an atom using simple language. Using an atom chart, the teacher points out and explains the basic parts of an atom: protons, neutrons (in the nucleus), and electrons (orbiting the nucleus). The teacher emphasizes their charges and locations.
Pupils’ Activity: Pupils listen, observe the chart, and take notes. They may ask questions for clarification.
Learning Point: Pupils understand the definition of an atom and can identify its fundamental components.

Step 3: Description of Simple Atomic Structure

Time: 10 minutes
Teaching Skill: Demonstration/Visualisation
Teacher’s Activity: The teacher uses a diagram or draws on the board to illustrate the simple structure of an atom, showing the nucleus at the center and electrons orbiting in shells. The teacher explains that the number of protons equals the number of electrons in a neutral atom.
Pupils’ Activity: Pupils observe the diagrams, ask questions, and try to visualize the atomic structure.
Learning Point: Pupils can describe the arrangement of particles within a simple atom.

Step 4: Linking Atomic Structure to Electric Current

Time: 10 minutes
Teaching Skill: Explanation/Connection
Teacher’s Activity: The teacher explains that electric current is the flow of electric charge. The teacher then explains how the valence electrons in the outermost shell of some atoms (conductors) can become “free electrons” and move from one atom to another, thus constituting electric current when directed.
Pupils’ Activity: Pupils listen carefully and participate in a brief discussion on how electrons cause current flow.
Learning Point: Pupils understand how the movement of electrons relates to electric current.

Step 5: Practical Drawing of an Atom

Time: 5 minutes
Teaching Skill: Practical Application
Teacher’s Activity: The teacher distributes drawing materials or instructs pupils to draw a simple diagram of an atom in their notebooks, showing the nucleus and orbiting electrons.
Pupils’ Activity: Pupils draw a simple diagram of an atom.
Learning Point: Pupils practice drawing and reinforcing their understanding of atomic structure.

Step 6: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

Define an atom.
Mention three basic parts of an atom.
Describe the arrangement of particles in a simple atom.
Explain how atomic structure relates to the flow of electric current.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 7: Conclusion

Time: 2 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the importance of atomic structure in understanding electricity. The teacher assigns pupils to research different types of materials based on their conductivity (conductors, insulators, semiconductors) for homework.
Pupils’ Activity: Pupils listen to the summary and copy down the homework.
Learning Point: Pupils reinforce their understanding and are prepared for future lessons.

Lesson Keywords

Atom – The smallest unit of matter that retains an element’s chemical identity.
Proton – A positively charged particle found in the nucleus of an atom.
Neutron – A neutral particle (no charge) found in the nucleus of an atom.
Electron – A negatively charged particle that orbits the nucleus of an atom.
Nucleus – The dense, central core of an atom containing protons and neutrons.
Electric Current – The flow of electric charge, typically carried by free electrons.
Free Electron – An electron that is not bound to an atom and can move freely within a material.

Differentiation

For struggling learners, the teacher will provide simplified diagrams and allow more time for drawing. Advanced learners will be encouraged to research and explain the concept of electron shells and energy levels in more detail, or to consider how different materials (conductors, insulators) differ in their atomic structure regarding free electrons.

Note for teachers using this lesson plan

Ensure that the atom charts or diagrams used are clear and easy for pupils to understand. Emphasize the concept of “free electrons” as it is fundamental to understanding electric current. Encourage pupils to ask questions, especially when connecting abstract atomic structure to observable electric current.