Our Grade 12 Computer Application Technology (C.A.T) noteset is the perfect resource for students who are looking to excel in their NSC exams. With detailed sidenotes and colourful interpretations, students will be able to learn and review the course material with ease. Our notes also includes extr...
, System Technologies & implications
1. COMPUTERS IN OUR EVERYDAY LIVES
WHY DO WE USE COMPUTERS? [PROCESSORS]
EFFICIENCY: Time saving
→ works faster than humans
→ time consuming tasks > bigger scale
Work
→ reduce labour involved > mentally intensive and repetitive physical
tasks
→ perform tasks dangerous for people to perform solely
Resources
→ = cost money = computers programmed to work more
efficiently with resources
→ Technology = used to monitor & limit carbon emissions = air we
breathe cleaner
ACCURACY: → computers have quality programs and quality data = extremely
accurate [Repeatable accuracy = essential in mass production]
→ software is correct & up to date = computer perform the same
tasks over and over with 100% accuracy
aspects ensuring that computers are accurate:
application programs + data = high quality
RELIABILITY: → relied on to do tasks accurately, without getting tired, getting
bored, complaining, or asking for more money [human qualities]
→ help us to record and use data efficiently → allowing users to
work in an organized and competent way = a lot of work done
with little effort
→ Efficient data entry = aided by accurate data entry = aided by
the use of data validation techniques
→ process data reliably = users enter the data accurately]
→ 'garbage in, garbage out' (GIGO) = inaccurate inputs will result in
inaccurate outputs
COMMUNICATION: & virtually eliminate time and distance [business restrictions]
& communicate & share information > different ways worldwide
(ICT = wide range of communication methods)
& save on communication costs = no longer necessary to spend
large sums of money on communication and transfer of
documents etc.
& social interaction on a global scale [Social networking tools]
OLD DAYS: suppliers take longer communication = slower pace of
business transactions
NOW: Global Range + Speed (Computers) = Reduce Time and Distance
1. powerful [POWER CAPACITY] → specifications of the computers [speed of CPUs, and
how much RAM they have installed]
2. Type of usage
3. Their size (mobility) → RANGE from large (mainframe) computers that fill large rooms
to laptops, tablets and smartphones.
4. Software usage → type of operating systems = 'platforms' [computers = 'Linux
machines' or 'Windows machines']
(5.PRICE)
NON- = system unit, screen, mouse and keyboard
PORTABLE [“ALL IN ONE UNIT”]
COMPUTERS = large in size & not intended to be moved
around
= generally more powerful than mobile or
portable computers
= easier to transport and take up less space [more difficult > repair or
upgrade]
→ work / DESKTOP computer = lower specifications cost less
→ server = powerful computer used to provide resources and services
to all the computers connected in a network
Benefits of non-portable computers
1. more powerful than portable
2. "all-in-one" version = easy transport + takes up less space
PORTABLE → = traditional operating system (Windows,
COMPUTERS Linux and macOS)
→ = hardware designed for portability [all-in-
one design]
→ = includes the screen, keyboard, and a
pointing device & a battery so that it can
be used for a limited number of hours
without access to an external power source.
WHAT TYPE OF DESKTOPS COST LESS?
Desktops with lower specifications i.e. :
1) lower processing speed
2) lower RAM
3) lower storage capacity
, A computer that is cheapest to purchase in its range, with low specifications
ENTRY-LEVEL COMPUTER
& cheapest to buy in their range
& fairly low hardware specifications & installed with Home Editions of office suites and
operating systems > fewer features compared to the professional versions of
these programs
& specifications of these systems change over time, so a current top-level computer
system will be considered an entry-level system in a few years
QUIZZZZ!
difference between smartphones / tablets / tablets AND laptops = first three are
designed to be 'always on' and 'always connected' = ALWAYS on and ready to use - only in
a power-saving 'standby' mode.
POS: POINT OF SALE Set of technologies designed to speed up the sales process in a
shop.
USER CATEGORIES
PERSONAL designed to be used by one person at a time for a variety of tasks
USERS (PC’s) [basic input and output devices]
→ limited office tasks
→ Internet Banking
→ Email and Browse the Web
→ social networking
→ to Skype with Family and Friends Overseas
→ to view and share photos
→ for entertainment
SOHO USERS → single office / home office (SOHO)
→ uses a collection of computer devices that are connected to each
other in a small area such as an office or home office
depends on the type of business the user is running = need a common
entry level computer for administrative functions [entry level
computer required = general functions]
& databases with customers, suppliers, inventory, etc.
& Electronic Documentary Filing
& Planning and scheduling, etc.
POWER USERS → faster and more expensive than ordinary personal computers =
higher central processing unit (CPU) speed & permanent storage
→ need computers with higher specifications > applications that
require more resources than normal applications (architects,
photographers and professional players)
→ Make Top-Of-The-Series Hardware Indispensable
→ need high-end specifications
→ use all the advanced features of the software they use
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