TC2-Computer Literacy Mr. Sencer February 3, 2010 Introduction to Computers
A World of Computers • Computers have become an essential part of our daily lives. • Computers are found at work, at home and at school. • Computers come in all shapes and forms.
A World of Computers • Desktops, Laptops, Netbooks are all types of computers. • Some mobile phones or Smartphone's are also considered computers. • Computers are a method of communication for billions of peopleworldwide.
A World of Computers • Computers allow for instant communication by using email or instant messaging software. • Through computers, society has instant access to information from around the globe. • Information such as news, weather reports, sports scores, airline schedules, telephone directories, maps and directions, job listings, and other countless items are always accessible.
A World of Computers • Computers in our daily lives: • Banks use ATMs (automated teller machines) so customers can deposit and withdraw funds anywhere at anytime.
A World of Computers • Grocery stores use computers to track purchasing, calculating the amount due for a purchase, and even generates coupons based on buying patterns.
A World of Computers • Cars use onboard navigation systems that provide directions, assistance in emergency situations, and allow the vehicle to be tracked the vehicle if it is stolen.
Computer Literacy • As technology continues to advance, computers become a larger part of our lives. • Computer literacy is having a current knowledge and understanding of computers and their uses. • also known as digital literacy • Since computers and technology change so rapidly you must keep up with these changes to be computer literate.
What is a computer? • A computer is: • Anelectronic device operatingunder the control of instructions stored in itsown memory, that can accept data, processthe data according to specified rules, produceresults, and store the results for future use.
Data and Information • Computers process data intoinformation. • What is Data? • Data is a collection of unprocessed items,such as text, numbers, images, audio, and video. • What is Information? • Information is processed data and is usually useful to people. • What’s the difference?
An Example of Data and Information • In this example, the item ordered, item price, quantity ordered, and amount received all represent data. The computer processes the data to produce the cash register receipt (information). • As shown, computersprocess several data items to print information in the form of a cash register receipt.
Information Processing Cycle • Computers process data (input) into information (output). • Computers carry out processes using instructions. • Instructions are the steps that tell the computer how to perform a particular task. • Some people refer to the seriesof input, process, output, andstorage activities as the information processing cycle.
The Components of a Computer • A computer contains many electric, electronic, and mechanical components known as hardware. • These components include: • input devices • output devices • a system unit • storage devices • communications devices
Input devices • An input device is any hardware that allows you to enter data and instructionsinto a computer. • Five common input devices: • Keyboard • Mouse • Microphone • Scanner • Web cam
Output devices • An output device is any hardware that transmits information to one or more people. • Three common output devices: • Printer • Monitor • Speakers
A System Unit • The system unit is a case that contains the electronic components of the computer that are used to process data. • The main circuit board of a computer is found in the system unit. It is called the motherboard.
Motherboard Inside the System Unit • Two main components located on the motherboardare the processor and memory. • The processor, also called a CPU (central processing unit), is the electronic component that interprets and carries out the instructions that operatethe computer. • The memory consists of electronic components that store the instructions and data needed.
Storage Devices • Storage holds data, instructions, and information for future use by the computer. • A computer keeps data, instructions, and information on storage media
Storage Media • Examples of storage media: • USB flash drives • hard disks • Optical discs • memory cards
Storage Devices • A storage devicerecords (writes) and/or retrieves (reads) items to and from storage media. • Storage devices often classifiedas an input because they transfer items from storage to memory.
Communications Devices • Communications devices are hardware that enables a computer to send (transmit) and receive data, instructions, and information to and from one or more computers or mobile devices. • A common communications device is a modem.