Basic Technology Lesson Note JSS 3 Frist Term
Basic Technology Scheme of Work for JSS3 First Term
WEEK 1 REVISION OF LAST TERM EXAM
WEEK 2 CAREER PROSPECTS AND OPPORTUNITIES IN TECHNOLOGY
WEEK 3 PRODUCTION OF MATERIALS – WOOD (CONTD.)
WEEK 4 PRODUCTION OF MATERIALS – METALS
WEEK 5 PRODUCTION OF MATERIALS – CLAY, CERAMIC AND GLASS
WEEK 6 PRODUCTION OF MATERIALS – PLASTICS AND RUBBER
WEEK 7 ISOMETRIC DRAWING
WEEK 8 OBLIQUE DRAWING
WEEK 9 ORTHOGRAPHIC PROJECTION
ONE-POINT PERSPECTIVE DRAWING
PROCESSING OF MATERIALS (WOOD) – CONTD.
BASIC TECHNOLOGY JSS 3 (1ST TERM WEEK 4)
Basic Technology JSS3 First Term
Below are the 2022 complete basic technology lesson notes for Jss 3 First term
Topic: Revision of Last Term Exam
Topic: Career Prospects and Opportunities in Technology
Technology is a family of professions. It involves artisans, craftsmen, technicians, engineers and scientists, all these professions are involved in the development and production of the different products of technology that we are enjoying today.
Technology professionals work in every sector of our economy. When you fly in a plane, drive a car, walk or drive across a bridge, make telephone calls, watch on television football matches being played several thousand kilometres away, or go under an x-ray machine to reveal broken bones, you are experiencing some of the products of technology.
Technology professionals work daily not only to operate and maintain these products but also to develop new products and processes. Thus, technology professionals are always thinking of new ways of doing things. This is what is called innovation. To learn more, Click here
Topic: Processing of Materials – Wood (contd.)
Wood is obtained from trees that grow all around us. However, wood cannot be used to produce the materials needed domestically and industrially, if the wood does not pass through the necessary stages of being processed.
Wood conversion is the process of splitting the log at a sawmill with sawing machines into commercial and/or marketable sizes. The two popular methods of conversion are: ‘plain sawn’ and ‘quarter sawn’.
The plain-sawn method also commonly called flat-sawn, is the most common type of lumber cut you will find. Many operators prefer this method because it is a simple, cheap and fast way to convert logs into planks suited to various needs. The annular rings are generally 30 degrees or less to the face of the board; this is often referred to as a tangential grain. The log is converted into planks by cutting more attention than the plain-sawn method because the log has to be turned. The planks produced by this method have stripe figures. To learn more, Click here
Topic: Production of Materials – Metals
Meaning of Metal
Metals are materials used in producing some equipment used in everyday life. Metals are usually solid but a few ones are in liquid or powder form. They are made from raw forms called ores. We will discuss how metals are produced from ores and metal alloys are formed. Metals come in different forms such as rods, tubes, plates, wires, bars liquid (e.g. mere) ferrous metals contain iron but non-ferrous metals do not.
This topic has three units:
- Production of metals: smelting and casting, etc.
- Carbon properties of steel
- Metal alloys To learn more, Click here
Topic: Production of Materials – Clay, Ceramic and Glass
- Methods of making clay
- Stages in producing Ceramics and glass materials e.g. Shaping, blowing etc.
Ceramics and glass are non-metallic materials used to mould different shapes and items needed for domestic and commercial applications. The moulds are produced through different processes and methods.
Section 1: Method of Making Clay
Mud (clay is dug from the earth. This is then pounded with little water until it forms a paste (becomes malleable). The soft mud is then used to from different shapes before it solidifies.
It can be used to make difference by putting the mud in moulds representing the object one intends to make. School children can use it to mould objects like pressing iron, cars, human beings, reptiles, etc.
The soft mud can also be used to make bricks by sharpening it with rectangular moulds. These moulds are removed after one or two minutes. The shape or the object formed is then put in the sun to dry. To learn more, Click here
Topic: Production of Materials – Plastics and Rubber
- Methods of Producing Plastics
- Methods of producing Rubber
There are many ways from many ways of making plastics from molten materials. The choice of methods depends on the plastic product to be made and its use. A popular method of making thermoplastics is injection moulding. The resins in the required colours are fed into the hopper.
The resins are heated in the heating chamber between the hopper and the mould. The right amount of the molten material is then forced by the plunger into the mould. The plastic article is formed as it is forced into the mould. The article stays in the mould until it is completely cool; then it is removed. Plastic products such as valves and the air-make grill of an air conditioner nylon hair comb are made by the injection moulding method. To learn more, Click here
Topic: Isometric Drawing
- Meaning of Isometric Drawing
- Isometric Axes
- Isometric Drawing of Simple Shaped Blocks
- Drawing Isometric Blocks with Freehand
Meaning of Isometric Drawing
Isometric drawing is a pictorial method of drawing which shows the three faces of an object together. It is a clear way of presenting information about the physical outlook of an object. An isometric drawing is constructed by using a pair of set squares. The receding lines (Isometric lines) are drawn at 30o to the horizontal plane or x – y line while the other lines are vertical.
Isometric drawings help students to develop their imagination. To learn more, Click here
- Oblique drawing
This is also a pictorial method of drawing, in oblique projection, the object is drawn with one of its faces true to dimensions i.e. a face is parallel to its horizontal plane. The receding lines (oblique lines) may be drawn at angle 30o, 45o, or 60o, but 45o is mostly used. One disadvantage of oblique drawing is that it distorts the drawing and can never look natural. Therefore in order to prevent this distortion, the receding axes (widths) are usually drawn half-size. To learn more, Click here
Topic: Orthographic Projection
Orthographic projection is a method of drawing an object be means of plane views. While isometric drawing looks at all three views (or faces) of an object together, orthographic look at the same three views separately but linked together. In orthographic projections, we can look at each view and see its “correct or true shape”.
Orthographic projection is the only drawing that shows the shape, angles and size of each part of the article to be constructed as they really are. Because of this peculiar characteristic, it is one of the universally accepted drawings in the construction industry, therefore the drawing is usually used for production purposes. Ordinary pictorial drawing is not sufficient to build a house or fabricate parts of a machine. What is most needed is an orthographic projection of the article. To learn more, Click here
Topic: One-Point Perspective Drawing
One point perspective can be defined as:
“…a mathematical system for representing three-dimensional objects and space on a two-dimensional surface by means of intersecting lines that are drawn vertically and horizontally and that radiate from one point on a horizon line…”
Although this definition sounds complicated, the concept is relatively simple. One point perspective is a drawing method that shows how things appear to get smaller as they get further away, converging towards a single ‘vanishing point’ on the horizon line. It is a way of drawing objects upon a flat piece of paper (or other drawing surface) so that they look three-dimensional and realistic.To learn more, Click here