Lesson Notes By Weeks and Term v5 - Grade 10

Lesson Video

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Performance objectives

• Identify and categorize hardware components.
• Explain the difference between system and application software.
• Describe the function of an operating system (OS).
• Differentiate between types of application software.
• Explain the concept of a computer network (LAN vs. WAN).

Lesson summary

This week, we're diving deeper into the fundamental building blocks of computers: hardware and software. Understanding these concepts is crucial not only for Computer Applications Technology (CAT) but also for navigating the increasingly digital world in South Africa and globally. Whether you're applying for a job online, using mobile banking, or even controlling traffic lights, computers and their underlying hardware and software are at play. For many of you, this might seem very obvious, but a solid foundation in these concepts is ESSENTIAL to successfully engaging in CAT and ICT in the long run.

Lesson notes

2.1 Hardware: The Tangible Components Hardware refers to the physical components of a computer system that you can touch and see. It's the "body" of the computer. Hardware can be classified into four main categories: Input Devices: These devices allow you to enter data and instructions into the computer.

Examples include: Keyboard:* For typing text and commands. Think of typing an essay for your English class.

Mouse:* For pointing, clicking, and navigating. Imagine selecting a song on Spotify.

Microphone:* For recording audio. Think of recording a voice note on WhatsApp.

Scanner:* For converting physical documents into digital images. Imagine scanning your ID book at Home Affairs.

Webcam:* For capturing video. Think of video calling your family overseas.

Output Devices: These devices display or present processed data to the user.

Examples include: Monitor:* Displays visual information. Think of watching videos on YouTube.

Printer:* Produces hard copies of documents. Think of printing your school project.

Speakers:* Output audio. Think of listening to music.

Projector:* Displays images on a large screen. Think of watching a movie at an outdoor cinema.

Processing Devices: These devices perform calculations and control the flow of data within the computer. The most important processing device is the Central Processing Unit (CPU).

CPU (Central Processing Unit):* The "brain" of the computer. It executes instructions and performs calculations. Its speed is measured in Hertz (Hz), Kilohertz (kHz), Megahertz (MHz), and Gigahertz (GHz). A faster CPU means quicker processing. Think of how fast your phone opens an app. That's largely determined by the CP

U. The higher the GHz, generally the faster the processing of information.

Motherboard:* The main circuit board that connects all the other components.

Storage Devices: These devices store data and instructions for later use.

Hard Disk Drive (HDD):* A traditional storage device that uses magnetic platters to store data. It's generally cheaper and offers larger storage capacity than SSDs, but is slower and more prone to damage. Think of storing all your music, photos, and documents on your laptop.

Solid State Drive (SSD):* A newer type of storage device that uses flash memory to store data. It's faster, more durable, and consumes less power than HDDs, but is generally more expensive. Think of the storage drive in your modern smartphone.

USB Flash Drive (Memory Stick):* A portable storage device that connects to a computer via a USB port. Think of transferring files between computers.

Memory Cards (SD cards):* Used in digital cameras and mobile phones to store data. 2.2 Software: The Intangible Instructions Software refers to the set of instructions that tell the hardware what to do. It's the "soul" of the computer. Software can be classified into two main categories: System Software: This type of software manages the hardware and provides a platform for application software to run. The most important type of system software is the operating system (OS).

Operating System (OS):* The OS is the foundation of all software activities. It manages hardware resources, provides a user interface, and runs applications.

Examples include: Windows:* The most popular OS for personal computers. Widely used in schools, businesses, and homes across South Africa. macOS:* The OS for Apple computers. Common in creative industries.

Linux:* An open-source OS that is known for its flexibility and security. Often used on servers and in embedded systems (e.g., ATMs).

Android:* The most popular OS for smartphones and tablets globally and in South Africa. iOS:* The OS for Apple iPhones and iPads.

Device Drivers:* These are small programs that allow the OS to communicate with specific hardware devices, such as printers and scanners.

Application Software: This type of software performs specific tasks for the user.

Examples include: Word Processors:* For creating and editing documents (e.g., Microsoft Word, Google Docs). Think of typing your school assignments.

Spreadsheet Software:* For organizing and analyzing data (e.g., Microsoft Excel, Google Sheets). Think of tracking your family budget.

Presentation Software:* For creating slideshows (e.g., Microsoft PowerPoint, Google Slides). Think of presenting your school project.

Web Browsers:* For accessing the internet (e.g., Google Chrome, Mozilla Firefox). Think of searching for information online.

Games:* For entertainment (e.g., Candy Crush, Fortnite).

Accounting Software:* For managing finances (e.g., Pastel, Sage). Used by businesses to manage their finances.

Graphics Editing Software:* For creating and editing images (e.g., Adobe Photoshop, GIMP). 2.3 Computer Networks A computer network is a group of two or more computers that are connected together to share resources, such as files, printers, and internet access.