what is a computer what is a computer functions of computer functions of computer input device of...
TRANSCRIPT
What is a ComputerFunctions of Computer Input Device of a ComputerOutput Device of a ComputerSystem Unit of a Computer Components of a ComputerStorage of a Computer
Floppy Disc Hard Disc of a Computer Compact Disc of a Computer
Why is a Computer So Powerful?
Contents
What is a Computer A computer is an electronic machine that accepts
data, stores and processes data into information. The computer is able to work because there are instructions in its memory directing it.
The parts of the computer that you can see and touch, such as the keyboard, monitor and the mouse are called hardware. The instructions that direct the computer are called software or computer program.
Data which is raw facts that you the user enter into the computer is called input. This includes; words, numbers, sound and pictures. When the data is entered into the computer, the computer processes the data to produce information which is output. For example, you enter 2+2 into the computer as data, the computer processes it and the result is 4 which is information.
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Functions of Computer
InputProcessOutputStorage
ProcessorControl Unit/Arithmetic
Logic Unit
Memory
Storage Devices
Input Device
s
Output Device
s
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Input Device of a Computer
What is an input device? Hardware used
to enter dataand instructions
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Output Device of a Computer What is an
output device? Hardware that
conveys information to a user
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System Unit of a Computer
What is the system unit? Box-like case
containingelectroniccomponentsused to processdata
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Components of a Computer
What are two main components on the motherboard?
Central Processing Unit (CPU)Also called a processorCarries out instructions that tell computer what to do
MemoryTemporary holding place for data and instructions
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Storage of a Computer
What is storage?Holds data, instructions, and information
for future use
Storage mediaPhysical material on which data, instructions, and information are stored
Storage mediaPhysical material on which data, instructions, and information are stored
Storage deviceRecords and retrieves items to and from a storage medium
Storage deviceRecords and retrieves items to and from a storage medium Back
Floppy Disc
What is a floppy disk?Thin, circular,
flexible disk enclosed in rigid plastic shell
A Zip disk looks similar but has much greater storage capability
(=170 floppy disk) Back
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Hard Disc of a Computer
What is a hard disk?Provides much
greater storage capacity than a floppy disk or Zip disk
Housed inside the system unit
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Compact Disc of a Computer
What is a compact disc?Flat, round, portable metal disc
CD-ROM CD-RWCapacity: 673~768 MB
DVD-ROM DVD+RW
Capacity:4.7 ~ 17.1 GB
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