Types and components of computer systems By: Reem Hasayen zvWxwY.

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