Lesson Notes By Weeks and Term v5 - Grade 10

Lesson Video

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Performance objectives

• Identify and describe key hardware components.
• Differentiate between system and application software.
• Explain the role of the operating system (OS).
• Compare different types of storage devices.
• Discuss the basics of operating system security.

Lesson summary

This week, we delve into the fundamental building blocks of any computer system: hardware, software, and operating systems. Understanding how these components work together is crucial in today's digital age, influencing everything from how you use your smartphone to how businesses operate and governments function. In South Africa, a solid grasp of computer systems is essential for participating in a modern economy, accessing information, and even starting your own tech-driven business.

Lesson notes

2.1 Hardware Hardware refers to the physical components of a computer system that you can see and touch. These components work together to perform tasks based on instructions from software. Let’s explore the major hardware components: Central Processing Unit (CPU): Often called the "brain" of the computer. It executes instructions from software, performing calculations, making logical decisions, and controlling the flow of data. CPU performance is measured in Hertz (Hz) and often expressed in Gigahertz (GHz). The higher the GHz, generally the faster the CPU (though other factors also affect performance).

Example:* Imagine a stokvel administrator using spreadsheet software. The CPU handles all calculations related to contributions, payouts, and interest earned.

Random Access Memory (RAM): Temporary storage for data and instructions that the CPU is actively using. It's volatile, meaning data is lost when the power is turned off. RAM is crucial for smooth multitasking. More RAM means the computer can handle more tasks simultaneously without slowing down.

Example:* When you have multiple tabs open in your web browser, each tab's data is stored in RA

M. The more RAM you have, the more tabs you can open without experiencing lag.

Storage Devices: Used to permanently store data, applications, and the operating system.

Common types include: Hard Disk Drive (HDD): A traditional storage device that uses spinning magnetic disks to store data. HDDs are relatively inexpensive and offer large storage capacities, but they are slower than SSDs.

Solid State Drive (SSD): Uses flash memory to store data. SSDs are much faster than HDDs, consume less power, and are more durable.

However, they are generally more expensive than HDDs.

USB Drives (Flash Drives): Portable storage devices that connect to a computer via US

B. They are convenient for transferring files between computers.

Example:* An HDD might store the entire collection of South African music and films you have downloaded. An SSD makes your computer start up quicker.

Input Devices: Allow you to enter data and instructions into the computer.

Common examples include: Keyboard Mouse Touchscreen Microphone Webcam

Example:* A teacher uses a keyboard to type lesson plans into a word processor, or a learner uses a touchscreen on their tablet to complete online assignments.

Output Devices: Display or present data processed by the computer.

Common examples include: Monitor Printer Speakers Projector

Example:* A monitor displays the results of a calculation, or a printer produces a hard copy of a document. 2.2 Software Software is a set of instructions that tells the hardware what to do. It can be broadly classified into two categories: System Software: Manages and controls the hardware and provides a platform for running application software. The most important piece of system software is the Operating System (OS).

Examples of Operating Systems:* Windows, macOS, Linux (Ubuntu is a popular distribution), Android, iO

S. Application Software: Designed to perform specific tasks for the user.

Examples of Application Software:* Word processors (Microsoft Word, Google Docs), spreadsheets (Microsoft Excel, Google Sheets), web browsers (Chrome, Firefox), media players (VLC, Spotify), accounting software (Pastel), gaming software.

Example for South Africa:* SARS eFiling software is an application that runs on an operating system (like Windows) to allow taxpayers to submit their tax returns. Another example is MoyaApp, a messaging application commonly used in South Africa that runs on the Android operating system. 2.3 Operating Systems The operating system (OS) is the most important piece of software on a computer. It acts as an intermediary between the hardware and the application software.

The OS performs several key functions: Resource Management: The OS manages all the hardware resources of the computer, including the CPU, RAM, storage devices, and input/output devices. It allocates resources to different applications as needed, ensuring that they don't conflict with each other.

Example:* When you run multiple programs at the same time (e.g., a web browser, a word processor, and a music player), the OS manages the CPU time and RAM allocation for each program, preventing them from crashing or interfering with each other.

User Interface: The OS provides a user interface (UI) that allows you to interact with the computer. The UI can be either a graphical user interface (GUI) or a command-line interface (CLI). A GUI uses windows, icons, and menus to make it easy to use a computer with a mouse or touchscreen. A CLI uses text-based commands that you type in.

Example:* Windows and macOS have GUIs, which allow you to click on icons to open programs and use menus to perform tasks. Linux often offers choices between GUI and CLI interfaces.

File Management: The OS manages files and folders on the storage devices. It allows you to create, delete, copy, move, and rename files and folders.