JSS3 Basic Technology Lesson Note on Simple Electrical Wiring

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TOPIC: SIMPLE ELECTRICAL WIRING

SUB-TOPICS:

ELECTRICAL CIRCUIT

• Meaning of electrical circuit and types
• Wiring tools and materials

Content Development (NOTES FOR FIRST LESSON/PERIOD ONE)

Sub-Topic 1:    Meaning of electrical circuit and types.

An electric circuit is a system that consists of the load, source of electricity, the key or switch and the connecting wires.

There are two types of electrical circuits (i) Series circuit and (ii) parallel circuit.

Series circuit: In this arrangement, the load (resistors) is connected end to end. The same current flows through all appliances. If one stops functioning, the others stop.

Parallel circuit:  In this arrangement, the load(resistors) are connected side by side in parallel order. The same voltage is used. A fault which may occur in one electrical path will not affect the others.

Evaluation

• What is an Electrical circuit?
• Differentiate between series circuits and parallel circuits.

Content Development (NOTES FOR SECOND LESSON/PERIOD TWO)                              

Wiring tools and materials

Electrical wiring is an arrangement whereby electrical loads are connected to the mains supply. A good wiring protects the user from electric shock and prevents fire outbreak.

Wiring tools are tools used for wiring and installation of circuits in homes, offices and other building structures and equipment.

Wiring tool	Uses
Pliers	Used for cutting cables and twisting together wire ends
Screw driver	Used for tightening screws to wooden blocks and fixing electrical accessories in position
Clips	They are used to fasten electrical cables to the wall or ceiling.
Hammer	It is used to drive nails through clips into the wall.
Mallet	It is used to straighten out hunches in wires during surface wiring.
Drilling machine	It is an electrically power machine used for making holes in walls or wooden blocks.
Screws and nails Tester                                             Cable	They are used to hold the cable and electrical accessories in position. It is used to check where live current flows in the circuit. It is the insulated wire that provides electrical connection between the electrical load and the supply point.

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