Lesson Notes By Weeks and Term v5 - Grade 10

Lesson Video

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Performance objectives

• Identify key internal and external hardware components.
• Differentiate between system and application software.
• Explain the role of an Operating System.
• Identify different input and output devices.
• Describe primary and secondary storage.

Lesson summary

This week, we continue our exploration of Computer Applications Technology (CAT) by focusing on the fundamental concepts of hardware and software. Understanding these concepts is crucial in today’s world, especially in South Africa, where technology plays an increasingly important role in education, business, and everyday life. From accessing online learning resources to participating in the digital economy, a solid grasp of hardware and software is essential for success.

Think about it: even applying for an ID online or accessing government services requires this basic knowledge.

Lesson notes

2.1 Hardware: The Physical Components Hardware refers to the physical components of a computer system that you can touch and see. It's like the skeleton and organs of a human body. Without hardware, software cannot function. 2.1.1 Internal Hardware: These components reside inside the computer case (also called the system unit).

CPU (Central Processing Unit): Often referred to as the "brain" of the computer, the CPU executes instructions. It performs calculations, manages data flow, and controls other components. Think of it as the principal of a school, managing all the operations.

RAM (Random Access Memory): This is temporary memory used by the CPU to store data and instructions that are actively being used. It’s fast but volatile – meaning data is lost when the power is turned off. Imagine it as your desk where you keep the books you are currently studying.

Motherboard: The main circuit board that connects all the other components. It provides pathways for communication between them. It is like a central hub connecting all departments in a company. Hard Disk Drive (HDD) or Solid State Drive (SSD): These are permanent storage devices used to store the operating system, applications, and data. HDDs use spinning platters, while SSDs use flash memory. SSDs are faster and more durable but often more expensive. This is your filing cabinet where you store all your important documents.

Graphics Card (GPU): Handles the processing of images and videos displayed on the monitor. It is especially important for gaming and other graphics-intensive applications. Imagine a specialist artist creating visual outputs.

Power Supply Unit (PSU): Provides power to all the other components in the system. It converts AC power from the wall outlet to DC power that the computer can use. Like a electricity generator powering all the appliances. 2.1.2 External Hardware: These components are connected to the computer from the outside.

Monitor: Displays visual output.

Keyboard: Used for inputting text and commands.

Mouse: Used for navigating the graphical user interface (GUI).

Printer: Produces hard copies of documents and images.

Speakers/Headphones: Output audio.

USB Flash Drive: Portable storage device for transferring files.

External Hard Drive: Portable storage for backing up or expanding storage capacity. 2.2 Software: The Instructions Software refers to the set of instructions that tell the hardware what to do. It's like the thoughts and actions of a human being. 2.2.1 System Software: This type of software manages the hardware and provides a platform for application software to run.

Operating System (OS): The most important system software. It manages the computer's resources, such as the CPU, memory, and storage. Examples include Windows, macOS, and Linux. Android and iOS are examples of operating systems for mobile devices. The OS is the manager that handles all resources of the computer.

Utility Programs: These programs perform specific tasks to maintain the computer's performance, such as antivirus software, disk defragmenters, and file compression tools. Think of these as tools that help keep the system running smoothly.

Device Drivers: Software that allows the operating system to communicate with specific hardware devices, such as printers and scanners. 2.2.2 Application Software: This type of software is designed to perform specific tasks for the user.

Word Processors: Used for creating and editing documents (e.g., Microsoft Word, LibreOffice Writer). Imagine typing a school report.

Spreadsheets: Used for organizing and analyzing data (e.g., Microsoft Excel, Google Sheets). Think of calculating your budget.

Presentation Software: Used for creating and delivering presentations (e.g., Microsoft PowerPoint, Google Slides). Making a presentation about a South African historical figure.

Web Browsers: Used for accessing the internet (e.g., Google Chrome, Mozilla Firefox).

Gaming Software: Used for entertainment (e.g., various PC and console games). 2.3 Input and Output Devices Input Devices: Allow users to enter data and instructions into the computer (e.g., keyboard, mouse, scanner, microphone, webcam).

Example: Using a scanner at the library to scan a document.

Output Devices: Display or produce the results of processing (e.g., monitor, printer, speakers).

Example: Printing out your CV to apply for a job. 2.4 Storage Devices Primary Storage (Main Memory): RAM is the primary storage, providing fast but temporary access to data.

Secondary Storage: Provides long-term storage for data and programs (e.g., HDD, SSD, USB flash drive, external hard drive).

Example: Saving your school project on a USB flash drive for safekeeping. Guided Practice (With Solutions)

Question 1: Name three internal hardware components and briefly explain their function.

Solution: CPU: Executes instructions and performs calculations.

RAM: Stores data and instructions that are actively being used by the CPU.