Class: Senior Secondary School 1 (SS1 / SSS 1)
Term: 1st Term
Week: 10
Age: 15 years
Duration: 45 minutes
Subject: Electrical Installation and Maintenance Work
Curriculum Theme: Technology
Previous Lesson: Working Drawing: Electrical Symbols and Drawing Types.
Topic: ELECTRICAL ACCESSORIES
Subject Matter: Definition of electrical accessories, types of electrical accessories, identification of accessories such as switch socket outlet, basic uses of common accessories.

Specific Objectives

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

Cognitive Domain:

Define electrical accessories.
Mention different types of electrical accessories.
State the basic uses of common electrical accessories.

Affective Domain:

Appreciate the importance of correct identification of electrical accessories.
Value the role of different accessories in electrical installations.

Psychomotor Domain:

Identify common electrical accessories such as switches and socket outlets.
Differentiate between various types of electrical accessories when shown samples.

Participate actively in group discussions about electrical accessories.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Electrical Installation and Maintenance Work (Senior Secondary Education).
State Unified Scheme of Work for Electrical Installation and Maintenance Work (SS1).
Ejike, C.O. (2018). Electrical Installation Practice for Senior Secondary Schools. Lagos: Learn Africa Plc.

Instructional Materials

The teacher will teach this lesson with the aid of:

Actual samples of a switch.
Actual samples of a socket outlet.
A sample set of other common electrical accessories (e.g., plug, lamp holder).
Chalkboard and chalk.

Rationale for the Lesson

This lesson helps pupils understand the basic components used in electrical wiring and their functions. Knowing about electrical accessories enables pupils to identify them correctly and understand their importance in safe and functional electrical installations in homes and offices.

Prerequisite/Previous Knowledge

Pupils are assumed to have some basic knowledge of electricity and simple electrical circuits from earlier lessons.

Lesson Content/Board Summary

ELECTRICAL ACCESSORIES

Definition of Electrical Accessories

Electrical accessories are devices used in an electrical installation to enable the control, connection, protection, and distribution of electricity. They are not the main conductors but are essential for the functionality and safety of the electrical system.

Types of Electrical Accessories

Electrical accessories can be broadly classified based on their function. The following are common types of electrical accessories:

Switches: Devices used to make or break an electrical circuit, thereby controlling the flow of current to a load (e.g., light bulb).
Socket Outlets: Receptacles into which electrical plugs are inserted to connect appliances to the main electrical supply.
Plugs: Devices fitted to the end of a flexible cable of an appliance, designed to be inserted into a socket outlet to draw power.
Lamp Holders: Devices designed to hold a light bulb and connect it electrically to the circuit.
Ceiling Roses: Decorative fittings installed on the ceiling from which pendant lamp holders are suspended.
Junction Boxes: Enclosures for concealing and protecting electrical connections (junctions) in a circuit.
Conduit Fittings: Accessories used to join, terminate, or change direction of conduits (pipes for protecting wires).
Distribution Boards (DB): Centralized points where the incoming electrical supply is divided into separate circuits, each protected by a circuit breaker or fuse.

Identification and Basic Uses of Common Accessories

The following are common electrical accessories and their basic uses:

Switch: Used to turn electrical appliances (like lights or fans) ON or OFF.
Socket Outlet: Provides a point of connection for portable electrical appliances (e.g., TV, fan, phone charger) to the power supply.
Plug: Connects an appliance to a socket outlet.
Lamp Holder: Holds a light bulb and connects it to the electrical circuit to provide illumination.

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 to mention any electrical items they use daily in their homes or school. The teacher then guides them to think about how these items are connected or controlled.
Pupils’ Activity: Pupils respond by mentioning items like light bulbs, fans, TVs, and state how they are controlled (e.g., with a switch, by plugging in).
Learning Point: Pupils recall previous knowledge and are introduced to the concept of electrical components beyond the main appliance.

Step 2: Definition of Electrical Accessories

Time: 8 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines electrical accessories, writing the definition on the board. The teacher explains that these are components that allow us to control, connect, and protect our electrical systems.
Pupils’ Activity: Pupils listen attentively and copy the definition into their notebooks.
Learning Point: Pupils understand the meaning of electrical accessories.

Step 3: Types of Electrical Accessories

Time: 10 minutes
Teaching Skill: Listing/Demonstration
Teacher’s Activity: The teacher lists and briefly explains different types of electrical accessories, such as switches, socket outlets, plugs, and lamp holders. The teacher displays actual samples of these accessories while explaining.
Pupils’ Activity: Pupils observe the displayed samples, listen to the explanations, and note down the types of accessories.
Learning Point: Pupils become familiar with various types of electrical accessories.

Step 4: Identification of Common Accessories

Time: 7 minutes
Teaching Skill: Identification/Observation
Teacher’s Activity: The teacher holds up each sample accessory (switch, socket outlet, plug, lamp holder) one by one and asks pupils to identify them by name and state their visible features.
Pupils’ Activity: Pupils actively participate by identifying the accessories and describing them.
Learning Point: Pupils are able to correctly identify common electrical accessories.

Step 5: Basic Uses of Common Accessories

Time: 5 minutes
Teaching Skill: Explanation/Application
Teacher’s Activity: The teacher explains the basic uses of the identified accessories, emphasizing their roles in controlling and connecting electrical loads. For example, a switch turns lights on/off, a socket outlet powers appliances.
Pupils’ Activity: Pupils listen and ask questions for clarification, noting the uses in their books.
Learning Point: Pupils understand the practical application of each accessory.

Step 6: Class Discussion

Time: 5 minutes
Teaching Skill: Questioning/Engagement
Teacher’s Activity: The teacher facilitates a brief discussion, asking pupils to share where they have seen these accessories used in their daily lives and why they are important.
Pupils’ Activity: Pupils contribute to the discussion, relating the lesson to real-world examples.
Learning Point: Pupils reinforce their understanding through practical examples and peer interaction.

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 electrical accessories.
Mention three types of electrical accessories.
What is the basic use of a socket outlet?
Identify the accessory shown (teacher holds up a switch).

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarizing
Teacher’s Activity: The teacher summarizes the key points of the lesson, reiterating the definition, types, and uses of electrical accessories. The teacher gives homework: Draw and label any three electrical accessories.
Pupils’ Activity: Pupils listen to the summary and copy the homework.
Learning Point: Pupils consolidate their learning and prepare for independent practice.

Lesson Keywords

Accessory – A device used in an electrical installation for control, connection, or protection.
Switch – A device to open or close an electrical circuit.
Socket Outlet – A point in the wiring system where an appliance can be connected.
Plug – A device attached to a flexible cable for connecting an appliance to a socket outlet.
Lamp Holder – A device that holds a light bulb and connects it to the electrical supply.

Differentiation

For pupils who grasp concepts quickly, the teacher can ask them to research and present on more complex accessories like circuit breakers or earth leakage circuit breakers. For pupils needing more support, the teacher will provide additional visual aids and one-on-one guidance during the identification and usage explanation steps.

Note for teachers using this lesson plan

It is important to have actual, safe, non-energized samples of electrical accessories for demonstration. Emphasize safety aspects when discussing the uses and installation of these components, even if not directly covered in this lesson.