CAT study notes

GRADE 10 TOPIC OUTLINE FOR TERM 1 TEST PAPER 2

BY SIRANTWI
50 marks
System Technologies-50 marks

Main Topic

Definition of a Computer

  • A computer is an electronic device that processes data to produce information.

Types of Computing Devices

  • Desktop Computers

    • Stationary, good performance, used in offices or homes.

  • Laptop Computers

    • Portable, battery-powered, suitable for mobile use.

  • Tablets / iPads

    • Touchscreen devices, portable, used for multimedia, browsing, light productivity.

  • Smartphones

    • Handheld devices combining phone and computing functions, used for communication, apps, internet.

  • Servers

    • Powerful computers providing resources/services over a network.

  • Mainframes

    • High-capacity, large-scale computers for critical enterprise applications.

  • Supercomputers

    • Extremely fast computers for scientific calculations, simulations, and AI.

  • Embedded/Dedicated Devices

    • Single-purpose systems built into other devices, e.g., ATM, smart fridge.

  • Wearable Devices

    • Computers worn on the body; track data, health, or notifications (smartwatch, fitness tracker).

  • Thin Clients

    • Minimal hardware, rely on network/server resources for processing.

Hardware vs Software

Hardware

  • Hardware: Physical parts of a computer can be touched such as input, output, processing, and storage devices.

    • Example: Keyboard, monitor, CPU, hard drive.

  • Components of Computer System

    • Input Devices: Mouse, keyboard, scanner.

    • Output Devices: Monitor, printer, speakers.

    • Processing Devices: CPU (brain of computer), RAM, Motherboard.

    • Storage Devices: HDD, SSD, USB.

Software

  • Software: Set of instructions controlling hardware.

    • Example:

    • USB: Connects storage devices, printers, etc.

    • HDMI: Transmits high-quality audio and video.

    • Network port (Ethernet): Connects computer to a LAN.

Processing Devices

  • CPU: Processes data.

  • RAM: Holds temporary memory.

  • HDD/SSD: Stores data permanently.

  • GPU: Graphics Processing Unit.

  • Key operations are classified as input, processing, output, storage, and communication devices.

Ports and Connectors

Converter vs Adapter

  • Converter: Changes signal type (e.g., digital to analog, HDMI to VGA).

  • Adapter: Allows one plug type to fit another without changing the signal (e.g., USB-C to USB-A).

  • Basic/Essential Hardware Components: CPU, RAM, Storage (HDD/SSD), Motherboard.

Input Devices

  • Devices used to capture data (e.g., mouse, scanner, webcam, mic, fingerprint reader, keyboard, stylus, touchscreen).

Pointing Devices

  • Touchpad: Laptop cursor control.

  • Trackball: Ball-controlled pointer useful for limited space.

  • Touch Screen (Single/Multi-Touch): Interacts directly with screen.

  • Stylus: Pen-like input for drawing/writing.

  • Joystick: Used for gaming and controlling simulations.

Scanning & Reading Devices

  • Convert physical data to digital.

    • Types of Scanners: Multifunction, handheld, flatbed, sheetfed.

    • RFID: Reads wireless electronic tags.

    • Magnetic Strip Reader: Reads bank card strips.

    • Barcode Reader: Reads product barcodes.

    • QR Code Reader: Scans quick-response codes for digital links to webpage/email.

    • OCR: Converts scanned document to editable digital text.

Output Devices

  • Output is the processed information produced by a computer.

  • Types of Outputs:

    • Text: Reports, documents.

    • Graphics: Images, charts.

    • Audio: Music, voice.

    • Video: Clips, animations.

  • Output Devices: Hardware used to display or produce information from a computer.

    • Examples: Monitor, printer, speakers, projectors.

    • Hard Copy: Physical output on paper (e.g., printout).

    • Soft Copy: Digital output on a screen (e.g., PDF, display).

Advantages/Disadvantages of Output Devices

  • Advantages:

    • Easy sharing of information, visual clarity, physical records (printouts).

  • Disadvantages:

    • Ink and paper costs, maintenance, power use, limited portability.

Audio Output

  • Speakers, headsets play sound.

Other Output Devices

  • Multifunction Device (MFD): Print, scan, copy.

  • Data Projector: Displays large images.

  • Visualizer: Projects physical documents onto a screen.

Types of Storage

  • Primary: Temporary (RAM), volatile, expensive per GB, faster access.

  • Secondary: Long-term (HDD/SSD), non-volatile, cheaper per GB, slow access.

  • Storage Options:

    • HDD (magnetic), SSD (electronic), flash drive (electronic), CD/DVD (optical), memory card (electronic).

    • SSDs are faster read/write compared to HDDs but more expensive per GB.

    • Cloud Storage: Saving data online; access to files anywhere/any device with internet (e.g., Google Drive, OneDrive).

    • Memory Cards: Small, portable storage for phones/cameras; vary in size & speed.

    • Card Readers: Built-in or external devices to read memory cards.

Information and Communication Technology (ICT)

  • Definition: ICT refers to the use of computers, electronic devices, and networks to collect, process, store, retrieve, and communicate information.

  • Key Components:

    • Information: Data that has been processed into meaningful form.

    • Communication: The transmission of information from one place to another.

    • Technology: The tools and systems used to perform these tasks.

  • ICT includes devices such as computers, smartphones, the internet, ATMs, and point-of-sale systems.

  • Basic Model of ICT Systems

    • Input: Convey data.

    • Processing: Manipulate data.

    • Storage: Store data.

    • Output: Communicate information.

Examples of ICT Systems

Point of Sale (POS) System

  • Input: Barcode scanner reads product codes.

  • Processing: System calculates total cost including VAT.

  • Storage: Sales data saved in store database.

  • Output: Receipt printed for the customer.

Cell Phone

  • Input: User types a message.

  • Processing: Phone converts text into digital signals.

  • Storage: Messages saved in memory.

  • Output: Message displayed or sent to another user.

Types of Computing Devices

Dedicated Devices

  • Examples: ATMs, electronic appliances.

Mobile Computers and Devices

  • Examples: Smartphones, tablets, laptops.

Client/Server Systems

  • Client: Device requesting resources or services (e.g., a user's PC).

  • Server: Powerful computer providing resources or services to clients (e.g., file, web, or mail server).

Concepts of Data and Information

Data

  • Definition: Raw, unprocessed facts or figures with no meaning.

    • Example: A list of CAT learners' marks (e.g., 45, 60, 78).

  • Provides the foundation for creating information.

    • Data example at school: Marks from tests, attendance records, learner names.

Information

  • Definition: Processed data that has meaning and can be used for decision-making.

    • Example: The class average mark is 61%.

  • Information examples: Class averages, attendance reports, top achievers.

  • Importance: Aids in decision-making, planning, and problem-solving in an organisation.

  • Note: Data becomes information after it is analysed, summarised, or organised.

Authentication

  • Definition: The process of verifying a user's identity before granting access to a computer or system.

  • Purpose: Used to confirm user identity and protect data from unauthorized access.

  • Example: Logging in with a username and password.

    • Create strong passwords and do not share them with others.

    • Recommendations:

    • 8 or more characters

    • Mix upper and lower case.

Economic Reasons for Using Computers

  1. Increased Productivity

  2. Reduced Labour Costs

  3. Improved Accuracy

  4. Better Data Management

  5. Cost Savings on Paper

  6. Faster Communication

  7. 24/7 Operation

  8. Improved Customer Service

  9. Access to Global Markets

  10. Competitive Advantage

Solutions Development

Overview

  • Microsoft Word is used to create documents such as letters, articles, homework, assignments, etc.

File Management

  • Save: Save documents with good naming and folder organization.

  • Save As: Save a copy under new name, location, or format (e.g., .pdf, .txt).

Selecting Data

  • Use mouse drag or + to select all content.

  • Cut (+X), Copy (+C), Paste (+V), Find (+F), Replace.

Page Layout (Layout Tab)

  • Margins, orientation (portrait/landscape), paper size, columns, hyphenation settings.

  • Page numbers: header/footer options and styles.

  • Page breaks: Start new pages.

  • Section breaks: Format sections differently.

  • Headers and footers: Page info, graphics, fields.

  • Fields: Auto-update data like date, filename.

  • Cover page: Document title, author, summary, images.

Insert & Manipulate Objects

  • Images: Resize, format, clip art, word art (text effects), shapes (with text), charts (link from Excel), smart art (organizational charts, diagrams), text boxes.

Paragraph Formatting

  • Line spacing, paragraph spacing, indents (left, right, first line, hanging), alignment (left, center, right, justified), borders, and shading.

Styles

  • Consistent formatting using quick styles, style sets, and custom styles for efficient document formatting and navigation.