Lesson Notes By Weeks and Term - Senior Secondary 1

Term: 2^nd Term

Week: 4

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 2 periods each

Date:       

Subject:      Computer Studies and ICT

Topic:-       Computer System: Operating system

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Define operating system
2. Outline the functions of the operating system
3. Discuss the types of operating system giving examples of each

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, pictures, Data Processing for senior Secondary Education by Hiit Plc, WAPB Computer Studies for Senior Secondary I by Adekunle et al, On-line Materials.

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

OPERATING SYSTEM

Operating system is a suite/set (collection) of programs/software that controls the execution of application programs and coordinates/manages the hardware components. It can also be defined as a set of programs that controls and manages computer resources/components and provides other useful services. The purpose of an operating system is to provide an environment in which a user can execute programs in a convenient and efficient manner.

 Functions of Operating system

1. Serves as an interface between the user and the computer/hardware and software
2. Access control/ System Security:By means of password and other similar access control techniques the OS prevents unauthorized access to programs and data.

iii. Controls program execution: The OS runs and control all other system programs and application software

1. Booting/Starting up the computer:The operating system manages the starting up of the computer
2. Controls hardware resources
3. File-system manipulation (for users and their programs) - read and write files and directories, create and delete them, search them, list file Information, permission management.

vii. Control over system performance:  The OS records the delay between the request for a service and the response from the system and manages the situation accordingly.

viii. Protects the system from errors and failures/error handling

1. Task management:The OS gives control to the program the user brings to the foreground (from among multiple opened programs).
2. Device management:The device management function controls hardware devices by using special software called device drivers, which are installed in the operating system. This makes the operating system recognize the device.
3. Memory management

Examples of Operating system

Operating system can be grouped into two, namely, the Graphical User Interface (GUI) and the Command Line Interface (CLI).

1. The GUIgroup makes use of windows, icons, mouse, scroll bar, and Pointer. In this group, we have the Microsoft series (Windows 95, 98, NT/2000, ME, XP, Vista, 7, 8,10), Chrome OS, Apple System 7 and macOS, Linux variants like Ubuntu.

2. The CLIgroup includes the IBM Disk Operating system (DOS) that is phased out, the Microsoft Disk Operation System (MS-DOS) and UNIX. The Command line is a text-based interface that allows the user to interact with the computer system by typing in commands (instructions).

EVALUATION:    1. Define Operating system

2. Highlight five functions of the operating system
3. Discuss the two types of operating system giving one                    example of each

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively