This FREE BASIC TECH Lesson Note was pulled from our book (Lesson Note on BASIC TECH for JSS2 MS-WORD); Compiled to serve as a reference material to help teachers draw out their lesson plan easier, saving you valuable time to focus on the core job of teaching.
The Lesson notes are based on the current NERDC curriculum (UBE compliant)
This FREE BASIC TECH Lesson Notes Covers the Following Topics
1. INFORMATION AND COMMUNICATION TECHNOLOGY
2. INFORMATION AND COMMUNICATION TECHNOLOGY (2)
3. TRANSMISSION SYSTEM OF GSM
4. FIRST AID AND MATERIALS
5. MATERIAL AND THEIR COMMON USES
6. GEOMETRICAL CONSTRUCTION
7. GEOMETRICAL CONSTRUCTION (ANGLES)
8. GEOMETRIC CONSTRUCTION (CIRCLES)
9. TRIANGLE
10. RESCUE OPERATION
11. CONSTRUCTION AND SKETCHES
12. INFORMATION AND COMMUNICATION TECHNOLOGY (1)
13. INFORMATION AND COMMUNICATION TECHNOLOGY (2)
14. PLANE FIGURE
15. AREA OF PLANE FIGURES
16. WOOD WORK MACHINES
17. METAL WORK MACHINES
18. METAL WORK MACHINES (CONTINUED)
19. FRICTION
20. FRICTION (CONTINUED) ENERGY BASED TECHNOLOGICAL APPLIANCES
21. PRINCIPLES OF OPERATION OF AC MOTOR MACHINES
22. PRINCIPLES OF OPERATION OF BICYCLES, GENERATORS, DYNAMOS
23. TRANSMISSION OF ELECTRICITY
24. TRANSMISSION OF ELECTRICITY BUILDING SITE PREPARATION
25. SETTING OUT
26. MAINTENANCE OF DOMESTIC APPLIANCES
27. MAINTENANCE OF DOMESTIC APPLIANCES
28. BELT AND CHAIN DRIVES
29. ADVANTAGES AND DISADVANTAGES OF BELT AND CHAIN DRIVES
30. GEARS
31. GEARS (C0NTINUED)
32. PRINCIPLES OF EVAPORATION LEADING TO COOLING BY REFRIGERANTS
Sample note
Topic: Information and Communication Technology
Content
- Analogue and Digital Communication system
- The merits and demerits of analogue and Digital Communication system
Information has been very important in business, politics, education and sports in particular and all walks of life in general. Several research works have been done on ways to improve communication of information from one location to another (point-to-point) and from location to many locations (point-to-multipoint). The technology for transferring information started with analog communication system and it has now been improved to digital communication system which offers efficiency, better performance and greater flexibility.
Analog and Digital Communication Systems
Analog communication systems can send along signals from one location to another or from one location to many locations. An analog signal is a continuously varying waveform that is similar to a voice or sound wave. One of the signals used in analog communication is Amplitude Modulation Radio Signal.
Digital communication systems can transmit real valued discrete time signals. A digital signal is a sequence of discrete pulses of 1’s and 0’s. Global system for mobile communication (G.S.M) signal is an example of digital communication system.
Although, analog systems are less expensive in many cases than digital ones for the same application, digital systems offer greater efficiency, better performance and greater flexibility.
In addition to digital communication’s ability to transmit a variety of signals than analog systems, point-to-point digital systems can be organized into global systems that provide efficient and flexible information transmission.
Digital. Analog. The block diagram on the top shows the blocks common to all communication systems.
The Merits and Demerits of Analog and Digital Communication System
Advantages of Digital Communication System
- Less expensive
- More reliable
- Easy to manipulate
- Flexible
- Compatibility with other digital systems
- Only digitized information can be transported through a noisy channel without degradation
- Integrated networks
Disadvantages of Digital Communication System
- Sampling Error
- Digital communications require greater bandwidth than analogue to transmit the same information.
- The detection of digital signals requires the communications system to be synchronized, whereas generally speaking this is not the case with analogue systems.
Advantages of Analogue Communication System
- Uses less bandwidth
- More accurate
Disadvantages of Analogue Communication System
- The effects of random noise can make signal loss and distortion impossible to recover.
ASSESSMENT
- Differentiate between Analog and Digital communication system?
- List FIVE merit of digital communication system?
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