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Types and components of computer systems
By: Reem Hasayenhttp://www.youtube.com/watch?
v=N2vARzvWxwY
Definition of a ComputerA computer is an electronic device used to process data, converting the data into information that is useful to people
What makes a computer powerful?
Speed A computer can do billions of actions per second.
Reliability Failures are usually due to human error, one way or another.Storage A computer can keep huge amounts of data.
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Computers Consist of Four Parts
Hardware
Software
Users
Data
HardwareMechanical devices that make up the computerExternal Hardware
HardwareInternal Hardware
ProcessingThe procedure that transforms raw data into useful information is called processingThe processor and memory perform this transformation
ProcessorThe computer’s brain, which organizes and carries out instructions from either the user or the software
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Circuit board
Motherboard is an example of a circuit board
Attached to the motherboard are many smaller circuit boards that house many internal devices
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Software
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PracticeSoftware :
http://www.teach-ict.com/gcse_new/software/types_software/quiz/matchup_software.htm
Types of computer
http://www.teach-ict.com/gcse_new/computer%20systems/types_computer/quiz/halfmin_types.htm
Input Devices
http://www.teach-ict.com/gcse_new/computer%20systems/input_devices/quiz/matchup_input.htm
Memory ( RAM and ROM)When you launch a program, it is loaded into and run from memory
Random Access Memory (RAM)Determines a computer’s speed and power
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Memory Measurements
Kilobyte (KB)
Megabyte (MB)
Gigabyte (GB)
Terabyte (TB)
Input DevicesAccept data and instructions from the user or from another computer system
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Most Common Input Devices
Keyboard
Mouse
Output DevicesReturn processed data to the user or to another computer system
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Most Common Output Devices
Monitor
Printer
StorageHolds data permanently
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Storage Terms
Magnetic disk
Disk drive
Hard disk or hard drive
Diskettes or floppy disks
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Storage Terms Continued
CD-ROM drive
Compact disks (CDs)
Compact Disk-Read-Only Memory (CD-ROM)
CD-Recordable (CD-R)
CD-ReWritable (CD-RW)
Digital Video Disk (DVD)
SoftwareA set of electronic instructions consisting of complex codes, or programs, that make the computer perform tasks
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Examples of Software
System software
Application software
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Five Computer Categories
Supercomputers
Mainframe computers
Minicomputers
Workstations
Microcomputers, or personal computers