Objectives Overview Explain why computer literacy is vital to success in today's world Describe the five components of a computer Discuss the advantages.

Objectives Overview Explain why computer literacy is vital to success in today's world Describe the five components of a computer Discuss the advantages and disadvantages that users experience when working with computers Discuss the uses of the Internet and World Wide Web Distinguish between system software and application software See Page 1 for Detailed Objectives Discovering Computers Fundamentals, 2011 Edition Chapter 1

Information Processing Cycle
What Is a Computer? A computer is an electronic device, operating under the control of instructions stored in its own memory Collects data (input) Processing Produces information (output) Information Processing Cycle Pages 3 - 4 Discovering Computers Fundamentals, 2011 Edition Chapter 1

Discovering Computers Fundamentals, 2011 Edition Chapter 1
What Is a Computer? Page 4 Figure 1-2 Discovering Computers Fundamentals, 2011 Edition Chapter 1

The Components of a Computer
A computer contains many electric, electronic, and mechanical components known as hardware Allows you to enter data and instructions into a computer Input Device Hardware component that conveys information to one or more people Output Device Case that contains the electronic components of the computer that are used to process data System Unit Holds data, instructions, and information for future use Storage Device Enables a computer to send and receive data, instructions, and information to and from one or more computers or mobile devices Communications Device Pages 4 - 7 Discovering Computers Fundamentals, 2011 Edition Chapter 1

The Components of a Computer
Page 5 Figure 1-3 Discovering Computers Fundamentals, 2011 Edition Chapter 1

Advantages and Disadvantages of Using Computers
Speed Reliability Consistency Storage Communications Violation of Privacy Public Safety Impact on Labor Force Health Risks Impact on Environment Page 7 Discovering Computers Fundamentals, 2011 Edition Chapter 1

Examples of Computer Usage
Home User Personal financial management Web access Communications Entertainment Small Office/ Home Office User Look up information Send and receive messages Make telephone calls Mobile User Connect to computers on a network or the Internet Transfer information Play video games Listen to music Watch movies Power User Work with multimedia Use industry-specific software Enterprise User Communicate among employees Process high volumes of transactions Blog Pages 20 – 24 Figures 1-26 – 1-30 Discovering Computers Fundamentals, 2011 Edition Chapter 1

Input & output devices Input is any data and instructions entered into the memory of a computer Pages 188– 189 Figure 5-1 Discovering Computers Fundamentals, 2011 Edition Chapter 5

What Is Input? An input device is any hardware component that allows users to enter data and instructions into a computer Page 188 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Pen Input With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections Page 194 Figure 5-11 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Other Types of Input A flatbed scanner creates a file of the document in memory Works in a manner similar to a copy machine Page 200 Figure 5-18 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Other Types of Input Optical character recognition (OCR) involves reading characters from ordinary documents A turnaround document is a document you return to the company that creates and sends it Page 200 Figure 5-19 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Other Types of Input Optical mark recognition (OMR) reads hand-drawn marks such as small circles or rectangles Page 200 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Other Types of Input A bar code reader, also called a bar code scanner uses laser beams to read bar codes Page 201 Figure 5-20 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Other Types of Input RFID (radio frequency identification) uses radio signals to communicate with a tag placed in or attached to an object An RFID reader reads information on the tag via radio waves RFID can track: Tracking times of runners in a marathon Tracking location of soldiers Employee wardrobes Airline baggage Checking lift tickets of skiers Managing inventory Gauging pressure and temperature of tires Checking out library books Tracking toll payments Page 201 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Other Types of Input Magnetic stripe card readers read the magnetic stripe on the back of cards such as: Credit cards Entertainment cards Bank cards Other similar cards Pages 201 Figure 5-22 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Other Types of Input MICR (magnetic ink character recognition) devices read text printed with magnetized ink An MICR reader converts MICR characters into a form the computer can process Banking industry uses MICR for check processing Page 202 Figure 5-23 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Other Types of Input Biometrics authenticates a person’s identity by verifying a personal characteristic Fingerprint reader Face recognition system Hand geometry system Voice verification system Signature verification system Iris recognition system Retinal scanners Pages Discovering Computers Fundamentals, 2011 Edition Chapter 5

What Is Output? Output is data that has been processed into a useful form Pages 206 – 207 Figure 5-29 Discovering Computers Fundamentals, 2011 Edition Chapter 5

What Is Output? An output device is any type of hardware component that conveys information to one or more people Display devices Printers Speakers, headphones, and earbuds Data projectors Interactive whiteboards Page 206 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Printers A printer produces text and graphics on a physical medium Before purchasing a printer, ask yourself a series of questions Page 211 Figure 5-34 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Printers A nonimpact printer forms characters and graphics on a piece of paper without actually striking the paper Ink-jet printers Photo printers Laser printers Plotters Large-format printers Page 213 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Printers An ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper Color or black-and-white Printers with a higher dpi (dots per inch) produce a higher quality output Page 213 Figure 5-36 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Printers A photo printer produces color photo-lab-quality pictures Most use ink-jet technology PictBridge allows you to print photos directly from a digital camera Print from a memory card and preview photos on a built-in LCD screen Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Photo Printers below Chapter 5 Page 214 Figure 5-37 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Printers Laser printer High-speed High-quality Color Black-and-white Click to view Web Link, click Chapter 5, Click Web Link from left navigation, then click Laser Printers below Chapter 5 Pages 214 – 215 Figure 5-38 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Printers A multifunction peripheral (MFP) is a single device that prints, scans, copies, and in some cases, faxes Sometimes called an all-in-one device Page 215 Figure 5-39 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Printers Plotters are used to produce high-quality drawings Large-format printers create photo-realistic quality color prints on a larger scale Page 216 Figure 5-42 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Printers Impact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper Dot-matrix printer Line printer Page 217 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Printers A dot-matrix printer produces printed images when tiny wire pins on a print head mechanism strike an inked ribbon A line printer prints an entire line at a time Page 217 Figure 5-43 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Input and Output Devices for Physically Challenged Users
Head-mounted pointer Braille printer Pages 220 – 221 Figures 5-48 – 5-49 Discovering Computers Fundamentals, 2011 Edition Chapter 5

Storage Storage holds data, instructions, and information for future use A storage medium is the physical material on which a computer keeps data, instructions, and information Pages Discovering Computers Fundamentals, 2011 Edition Chapter 6

Storage Pages 238 – 239 Figure 6-1 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Storage Capacity is the number of bytes a storage medium can hold Page 240 Figure 6-2 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Storage A storage device is the computer hardware that records and/or retrieves items to and from storage media Reading is the process of transferring items from a storage medium into memory Writing is the process of transferring items from memory to a storage medium Page 240 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Storage Access time measures the amount of time it takes a storage device to locate an item on a storage medium Page 240 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Hard Disks A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information Pages Figure 6-3 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Hard Disks The hard disk arms move the read/write head, which reads items and writes items in the drive Location often is referred to by its cylinder Page Figure 6-7 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Hard Disks A head crash occurs when a read/write head touches the surface of a platter Always keep a backup of your hard disk Page 244 Figure 6-8 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Hard Disks An external hard disk is a separate free-standing hard disk that connects to your computer with a cable or wirelessly A removable hard disk is a hard disk that you insert and remove from a drive Internal and external hard disks are available in miniature sizes (pocket hard drive) Pages 244 – 245 Figures 6-9 – 6-10 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Flash Memory Storage Flash memory chips are a type of solid state media and contain no moving parts Solid state drives (SSDs) have several advantages over magnetic hard disks: Faster access time Faster transfer rates Generate less heat and consume less power Last longer Page 247 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Flash Memory Storage Click to view Web Link, click Chapter 6, Click Web Link from left navigation, then click SDHC Cards below Chapter 6 Pages Figures 6-13 – 6-14 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Flash Memory Storage USB flash drives plug into a USB port on a computer or mobile device Page 250 Figure 6-15 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Cloud Storage Cloud storage is an Internet service that provides storage to computer users Page 251 Figure 6-17 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Cloud Storage Page 251 Figure 6-18 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Cloud Storage Users subscribe to cloud storage for a variety of reasons: Access files from any computer Allow others to access their files View time-critical data and images immediately Store offsite backups Provide data center functions Click to view Web Link, click Chapter 6, Click Web Link from left navigation, then click Cloud Storage below Chapter 6 Page 252 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Optical Discs A CD-ROM can be read from but not written to Read from a CD-ROM drive or CD-ROM player A CD-R is a multisession optical disc on which users can write, but not erase A CD-RW is an erasable multisession disc Must have a CD-RW drive Pages Figure 6-21 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Optical Discs A DVD-ROM is a high-capacity optical disc on which users can read but not write or erase Requires a DVD-ROM drive A Blu-ray Disc-ROM (BD-ROM) has a storage capacity of 100 GB DVD-RW, DVD+RW, and DVD+RAM are high-capacity rewritable DVD formats Click to view Web Link, click Chapter 6, Click Web Link from left navigation, then click Blu-ray below Chapter 6 Pages 253 – 256 Figure 6-21 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Other Types of Storage Tape is a magnetically coated ribbon of plastic capable of storing large amounts of data and information A tape drive reads and writes data and information on a tape Page 257 Figure 6-26 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Other Types of Storage A magnetic stripe card contains a magnetic stripe that stores information A smart card stores data on a thin microprocessor embedded in the card Page 257 Figure 6-27 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Other Types of Storage Microfilm and microfiche store microscopic images of documents on a roll or sheet film Page 258 Figure 6-28 Discovering Computers Fundamentals, 2011 Edition Chapter 6

Objectives Overview Explain why computer literacy is vital to success in today's world Describe the five components of a computer Discuss the advantages.

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Objectives Overview Explain why computer literacy is vital to success in today's world Describe the five components of a computer Discuss the advantages.

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