Lesson Notes By Weeks and Term v5 - Grade 10

Lesson Video

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Performance objectives

• Identify key hardware components and their functions.
• Explain the role and functions of an operating system (OS).
• Differentiate between common operating systems.
• Describe the boot process and the role of BIOS/UEFI.
• Understand the concept of system software.

Lesson summary

In this week's lesson, we will delve into the fascinating world of computer hardware and operating systems. Understanding the different components that make up a computer and how the operating system manages these components is crucial in today’s digital age. From using your smartphone to accessing educational resources online or applying for jobs, computers and operating systems play a vital role. This knowledge empowers you not just as users, but also as informed citizens capable of understanding and engaging with technology effectively. This understanding will also benefit you significantly as you progress in your CAT studies and potentially pursue careers involving technology.

Lesson notes

2. 1. Computer Hardware Components A computer system is more than just the monitor and keyboard you see. It's a collection of interconnected physical components working together.

Here are the key components: Central Processing Unit (CPU): Often called the "brain" of the computer. The CPU executes instructions from programs. It fetches instructions, decodes them, and performs the actions. The CPU’s performance is often measured in Hertz (Hz) – gigahertz (GHz) is common today. A higher clock speed generally indicates faster processing, but it's also important to consider the number of cores (e.g., dual-core, quad-core, octa-core). More cores allow the CPU to handle multiple tasks simultaneously.

Example: Imagine a street vendor selling vetkoek. The CPU is like the vendor deciding who to serve next (fetching), understanding their order (decoding), and then preparing the vetkoek (executing). A vendor with two hands (dual-core) can obviously make more vetkoek faster than a vendor with one hand!

Random Access Memory (RAM): Think of RAM as the computer's short-term memory. It's a fast type of memory that stores data and instructions that the CPU is currently using. When you open a program, it's loaded into RAM. When you close the program, the data is removed from RAM. RAM is volatile, meaning it loses its data when the power is turned off. More RAM allows you to run more programs simultaneously without slowing down the computer. RAM is measured in Gigabytes (GB).

Example: Back to the vetkoek vendor, RAM is like their workbench. They keep the ingredients and tools they are currently using on the workbench for easy access. When they are finished making a vetkoek, they clear the workbench. If they have a small workbench, they have to keep getting ingredients, slowing them down.

Hard Drive/Solid State Drive (HDD/SSD): This is the computer's long-term storage. It stores your operating system, applications, and files (documents, photos, videos, etc.). HDDs use spinning magnetic disks to store data, while SSDs use flash memory (like a USB drive). SSDs are generally faster, more durable, and quieter than HDDs, but they are also typically more expensive. Storage capacity is measured in Gigabytes (GB) or Terabytes (TB).

Example: The vetkoek vendor's storeroom is like the hard drive or SSD. It holds all the ingredients, equipment and recipes they need. A bigger storeroom can hold more supplies.

Motherboard: The motherboard is the main circuit board that connects all the other components together. It provides the communication pathways between the CPU, RAM, storage devices, and other peripherals.

Example: The motherboard is like the roads and highways of a city. It allows all the different parts of the city (CPU, RAM, storage, etc.) to communicate and exchange information.

Input/Output (I/O)

Devices: These are the devices that allow you to interact with the computer. Input devices allow you to enter data (e.g., keyboard, mouse, microphone, scanner), while output devices allow the computer to display or present data (e.g., monitor, printer, speakers).

Example: The keyboard is like a pen, you use it to write instructions. The monitor is like a notice board showing what is going on. 2.

2. Operating Systems (OS) The operating system (OS) is the software that manages all the hardware and software resources of a computer system. It acts as an intermediary between the user and the hardware, providing a user-friendly interface for interacting with the computer.

Key Functions of an OS: Resource Management: The OS allocates resources (CPU time, memory, storage space, I/O devices) to different programs and users. This ensures that each program has the resources it needs to run effectively and prevents conflicts between programs.

Process Management: The OS manages the execution of programs (processes). It creates, schedules, and terminates processes, ensuring that each program gets a fair share of CPU time.

Memory Management: The OS allocates and manages memory space for different programs. It prevents programs from interfering with each other's memory and ensures that memory is used efficiently.

File Management: The OS organizes and manages files and directories. It provides a file system that allows users to create, delete, rename, and move files and directories.

Input/Output Management: The OS manages communication between the computer and its I/O devices. It provides device drivers that allow the OS to communicate with different types of devices.

User Interface: The OS provides a user interface (UI) that allows users to interact with the computer. The UI can be either a graphical user interface (GUI), which uses icons and windows, or a command-line interface (CLI), which uses text-based commands.

Security: The OS provides security features that protect the computer from unauthorized access and malicious software.

Examples of Operating Systems: Windows: A popular OS developed by Microsoft.