计算机介绍英文版.ppt
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1、Teacher:bai yanE-mail:,1,Chapter 1:Introduction to Computers,2,Chapter 1 Objectives,Recognize the importance of computer literacy,Define the term computer and identify its components,Explain why a computer is a powerful tool,Recognize the purpose of a network,Discuss the uses of the Internet and the
2、 World Wide Web,Distinguish between installing and running a program,Identify the types of software,Describe the categories of computers,Determine how the elements of an information system interact,Identify the types of computer users,Discuss various computer applications in society,3,A World of Com
3、puters,What is computer literacy?,p.5 Fig.1-1,Knowledge and understanding of computers and their uses,Computers are everywhere,4,How is a computer defined?,What Is a Computer?,p.6,Electronic device operating under the control of instructions stored in its own memory,5,What Is a Computer?,What is the
4、 information processing cycle?,p.6 Fig.1-2,InputProcessOutputStorageCommunication,6,The Components of a Computer,What is an input device?,p.7 Fig.1-3,Hardware used to enter dataand instructions,7,The Components of a Computer,What is an output device?,p.8 Fig.1-3,Hardware that conveys information to
5、a user,8,The Components of a Computer,What is the system unit?,p.8 Fig.1-3,Box-like casecontainingelectroniccomponentsused to processdata,9,The Components of a Computer,What are two main components on the motherboard?,p.8,Central Processing Unit(CPU)Also called a processorCarries out instructions th
6、at tell computer what to do,MemoryTemporary holding place for data and instructions,10,The Components of a Computer,What is storage?,p.8,Storage mediaPhysical material on which data,instructions,and information are stored,Storage deviceRecords and retrieves items to and from a storage medium,Holds d
7、ata,instructions,and information for future use,11,The Components of a Computer,What is storage media?,p.8,Digitalcameras,Handheldcomputers,Portable,thin memory cards used in:,12,The Components of a Computer,What is a floppy disk?,p.8 Fig.1-4,Thin,circular,flexible disk enclosed in rigid plastic she
8、ll,A USB flash drive is portable,and has much greater storage capacity,13,The Components of a Computer,What is a flash drive?,p.9 Fig.1-5,Provides much greater storage capacity than a floppy disk or Zip disk,Small and lightweight enough to be transported on a keychain or in a pocket,14,The Component
9、s of a Computer,What is a flash drive?,15,The Components of a Computer,What is a hard disk?,p.9 Fig.1-6,Provides much greater storage capacity than a floppy disk or USB flash drive,Housed inside the system unit,16,The Components of a Computer,What is a compact disc?,p.9 Fig.1-7,Flat,round,portable m
10、etal disc,CD-ROMCD-RWDVD-ROMDVD+RW,17,Why Is a Computer So Powerful?,p.10,What makes a computer powerful?,18,Networks and the Internet,What is a network?,p.10,Communications Media,Communications Device,Collection of computers and devices connected together,19,To share,Networks and the Internet,What
11、are the reasons to network?,p.10,Resources,Hardware devices,Software programs,Data,To save time and money,Information,20,Networks and the Internet,What is a server?,p.10 Fig.1-8,Manages the resources on a network,A client accesses the resources on the server,21,Networks and the Internet,What is the
12、Internet?,p.11 Fig.1-9,Worldwide collection of networks that connects millions of computers,22,Networks and the Internet,p.12 Fig.1-10,Why do users access the Internet?,Information,Shopping,Banking and Investing,Classes,Entertainment,Communications,23,Networks and the Internet,What is the Web?,p.13,
13、A Web site is a collection of related Web pages,A Web page contains text,graphics,sound,video,and links to other Web pages,You can share information by creating Web pages or posting photos on a photo community,Billions of documents,called Web pages,available to anyone connected to the Internet,24,Co
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