Computer Systems
Hardware
Software
Basic operations of a computer
refers to the physical parts of a computer system
Key Components
Memory allows the computer to store the data it is using and processing(Primary) RAM - Random Access Memory
Motherboard that holds together many components such as the processor and memory
Output Device allows computer to display information to users
Processor - carry out instructions, process data and do calculations
Input Device allow users to enter data into computer
Storage devices are used to store programs and data(Secondary storage)
Mouse
Keyboard
Camera
Speaker
Printer
Display Screen
SD card
SSD(Solid State Drive)
Hard disk
Thumb drive
Application Software Allows users to write documents, create presentation slides, or produce digital drawings.
Operating Systems Provides the user interface, manages the computer's resources and hardware
refers to programs that instructs the computer what to do
Spreadsheet to perform calculation with data and to create charts
Presentation to create presentation slideshows
Programming to create simple programs
Word Processer to create letters, brochures and information sheets
Drawing to create and edit computer drawings
managing the computer's input and output devices
providing users with a user interface to interact with the computer
managing the computer's resources such as CPU, memory and file storage
supporting the running of other software on the computer
Eg Windows, Mac OS, Linux
Graphical user interface (GUI) Four feature GUI
Menus
Pointers
Icon
Windows
Process
Output
Input
The computer accepts data or instructions from a user. Correct input is important to allow computer to provide meaningful output
The computer performs manipulation or calculations on data to give meaningful results
The computer communicates the information to the user
causes of damage
Overheating
Spilling liquids and food
Deleting system files
Knocking or rough handling
Using outdated antivirus software
Plugging devices into wrong slots
Protection against Data loss
Remember to remove or eject external storage devices such as flash drives safely
Do not leave them unattended to prevent theft or lose of device
Save or back up our files regularly
Troubleshooting
Physical device not working Check if connection is secure check if power is on
Software not working Use task manager to stop program
Wireless not working Check if the adapter is switched on and connected to the appropriate network
Wired connection not working Ensure network cable is connected properly to the PC
If all fails Restart the PC Ask a professional for help
Copyright
Permission needed to do the following:
Modifying or adapting your work
Making and distributing copies of your work
Displaying your work publicly
Examples
Check if a piece of work is protected by copyright
Do not download and use software if no license
Dangers of the internet
Viruses and malicious software
Report bullies to an adult
Will collect personal information without permission
Steal/lose data
Install anti-virus/anti-spyware to prevent
Online predators
Using fake identities online
Do not give away personal information to online strangers
Cyberbullying
Bullying on the cyberspace
Report bullies to an adult
Hackers
Gain unauthorized access to computer systems
Use stronger passwords and change them regularly
Data Units
Terabyte TB,1,000 GB
Megabyte 1 MB, 1,000 KB
Gigabyte GB,1,000 MB
Kilobyte KB,1,000 MB
Petabyte 1PB, 1,000 PB
Byte: made up of eight bits
smallest unit of data in a computer
File Compression
freeing up storage space
ease of file transfer, as
only a single compressed file
process of reducing the
size of one or more files
Memory allows the computer to
store the data it is using and processing
(Primary) RAM - Random Access Memory
click to edit
RAM is volatile memory as
it can only store data temporarily
Will disappear once power if off
Read-Only Memory(ROM)
Contains instructions to start the computer
Cache memory
Stores data the computers
uses frequently, faster then RAM
Secondary storage is non-volatile
and permanent storage
Larger capacity and less expensive
Can be internal external