Presentation on theme: "Introduction To Computer System"— Presentation transcript:
1 Introduction To Computer System Module 1Introduction To Computer System
2 Module 1 Objectives At the end of the lesson, you should be able to : Identify the basic concept and usage of a computerIdentify the basic component of a computerDiscuss the advantages and disadvantages of computersRecognize the purpose of network and the use of internet and networkDifferentiate between system software and application softwareDescribe the categories of computers
3 Computer What is computer literacy? Knowledge of computers and their usesComputers are everywhere
4 What is a computer? How is a computer defined? It is an electronic device operating under the controls of instruction stored in its memory.
5 What Is Computer ? The information processing cycle consist the below: InputProcessOutputStorageCommunication
6 Information Processing Cycle CommunicationInput: Accepting data that has been represented in a way that the computer can use.Processing: Performing arithmetic or comparison (logical) operations on the represented data.Output: Displaying resultsStorage: Storing results for later reuse.Communication: Transferring data to from one point to another
7 Computer System Components Input devicesOutput devicesSystem unit
8 Input devicesHardware used to enter data and instructions
9 Output devicesHardware that is used to convey messages to one or more people
10 System UnitCase containing electronic components used to process data
12 StorageStorageHolds data, instruction and information for future use.Storage mediaPhysical material on which data, instructions and information is stored.Storage deviceRecords and retrieves items toand from storage devices
13 Communication Devices Hardware component that enables a computer to send and receive data, instructions and information.Occurs over cables, telephone lines, cellular radio networks and other transmission media.
14 Advantages of using a computer SpeedReliabilityConsistencyStorageCommunications
15 Disadvantages of using Computers Violation of privacyImpact on labor forceHealth riskImpact on environment
16 Networks and the Internet What is a network?Network is a collection of computers and devices connected together
18 Networks and the Internet Generally, a network uses a client server architectureServers managesresources on anetworkClient access theresources from theserver.Networks and the Internet
19 Networks and the Internet What is Internet?Internet is a world wide collection of networks that connects millions of businesses, government agencies, educational institutions and individuals.
20 Networks and the Internet Users access the internet for :CommunicationsInformationShoppingBanking and InvestingClassesEntertainment
21 Networks and the Internet What is The WWW (World Wide Web)?consist of billions of documents, called web pages, available to anyone connected to the Internet.
22 What is Software ? Series of instructions that process data Two kinds System softwareUsed by the computerApplication softwareUsed by the userA computer system requires software to make the best use of its capabilities and to solve problems
23 What is System Software ? Enables application software to interact with computer hardwareA “Background” software manage internal computer resources and coordinate the application software requests with computer hardware without user interactionOperating system softwareMost important system softwareExecutes application softwareStores data and programsmanages all the overall operation of the computer systemI.e. Eg. Window 2000, Linux, UNIX, Sun Solaris, Mac OS X
24 What is Application Software ? End-user software enter commands and typically interact with application programs.General-purpose programsSome types: Browsers, Spreadsheet, Database management systems, presentation graphics, word processori.e Internet Explorer, Microsoft Word, PowerPointSpecial-purpose programsCustom written for specialized taskswritten for an organization’s or business type’s specific purposei.e. Online Registration System
25 Graphical User Interface (GUI) What is a graphical user interface?Allows you to interact with the software using graphics and icon.Controls how you enter data and how the screen displays information.
27 Categories of Computers DesktopMobile computers and mobile devicesMidrange serversMainframesSupercomputersEmbedded computers
28 Further ReadingH.L. Capron, J.A. Johnson. Computers: Tools for an Information Age. Seventh Edition. Prentice-Hall. -- Chap 1Ron White. How Computers Work. Millennium Edition. QUE. -- Chap 1Larry Long, Nancy Long. Computers. 8th Edition. Prentice-Hall. -- Chap 1