1.1 How Does a Computer Work? Every computer operation can be divided into three stages: input, process and output. Input, process and output

1.1 How Does a Computer Work? Example of ‘input  process  output’ A student working on a worksheet Washing clothes by a washing machine

1.1 How Does a Computer Work? ‘Input  process  output’ represents the three stages of a computer operation process. Input Enter data and command into a computer. Process The computer works on the data. The computer shows the processed results. Output Three stages of a computer operation process

1.1 How Does a Computer Work? ‘Input  process  output’ represents the three stages of a computer operation process. Input Enter data and command into a computer. Process The computer works on the data. The computer shows the processed results. Output Three stages of a computer operation process

1.2 What are the Components of a Computer System? Hardware the physical part of a computer system includes a system unit and a number of external devices attached to it Software a sequence of instructions command the computer system to complete specific tasks

1.2 What are the Components of a Computer System? Hardware composed of input devices, a system unit, output devices

1.2 What are the Components of a Computer System? Input devices for entering commands or data into the computer A microphone A mouse A keyboard A scanner

1.2 What are the Components of a Computer System? System unit contains a central processing unit (CPU), circuit boards, a power supply and storage devices works on data together with the software to produce processed results System unit

1.2 What are the Components of a Computer System? Output device The processed result can be displayed to users by different output devices. A printer A monitor Speakers

1.2 What are the Components of a Computer System? Software Software can be classified into two types: system software and application software.

1.2 What are the Components of a Computer System? System software manages the operations of computer hardware helps us operate the computer system easily controls and facilitates the execution of the application software Macintosh Operating System Microsoft Windows XP

1.2 What are the Components of a Computer System? Application software carries out specific tasks for the user application software cannot be run on a computer system without the presence of an operating system

1.2 What are the Components of a Computer System? Relationship between software and hardware

Type of application software 1.2 What are the Components of a Computer System? Type of application software Function Example Word processor Create, edit, format, save and print documents. Microsoft Word Spreadsheet • Perform calculation and data manipulation. • Create charts. Microsoft Excel

Type of application software 1.2 What are the Components of a Computer System? Type of application software Function Example Presentation software Create presentations and slide shows. Microsoft PowerPoint Image editing software Edit photos and graphics. Ulead Photolmpact

Type of application software 1.2 What are the Components of a Computer System? Type of application software Function Example Communication software Exchange messages between different computers. Microsoft Outlook

Type of application software 1.2 What are the Components of a Computer System? Type of application software Function Example Communication software Exchange messages between different computers. Microsoft Outlook