As human enters a age of information The advantages and disadvantages becomes increasingly The advantages are that internet made life much more convenient and People can shop， read， learn， interact and a whole lot more from their computer It draws the world closer and makes lifes There are also On the internet， everyone is invisisble， this makes online fraud and identitity theft increasingly popular and Also， on the internet， almost everyone can post or edit information， which means information on the web are not always Therefore， as we become more and more relient on the internt， it' ;s advantages and disadvantages should not be
Information literacy Knowing how to find data from several sources， select relevant material， analyse and organise it into a form that can be used to make Computers have become the tools people use to access and manage Information technologists are people who analyse and design the What is a computer? Tradition definitions of computers include • A machine that accepts data and processes it into use • A computer is a binary， digital， electronic， stored program • While a computer is commonly a digital machine， analogue machine do An electronic device， operating under the control of instructions stored in its own memory unit， that can accept data (input)， process data arithmetically and logically， produce results (output) from the processing and stores results for future Many computers receive and send data (communicate) across networks LAN and W A computer system consists of hardware and What is hardware? Hardware Hardware is physical devices or components that can be physically handled – you can thou Input Devices Input devices convert data that humans collect into coded electrical signals that a computer can The central processing unit The electronic processing takes place in the CPU The CPU consists of • A control unit that controls all of the computer’s functions and an • Arithmetic and logical unit (ALU) that performs any calculation Memory Memory holds all programs and What is RAM currently open? Data (notes) Word processor OS Output devices Output devices convert the computer’s electronic signals back into information Secondary storage devices These devices store programs and data The programs and data are not necessarily (or likely to be) in current E DVD CD Communication devices These devices enable a computer to connect to another List the six different type of hardware? Secondary storage(external)， input， processor， output ， memory， C Name eight pieces of hardware USB， keyboard， monitor， screen， RAM， ROM， VDU， M The system unit and peripheral devices The system unit is the computer Peripheral devices are any devices around the outside， or in other words， plugged into the (back of) the Peripheral devices include the key board， mouse， printer， joy stick and Peripheral devices are any devices around the outside， or in other words， plugged into the (back of) the Peripheral devices include the keyboard， mouse， printer， joy stick and What else does a computer have? Software Software is a computer program ，which is a detailed set of instructions that directs a computer to perform the tasks necessary to process data into These instructions are written in languages that computer can Software includes computer games， a word processing packing， an accounting package， amongst Definition of a computer system • A computer system is the configuration of hardware and software， functioning together， to process data into useful information， in order to achieve a purpose for a human What is data? • Data is raw facts， be they numbers， words， images and sounds， that can be input into a Mary a name is a piece of data What is information? • Information is processed data， that has meaning and is John is a list of names who scored an A grade on an exam John A Chai A Pam A Commodore $23 500 Magna $21 500 Falcon $19 800 The system unit contains the • Motherboard • CPU • Memory • Other electronics It is where the computer program instructions are executed and the data is manipulatedThe Processor CPU The CPU interprets and carries out basic instructions that operate the computer， the CPU contain the • Control unit and the • Arithmetic logic unit Control unit The control unit directs and coordinates the computer’s For every single instruction， the control unit repeats four basic operations， • Fetching • Decoding • Executing • Storing CPU speed The CPU’s speed may be measured in MIPS The number of millions of instructions per second Arithmetic/logic unit The ALU performs all calculations， which involve • Arithmetic operations 2+3 • Comparison operations age>=17 • Logical operations pass Processing instructions A CPU may begin executing a second machine cycle before completing the first-referred to as Current CPU’s can pipeline up to 4 Storage within the CPU Registers temporarily hold data and The computer’s clock A System clock is necessary to control the timing of all computer Each tick of the clock is referred to as a clock Clock speed is the speed at which a processor executes A hertz is one cycle per second and a megahertz is 1024 by1024 and a gigahertz is 1024 by 1024 Memory Memory is the temporary storage place for data and (program) Memory is measured in • Kilobytes 1024 bytes 2^10 • Megabytes 1024* 1024 bytes 2^20 • Gigabytes 1024*1024*1024 bytes 2^30 Representation of data Digital computers are built from many small electronic Each circuit， at any point of time can be turned OFF or ON Hence these devices are called two state Binary Digit 0and 1 Each off or on digital value is called a bit， short for binary A 1 bit computer would be able to distinguish between two values-characters， symbols or Hardly sufficient for the characters on the keyboard Bits Characters 1 2 2 4 3 8 4 16 5 32 6 64 7 128 8 256
Nowadays， technology is everywhere around The development of technology has a significant affact toward the Several technologies that we usually use are the internet， computer， and These new technologies make our life much easier and First， the development of computer changes our Decades ago， people needed to do lots of complex calculation on hand because they did not have computer， and more obvious， they did not have the software for As the result of that， people spent hours on the equations that a computer can solve in just a Since the development of computer， people are able to use some kind of software to compute lots of complex functions and mathematical Computer becomes the most helpful equipment for the sciencists because they can use their time more In conclusion， I believe the development of technology brings significant impact to our It is very helpful to us and I believe technology will keep improving in
