An in-depth analysis of all the sections and topics for Computer Application Technology including Networks, Hardware, software, file management, green computing etc. from the start of Grade 11 to the end of Grade 12 which will all be tested in the final matric exam.
CAT THEORY NOTES:
Computers in our everyday life:
Why we use computers:
Efficiency, Accuracy, and Reliability
Efficiency:
Computers save:
Time
Labour
Resources
Accuracy:
Quality
Essential in mass assembly lines
Reliability:
Consistency (no complaints, no tiring)
Communication:
Efficiency, accuracy and reliability of computers are combined with the ability to communicate.
This enables us to:
Eliminate time and distance as constraints.
Communicate and share information globally.
Save on communication costs.
Interact socially on a bigger scale.
Types of computer systems:
When comparing computer systems:
Power
Purpose
Size
Software
Non-Portable Computers:
Consist of:
System unit
Monitor
Mouse
Keyboard
They are often LARGE and Not Portable
,Types:
Desktop computer
Server
Workstations
Portable Computers:
Consist of:
All-in-one design
Fold up = less space + easy to carry
Recently outsold desktops.
Types:
Laptop/Notebook/Tablet PC
Screen size larger than 12" or 13"
Tablet PC: reversible screen, touch/pen sensitive
Ultrabook
Ultra slim + light
Use SSD
Netbook
More popular as lightweight computer
Low powered CPU
No optical drives
Mobile Computing Devices:
Designed to:
Maximise battery life and always connected.
OS use less power.
Touch screen Interfaces
Categories of Users:
Casual or Personal User:
Limited office tasks
Internet banking
E-mail and browsing the web.
Social networking
Skyping
Viewing and sharing photos
Entertainment
Browsing e-mail
Playing games
Reading books
GPS
Note taking.
Photos and videos
Convergence:
Definition:
Separate technologies and functions that required different devices in the past are combined into
one single device.
Hardware:
, Information Processing cycle (IPC):
Input:
Identifying data needed
deciding how to capture data
planning and creating data capture forms and instructions
Process:
Only takes place if software and data is loaded into RAM.
Uses algorithms.
Usually involves: Communication:
Searching Allows for different aspects of IPC to
Sorting connect and talk to each other.
Mathematical calculations
Storage:
Use appropriate media storage.
Security
Good backup policies
Output:
Directly sent to storage
Directly communicated to other computers
Used as input.
Input Devices:
Allows ICT device to receive Data and instructions and is the FIRST STEP in IPC
Keyboard:
Uses:
Typing
Giving commands
Advantages:
Fast
Easy to learn + use.
Disadvantages:
Not designed to be used with GUI.
Takes up desk space.
Need skills.
Buying Factors:
Ergonomics
Wireless VS Cables
Problem Solving:
Sticky keys clean with damp cloth
Wireless keyboard not responding batteries
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