Class notes

One-Page Summary of CAT Theory

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Course
Computer Literacy

Institution
12th Grade

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Uploaded on January 17, 2025
Number of pages 5
Written in 2024/2025
Type Class notes
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cat notes

Institution 12th Grade
Course Computer Literacy
Schooljaar 201

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lOMoARcPSD|18993199

CAT theroy One page - CAT theory One page

Compute Applications Technology (UCT Online High School)

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, lOMoARcPSD|18993199

ations less l and
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Term 1 Theory *Wired
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*The
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1. Why do we use computers? quality
Tro 'Sticky' 'Sticky' * Errors *Unresp *U
EfÏciency computers save-Time; Labor; Resources keys: keys: in onsive: n
sh clean clean image check if n
Accuracy - ensured by quality programs and quality data-mass production on assembly with with size or plugged p
o damp damp quality: in in
cloth/sm cloth/sm check properly, p
lines-preforming tasks over and over again with 100% accuracy. all brush all brush settings
of the
switched
on,
w
se
Wireles Wireles
Reliability-Computers can be relied on to do tasks-that require accuracy-without tiring- s s scanning select as a
keyboar keyboar software current d
d not d not * Non- came to b
without getting bored, etc. respond
ing
respond
ing
respons
ive
be used
by the
yo
te
Communication-saves communication costs-virtually eliminates time and distance- batteries batteries scanner software is
/dongle/p /dongle/p : see if: *Restart fu
ort ort plugged the n
communicate and share info in many different ways globally-interact socially on a global Wired
keyboar
Wired
keyboar
in,
connecte
software
that is
p
scale. d not d not d, and using the
respond respond unlocked webcam
ing ing *Skew
2. What are the things that must be considered when buying a computer? disconne disconne docume
ct and ct and nt:
Should the computer be mobile? - What are the hardware requirements of the software you reconnec reconnec paper
t t not
aligned
want to use? - What are the specifications of an entry-level and a more advanced computer?
5. Look at the table below (OUTPUT DEVICES)
-Does the computer come with an operating system?
Monitor/Display Speaker/ Printer Data projector
3. What are the different computer systems? Headphones
Non-portable computers- they Have a system unit which is usually built in, monitor, Use * Displays the *Play sound *Laser- black and * view the
data & programs *Listen to voice white or colour projected image
mouse and keyboard- They are large in size, not meant to be moved, used remotely- More on your com messages *Inkjet- black and
*Interactive white or colour
powerful than mobile and portable computers. feedback *Dot-Matric-Point
of sale
*3D-Print 3D
Entry-level computers- these computers are cheaper to buy in range- They have lower Adv * Interact with a *Head-listen to *Laser-Speed, * project a
computer sound without High text quality presentation,
hardware specifications- Come with ‘home editions’ of software. * Easily change disruption *Inkjet-Cheaper, movie or image
the displayed *Head-listen t best quality for a large group
Portable computers- All in one design includes screen, keyboard and pointing devices- content sound Mobily photo printer of people
*Easily change *Speak-group can *Dot-Matric-
They have folding capabilities to save space- they are easy to carry. (e.g. Laptop/Notebook, the display to listen to sound at cheap, low
your liking same time running cost
*3D-print tools u
tablet, smartphone etc.) need, print
prototypes
4. State the different categories of computer users? Lim *Display quality * Sound quality * Laser- paper * Resolution not
depends on size depends on them does not absorb good as HQ
Personal users- limited ofÏce tasks, used for basic tasks for a single user- internet *Large mons is * Additional audio the ink, Average monitor
hard to move equipment to color photos. * Brightness of an
banking- emailing and browsing the web- to skype and communicate with family- for enhance sound. *Inkjet-Higher image not good
*When loud running cost, as HQ monitor
=annoying slower * contrast ratio is
entertainment. *Dot-matric-Low lower than a
printing, not for normal monitor
SOHO users (small ofÏce home ofÏce)- can be used for small business or personal high quality
*3D-expensive,
network at home- used for: Accounting or billing, database for clients etc., electronic slow, smelly and
loud
document archiving. By facs *The resolution *The sound *Speed
* The screen quality *Resolution
size * Has more than * Type of paper
Power users- Use faster and more expensive computers- More RAM, Faster processor, * The refresh one audio and size
rate input/Bluetooth * Wireless
more memory space- Higher specifications for software that use more resources (e.g. *Has volume
control
capabilities
*Cost of paper
Hardcore gamers, Architects, Engineers, Scientists, Video editors) Tro shot *Black screen:
plugged in,
* No sound-not
plugged in
*High-resolution
Image-Select
*Similar to
monitor
Mobile users- Want and need to have their technology with them wherever they are- used switched on, properly, might standard mode to *Bulb might be
cable put be muted, use speed up printing blown
properly, test the wrong output *Printer software-
for browsing the internet and emailing, playing games and reading books, note taking and with other mon device Update
*Image issues: *Paper jam-
taking photos/videos etc. adjust brightness remove paper
*Tinted image: *Bad printing q-
5. What is convergence? check for faulty check ink/toner
connection or lever and paper
damaged cable type
The trend where separate technologies and functions that previously required different *Large images *Not printing-
good connection,
devices are combined into a single device e.g. smartphones, tablets. check ink
6. Things to consider when comparing computers? 6. Look at the table below (STROAGE DEVICES)
How powerful they are referring to the speed of a computer's CPU and how much RAM is Internal Hard External hard Solid-state Flash Optical Cloud
drive drive drive drive disc
installed. -What they are used for causing some computers are used for basic tasks, while drives
others are used for servers in a network. - Their size of computers can be anything- The Use *Store data *Store and carry * SSD * Small * Read * storage
media, data with functions portable data service
u more like storage from a that
software they use which depends on the operating system of computer *Backup a CPU, device compact allows
Like a * Transfer disc (CD), you to
1. Explain the information processing cycle? (HARDWARE) hard drive data digital store
* Contains between optical informati
Input- data is entered into a computer and collected- This can be done through \ input billions of computer disc on on the
small s (DVD), Internet
devices like keyboards, mice, scanners, and microphones transmitte Blu-ray
rs that disc (BD)
store bits
Processing- The brain of the computer CPU central processing unit which transforms raw of data
data to meaningful information, uses the binary code to do this. (CPU, RAM)
Adv * Large storage *Larger capacity *Faster *Compac *Less *Access
Output- Computer takes the data from the processing stage and presents it in a way that space *Save data faster than t& expensiv anywhere
*Save data faster than CD normal portable e than *Info
the reader can see it- Output devices like monitors, printers, and speakers than CD *Easy to transfer hard drive *Durable HD can’t be
*Easy to replace a data *Uses less than *Can be lost
damaged drive *Backup power other repeatedl *No
Storage- Saving data from input and information for future use. (SSD, Flash drive, Hard than HDD storage y used additiona
*Not noisy devices storage
drive, Optical media) *More *No devices
durable power needed to
Communication- transfer of data and information between computers or devices- this can needed store data
Lim * Prone to wear * Prone to wear *Expensiv *Easy to * Data *love
occur across multiple networks- Communication technologies like the internet, Bluetooth, and tear and tear e lose transfer control of
*Easily damaged *Easily damaged *Limited *Short is slower privacy &
*Lose data when *Lose data when space life span *Easily security
and Wi-Fi. damaged damaged *Shorted *Expensi damage *Needs
*Slower than life span ve per or lose a internet
2. What is the difference between data and information? internal gigabyte disc connectio
n
Data is raw and processed that need to be processed and can’t be used as is, can we in the *
Tro *Full storage *Full storage *Dirty-
form of the numbers text images audios or video. Information is when data is processed space-delete space-delete Clean
sho unnecessary files, unnecessary files, with a
use use soft
organized, structured, making it useful. t external/cloud external/cloud damp
storage, add storage, add cloth.
3. How do computers turn data into information? another another *Scratch
*Slow/ *Slow/ ed or
Computers take data and process it into information. unresponsive- unresponsive- damaged
Defrag your hard Defrag your hard -Replace
4. Look at the table below (INPUT DEVICES) drive drive the disc;
*Corrupted files- *Corrupted files- fixing is
Error-check files Error-check files difÏcult.
Keyboar Mouse Touchsc Touchp Scanner Digital Webca Microph via Properties > via Properties >
d reen ad camera m one Tools > Check Tools > Check
7. What to think about when making decisions about storage?
What size hard drive do you need, an entry-level or? -Do you need an optical drive? -
Us *Type in *Interact *It * * * *Record
text(data with replaces Replaces Captures Capturin sound Do you need to write optical disks? -Do you need an SSD?
e ) graphic the mouse images g images *Commu
*Give elements mouse and from * nicate
comman on GUI and devices paper Capturin *Digital 8. Look at he table below (COMUNICATION DEVICES)
ds (short *Click, keyboard such as sources g videos camera
cuts & double- *You can laptop * that is Cellular modem ADSL and fibre router
function click, easily Reading connecte
keys right- navigate barcodes d to your
click, and use compute
scroll, many *Creatin Use *Access the internet wherever * Asymmetric Digital Subscriber
drag functions g and there is cell reception Line (ADSL), for internet
uploadin *Creates a Wi-Fi network for connection
g videos. multiple devices to access the *Fiber router-or fibre internet
* Internet connection
Remote- *Easy to install and use * You can make phone calls and
controlle adv *Portable be connected to the Internet
d *Connects to any computer with an ADSL router
security *Uses 4G/5G network, fast and * Connect multiple devices to an
cameras. reliable ADSL and fibre router
Lim *Easy to loss or get stolen *ADSL- need a landline
*Slower data rate *Fibre-physical cable connection
*Limited monthly or daily usage to an existing fibre network
*Fastest *Easy-to- *Can be * No * Store * You can *Cheap *Record *ADSL- cable theft is a problem
Ad way to learn used as extra images upload and verbal because of copper content
v enter *Effectiv a devices and photos to small communi
text e way to keyboard needed documen your * Have cation 9. What factors to think hen buying a storage device
*Easy to interact and a such as ts and computer face-to- *Give
learn and with GUI mouse muscles print . face voice storage capacity, storage speed, volatility - will the device lose data when turned off,
use *Easy to * Extra them * You can conversa comman
use, space or later. store tions ds
requires a flat * You can hundreds without *Use reliability and durability - how likely will the device break down.
little surface edit of digital travelling software
training for a documen images. . to edit or 10. Briefly discuss the CPU
*Intuitive mouse. ts with * You can manipula
interacti OCR easily te sound
ons. * preview The CPU or processor is responsible for running programs and processing data, speed is
Physical the
documen photo measured in Gigahertz (GHz), personal users, SOHO users and mobile users would need a
ts can be you took
easily and
converte delete standard entry-level processor
d. any ones
you do 11. Briefly discuss the RAM
not like.
Li *Cannot * Flat *You can * Harder * Quality *Photos * Low *Built-in Random Access Memory is temporary storage area for programs and data being processed
be used surface damage to of scant are easy resolutio micropho
m with a and and dirty control image to lose n and ne
GUI
interface
enough
space
the
screen.
the
pointer
depends
on
along
with
create
poor-
doesn’t
provide
Also known as DIMMS/DDR3/DDR4, RAM is used for any user, but power users would requir
. around *Screen than a quality of device quality high more memory.
* Takes the display mouse. original *Quality videos. quality
up space compute area is * DifÏcult doc/imag of photos *To work sound
* Can be
difÏcult
r to use. reduced to use if
you have
e depends
on the
it
webcam
*DifÏcult
to use in
12. Briefly discuss the Hard Disk Drive
*Uneven *Any dirt
to use surface a hand can quality of needs to noisy HDD is the main, permanent storage are for all your data and software, A file server in a
for some can or wrist affect camera be environm
people cause injury. the connecte ents
disruptio * Cannot image of d to a network often has a few hard drives, other names are RPM.
ns. be your computer
repositio digital . 13. Look at the table below(DEVIVES FOE DISABLED USERS)
ned. documen
t.
*Height *Ergono *The Visually impaired/Blind Hearing impaired/Deaf Motor control
By of the mic resolutio •Braille display • Devices that vibrate instead of • Eye movement tracking
fac keyboard consider n of the • Magnification devices emitting sound devices
*Ergono ations camera • Large-key keyboards • Head movement tracking
s mic *Wired *The • Braille printers devices
consider or wire horizonta
Downloaded by Kundai Saira () • Large key (outsized)

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