inroduction to computer
TRANSCRIPT
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Discovering computers 2015 ----A gateway to information
Introduction to Computers
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How is a computer defined?What Is a Computer?
Electronic device operating under the control of instructions stored in its own memory
The computer first, Accepts data such as raw facts, figures, and symbol then, Processes data into information (Data that is organized, meaningful, and useful ) finally, Produces and stores results
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Example
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information processing cycle
Input
Process
Output Storage
Communication
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CharacteristicsSingle User / Multi User
Single Tasking / Multi Tasking
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Pros & Cons
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The Components of a ComputerWhat is an input device? Hardware used
to enter dataand instructions
_____
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The Components of a ComputerWhat is an output device? Hardware that
conveys information to a user
______
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The Components of a ComputerAny device that is both input and output??? Touch screen LCD/LEDs
Modem
CD/DVD
Headset
Digital Camera
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The Components of a ComputerWhat is the system unit? Box-like case
containingelectroniccomponentsused to processdata
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What is the magical inside the black box?
CPU
Memory card
Sound Card
Video Card
Storage Units
PowerSupply
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The Components of a ComputerWhat 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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The Components of a ComputerWhat is storage?
Storage mediaPhysical material on which data, instructions, and information are stored
Storage deviceRecords and retrieves items to and from a storage medium
Holds data, instructions, and information for future use
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Storage deviceWhat 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)
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The Components of a ComputerWhat 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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The Components 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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The Components of a ComputerWhat is miniature storage media?
Digitalcameras
Handheldcomputers
Portable, thin memory cards used in:
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Why Is a Computer So Powerful?
What makes computer powerful? Speed Reliability Accuracy Storage Communications
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Computer Software
How do you install and run a software program?
Step 1.Insert the program disc into the CD-ROM drive
Step 2. Install the software program by instruction in the disc, then run the program
Step 3. The program executes
A program is a series of instructions that tells the computer what to do
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Computer Software
What was before GUI ????
Allows you to interact with the software using graphics and icons
Controls how you enter data and how the screen displays information
What is a graphical user interface (GUI)?
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Command Line Interface
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Computer SoftwareWhat is system software?
Operating System (OS)is a set of programs that coordinates all activities among computer hardware devices and allows users to run application software
Utility Programs allow the user to perform maintenance-type tasks usually related to managing a computer, its devices or its programs
Programs that control the operations of the computer and its devices
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Computer SoftwareWhat is application
software?
Presentation Graphics
Spreadsheet
Database
Word Processing
Programs that perform specific tasks for users
SuitePopular software applications bundled together as a single unit
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Computer Software
What is a programmer? Someone who develops
application or system software
Programmer writes instructions todirect computer to process data into information
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DATA RepresentationDigital (Discrete)Analog (Continuous)
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DATA Storage
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