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Summary - Computer Application Technology
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,CAT notes: Grade 12
Term 1:
Module 1.1: Computers in our everyday lives
Why do we use computers:
For Efficiency: save large amounts of space
For Accuracy: Use high quality software and data.
For Reliability: Computers are always accurate and doesn’t need
medical aid nor affected by conditions/emotions.
For Communication: A combination of all the factors to enable
people to: Virtually eliminate time and distances, share info globally
and save on communication costs.
Comparing
computers:
Procession power: Speed of CPU, amount of RAM, additional
graphics/ audio
Uses: Personal use, media processing use and office use.
Physical size: Influences mobility & space required for effective use.
Software: Determines what software can be used.
Non-portable computers: Consists of a system unit, monitor, mouse
and keyboard. Potentially much more powerful than mobile
computers.
Portable computers: Combines system hardware, display devices
and input devices into one mobile unit examples are laptops,
smartphones etc. Has lower levels of processing power and storage
space than non-portable computer.
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Categories for users:
1.) Mobile users: Useable at any place. Large percentage is being
used. Requires: portable device, regular access to internet via
cellular data/ Wi-Fi connection.
2.) Personal users: Limits office tasks, internet banking, email and
browsing the web.
3.) Small Office Home Office (SOHO): Either used for entry-level
unless media editing/ large amounts of data needs to be processed.
Admin tasks like accounting or billing, databases with clients,
suppliers and even electronic document archiving and more.
4.) Super/power Users: Requires the most powerful computers
and best processing capabilities like: Competitive gamers,
architects/ 3D rendering artists, engineers and more.
Convergence:
Is the trend of separate technologies and functions of different
devices are combined as one. Examples are smartphones and
tablets.
Components that affect computer
performance:
CPU: Multiprocessing is having multiple CPU's (cores) on a single
CPU chip. Improves performance.
RAM: Is the main memory. Stores the used programs and their
data. Double Data Rate (DDR) or SDRAM is used the most.
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, Graphics card: Consists of a GPU (Graphic Processing Unit) that
processes images stored in graphics card/VRAM that frees up
the CPU to perform other tasks. GPU is embedded into the CPU
instead of VRAM and shares the system.
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