SIMPLE ELECTRICAL WIRING JS 3 (BASIC 9) BASIC TECHNOLOGY SECOND TERM WEEK 6
SECOND TERM: E-LEARNING NOTES
JS 3 (BASIC 9)
SUBJECT: BASIC TECHNOLOGY
SCHEME OF WORK
WEEK: SIX
SECOND TERM: E-LEARNING NOTES
JS 3 (BASIC 9)
SUBJECT: BASIC TECHNOLOGY
SCHEME OF WORK
DATE:
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 (ii) parallel circuit.
Series circuit: In this arrangement, the load(resistors) are connected end to end. The same current flows through all appliances. If one stops functioning, the others stop.
Series circuit
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.
Parallel circuit
Evaluation
- What is Electrical circuit?
- Differentiate between series circuit and parallel circuit.
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. |
Electrical accessories are devices other than lighting fittings associated with the wiring and current utilizing appliances of an installation. Accessories are rated for the maximum voltage or current they are designed to withstand without undue over-heating or failure. These include switches, lamp holders, ceiling roses, joint boxes, fuse boxes, socket plugs, connectors, adaptors etc.
Switches: These are used to control the flow of current through a particular point.
Lamp holders: They are used to hold light bulbs when fixed to the ceiling or wall.
Wall socket and plugs: They are located on the walls for the drawing of current by appliances
Diagram
Evaluation
1. Mention four tools used in electrical wiring and their uses.
2. Mention three electrical accessories and their uses.
Weekend Assignment
Draw four wiring tools and three electrical accessories.
Reading Assignment
The students should read about Simple Electrical wiring, NERDC Basic Technology for Junior Secondary School 3.