Introduction to Computers

Input

  • Process of entering data and instructions into a computer.

  • Common input devices:

    • Keyboard: used for typing commands and text.

    • Mouse: facilitates graphical user interface interaction; right-click for menus, scroll for navigation.

    • Scanners: digitize documents for computer use.

    • Microphones: capture audio input.

Output

  • Results of computer processing.

  • Common output devices:

    • Monitor: typically LCD/LED, used for visual display.

    • Printer: produces hard copies; types include:

    • Inkjet: best for photos and color.

    • Laser: best for text and speed.

    • 3D Printers: create three-dimensional objects.

    • Speakers: provide audio output.

Storage

  • Types:

    • Main Storage:

    • Hard Drives (HDD): for large-volume data storage.

    • Solid-State Drives (SSD): for faster access to data.

    • Portable Storage:

    • USB drives, memory cards, external hard drives for easy file transfer.

    • Cloud Storage: allows remote access and sharing over the internet.

  • Storage unit conversion:

    • 1 KB = 1000 bytes

    • 1 MB = 1000 KB

    • 1 GB = 1000 MB

    • 1 TB = 1000 GB

Health and Ergonomics

  • RSI (Repetitive Strain Injury): Injuries from repetitive actions like typing; prevention via ergonomic equipment (such as adjustable chairs and keyboards) and practices (wrist rests, proper posture).

  • Health tips:

    • Adjust seating height.

    • Ensure proper monitor positioning at eye level.

    • Take regular breaks (recommended every hour) to stretch and rest eyes.

Green Computing

  • Focus on environmentally sensitive computer usage, promoting sustainability in technology.

  • E-waste: Disposal of toxic electronic materials that can harm the ecosystem; includes recycling programs and donation options to minimize landfill impact.

  • Tips for green computing:

    • Power conservation by using energy-efficient settings.

    • Minimize paper usage through digital documentation.

    • Use eco-friendly disposal methods such as recycling programs.

ICT Systems

  • Multi-purpose devices (desktops, laptops, smartphones) operate various applications for tasks like word processing, browsing, and gaming.

  • Servers: provide resources and network services; designed for handling more load and serving multiple users simultaneously.

  • Ethical computing: entails practicing honest and fair usage of technology, and avoiding harm to others and the environment through responsible digital behavior.


  • Monitor: typically LCD/LED, used for visual display.