Class notes
Class notes Computer Literacy
- Course
- Computer Literacy
- Institution
- 12
General Notes to help you with your CAT journey throughout Matric.
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Types of Portable Hardrives- internal storage device
- store data permanently
- free up disk space, thus have more RAM
- 2.5” hard drives are found in laptops, don’t need external power [power through USB port]
- 3.5” hard drives found in desktops, need external power [plug into wall socket]
Upgrading Computers
▫ hardware
- need to be upgraded before hardware becomes obsolete
- can upgrade RAM, Hard Drive, CPU, Monitor
- if motherboard is upgraded then the whole system unit needs to be upgraded [HHD/SSD]
▫ software
- software updates improve increased security, advanced services and latest ideas
Safe Mode Booting
- F8 key
- safe mode is a startup mode in Windows operating systems that's used as a way to gain limited access
to Windows when the operating system won't start normally
- when experiencing problems, put into safe mode
Operators of databases
- boolean operators [and/or/not] limit search to find data necessary
- IS NULL → no data in a specific field
Units of Measurements
- 1Tb =1024Gb
- 1Gb = 1024Mb
- 1Mb = 1024b
- Ghz =power of a CPU
Internet of Things
- The internet of things (IoT) is a computing concept that describes the idea of everyday physical objects
being connected to the internet and being able to identify themselves to other devices
- can represent itself digitally and become data in a system
, Scanners
- captures physical images and converts them into digital images
- OCR software used
- used for reading barcodes
▫ advantages ▫ disadvantages
- easy to convert text into digital form - quality depends on original document
- faster and more accurate than re-typing - books are difficult to scan
- can preserve old documents - slow and takes up time
- less paper used, promotes green computing - high quality takes up memory
- types of scanners → flatbed scanners; barcode scanner; photo scanners; mobile scanners
Virtual vs Augmented reality
- virtual reality
→ create whole new 3D world for user to experience
→ powerful graphics card; head-mounted needed
- augmented
→ add 3D objects and buttons onto real world view
→ needs motion sensors, camera, screen and controlling input [e.g. Pokémon Go]
Input Devices
keyboard - device used to quickly type in text [use short-cuts make it quick]
mouse - pointing device which is essential to be able to use a graphic user interface
touchscreen - device where you touch where you want to click instead of type
touchpad - pointing device on laptop that replaces mouses
scanner - captures physical text and converts into digital text
digital camera - device that captures images
webcam - camera used for video communication and live feed events
microphone - used to record sound and communicate to others
Trouble shooting hardware/software
▫ hardware
- with a dark screen
▫ software
- task manager
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