Lesson Notes By Weeks and Term v5 - Grade 10
Systems technologies: computer components and operating systems – Week 7 focus
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Systems technologies: computer components and operating systems – Week 7 focus
Download the Lessonotes Mobile South Africa app for faster lesson access on Android and iPhone.
Subject: Computer Applications Technology
Class: Grade 10
Term: 1st Term
Week: 7
Theme: General lesson support
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This week, we delve into the heart of computer systems: the physical components (hardware) and the software that makes it all work together (operating systems). Understanding these systems is crucial in today's digital world. From using cellphones for mobile banking in townships to accessing online educational resources in rural areas, computer systems are integral to modern South African life. Knowing how they function allows you to make informed decisions about technology, troubleshoot problems, and even pursue careers in the ICT sector, which is experiencing significant growth in our country.
2.1 Computer Components (Hardware) The computer case houses a variety of essential components, each with a specific role.
Let's explore these: CPU (Central Processing Unit): This is the "brain" of the computer. It executes instructions from programs. Think of it as the engine of a car; the faster the engine (CPU speed, measured in GHz), the quicker the car (computer) can perform tasks. CPUs have cores, and more cores generally mean better performance when multitasking (running multiple applications simultaneously).
Examples: Intel Core i5, AMD Ryzen
5. In South Africa, the availability of CPUs is generally widespread, but the specific models available and their cost can vary based on location and retailer.
RAM (Random Access Memory): This is temporary storage that the CPU uses to quickly access data while a program is running. Imagine it as the desk where a student keeps the books and notes they are currently working with. The more RAM you have (measured in GB), the more programs you can run smoothly at the same time. RAM is volatile, meaning data is lost when the computer is turned off.
Examples: DDR4, DDR
5. Often, due to load shedding, it is useful to have battery powered back-up to prevent data loss and potentially corrupting the RA
M. Hard Drive (HDD) / Solid State Drive (SSD): This is permanent storage where the operating system, applications, and your files are stored. HDDs use spinning platters to store data, while SSDs use flash memory (similar to a USB drive), making them much faster. HDDs are cheaper for the same storage capacity, but SSDs offer a significant performance boost. Think of an HDD as a large filing cabinet with lots of drawers, and an SSD as a digital file server with instant access.
Examples: Seagate Barracuda (HDD), Samsung 970 EVO (SSD).
Motherboard: This is the main circuit board that connects all the other components together. It provides the pathways for communication between the CPU, RAM, hard drive, and other devices. Think of it as the city’s road network, connecting all the different parts of the city.
GPU (Graphics Processing Unit): This handles the processing of images and videos. It's crucial for gaming, video editing, and other graphically intensive tasks. Some CPUs have integrated GPUs, while others require a dedicated graphics card.
Examples: NVIDIA GeForce RTX 3060, AMD Radeon RX
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0. Given the reliance on social media, a good GPU is crucial to display the images that are transmitted.
Power Supply Unit (PSU): This supplies power to all the components in the computer. It converts AC power from the wall outlet to DC power that the components can use.
Example 1: You are building a computer for a small business in Soweto that will primarily be used for accounting and word processing. What components are most important to prioritize and why?
Solution: For this scenario, the CPU, RAM, and SSD are the most important. A decent CPU (like an Intel Core i3 or Ryzen 3) will provide sufficient processing power for these tasks. Prioritize 8GB or 16GB of RAM for smooth multitasking, and an SSD (at least 256GB) for fast boot times and application loading. A dedicated GPU is not necessary, as the integrated graphics of the CPU will suffice. 2.2 Operating Systems (System Software) An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs. It acts as an intermediary between the user and the hardware. It's the foundation upon which all other software runs. Examples include Windows, macOS, and Linux.
Functions of an Operating System: Memory Management: Allocates and manages RAM for different programs. Prevents programs from interfering with each other's memory.
Process Management: Manages the execution of programs (processes). Schedules processes to run on the CP
U. File Management: Organizes files and directories on the storage devices (HDD/SSD). Provides a user interface for accessing and manipulating files.
Device Management: Communicates with hardware devices (printers, keyboards, mice, etc.) through device drivers.
User Interface: Provides a way for users to interact with the computer (e.g., graphical user interface (GUI) or command-line interface (CLI)).
Types of Operating Systems: Windows: The most popular desktop O
S. Known for its wide software compatibility and user-friendly interface. A paid OS. macOS: Apple's OS for its Macintosh computers. Known for its elegant design, security, and integration with Apple's ecosystem. A paid O
S. Linux: An open-source OS that is highly customizable and versatile. Available in many different distributions (e.g., Ubuntu, Fedora, Debian). Often used on servers and embedded systems. Typically free to use, with paid support options available.
Device Drivers: These are software programs that enable the operating system to communicate with specific hardware devices. Without the correct driver, a device will not function properly.