201202564 Sara Naheed Amjad Information Technology Computer & it’s components
Outline What is computer ? 5 Computer Components Data & Collection Information Processing Cycle 5 Computer Components Input Output System Unit Storage Device Storage Media Communication Device
Computer What is a Computer ? A computer is an electronic device, operating under the control of instructions stored in its own memory
Computer process Data into information it is a collection of unprocessed items, which can include text, numbers, images, audio and video Information : It conveys meaning and is useful to people
Computer Process Data Store the results Accept Data Produce Results
Information Processing Cycle Computer process data (input) processes it (process) using information (output). Computer holds data information and instructions (storage ). Most computers communicate with other computer (communication)
Components of a Computer A computer contains many electric, electronic and mechanical components known as hardware. This components include: Input Device Output Device System Unit Storage Device Storage Media Communications Device
Components of a computer Input Device An input device allows you to enter data or instructions into a computer Examples of input device Keyboard Mouse Microphone Scanner Webcam
Examples of input device
Components of a computer Output Device An output device is any hardware component that conveys information to one or more people. Three most common used output device are : Printer Monitor Speakers
Examples of output device Monitor scanner Speakers
Components of a computer System Unit The System unit is a case that contains the electronic components of the computer that are used to process data A system unit includes a board called motherboard A mother board contains two component known as: Processor Memory
Processor Processor is also called a CPU (Central Processing Unit) , it is the electronic component that interprets and carries out the basic instruction that operate the computer
Memory It consists of electronic components that store instructions waiting to be executed and data needed by those instruction
Components of a computer Storage Devices Storage holds data, instructions and information for future use Storage Media Storage Device A computer keeps data, instructions and information on storage media A storage device records and reads items to and from storage media
Examples Storage Device Storage Media USB DVD Drive Hard Disk CD ROM Memory card Drive USB Hard Disk Memory cards
Components of a computer Communication Device A communication device enables a computer to send and receive data, instructions and information to and from one or more computer or mobile devices Example of Communication Device is Modem
Machine Cycle Set of four basic operations : Fetching: it is the process of obtaining a program instruction or data item from memory Decoding: used to translate the instructions into signals the computer can execute Executing: it is the process of carrying out the command Storing: writing the result to memory
References http://en.wikipedia.org/wiki/File:Linksys_ADSL_Modem_AM300.jpg http://ah-newelectronic.blogspot.com/2011/01/lg-hyun-kim-data-storage-device.html http://www.tigerdirect.com/applications/category/category_tlc.asp?CatId=9&name=Keyboards%20/%20Mice%20/%20Input