Computer Literacy for IC 3 Unit 1: Computing Fundamentals © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.1 Chapter 2: Identifying Computer Components and Their Functions

Learning Targets Unit 1, Chapter 2 5.I can identify basic input and output components 6.I can identify specialized input devices 7.I can identify specialized output devices 8.I can give several examples of connecting devices to a computer © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.2

Basic Input and Output Components System unit contains central processing unit (CPU) Input and output components Outside of system unit – plug into the system unit Some are portable 3© 2010 Pearson Education, Inc. | Publishing as Prentice Hall.

Monitors CRT – Cathode ray tube Convex Older technology LCD – Liquid crystal display Fluorescent light called backlight Pixels determine resolution 4© 2010 Pearson Education, Inc. | Publishing as Prentice Hall.

The Mouse Controls the pointer on the screen Different types Traditional, wired mouse Rubber ball and rollers Optical mouse Reads reflections of a beam of light 5© 2010 Pearson Education, Inc. | Publishing as Prentice Hall.

Other Mouse Alternatives Trackball Thumb mouse Pointing stick Touch pad © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.6

The Keyboard Most commonly used input device Keystrokes are converted to binary numbers Combinations of keys can be pressed to quickly perform routine functions QWERTY vs. Dvorak Special function keys CTRL, ALT, Shift – these keys do nothing if you simply press them, but are used in conjunction with other keys © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.7

The Dvorak Keyboard © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.8 Vowels and punctuation on the LEFT Consonants on the RIGHT

Optical Discs CDs, DVDs, and Blu-rays are optical discs CD – compact disc CD-ROM (read only), CD-R (write once), CD-RW (rewritable) DVD – digital video disc or digital versatile disc DVD-ROM (read only), Recordable DVD (+R & -R), DVD-RW (rewritable) Blue-ray – new technology BD-ROM (read only), BD-R (write once), BD-RE (rewritable) 9© 2010 Pearson Education, Inc. | Publishing as Prentice Hall.

Storage Capacity and Uses of Optical Discs CD Oldest, most common optical disc Boxed software likely comes on CD-ROM Holds about 650 megabytes DVD 4.7 gigabytes on single-sided DVD 17 gigabytes on double-sided DVD Blu-ray Newest technology Holds up to 25 gigabytes (single-sided) 10© 2010 Pearson Education, Inc. | Publishing as Prentice Hall.

Flash Memory Flash drive, thumb drive, USB drive, jump drive Different names for the same thing Constant power not required – can unplug them and they “remember” Solid state - no moving parts, harder to damage Used in portable electronic devices PDAs Cameras 11© 2010 Pearson Education, Inc. | Publishing as Prentice Hall.

External Hard Drive Used as supplementary storage or backup 80 gigabytes to one terabyte Portable Connect through a USB port © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.12

Printers Dot-matrix Impact printer used for duplicates Ink-jet Usually four colors Photo ink-jet printers Laser Uses toner 13© 2010 Pearson Education, Inc. | Publishing as Prentice Hall.

Speakers and Microphones External or built-in speakers Optional subwoofer for low bass sound Microphones pick up sound Convert into analog signals A to D converter Voice recognition © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.14

List of Specialized Input Devices Game controllers Digital cameras Scanner Graphics tablets Bar code reader RFID Touch screen © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.15

Game Controllers Allow for simultaneous input of multiple buttons Joystick Gamepad or joypad Nintendo Wii Wireless controller 16© 2010 Pearson Education, Inc. | Publishing as Prentice Hall.

Digital Cameras: Still and Video Light-sensitive detectors convert images to binary Download images with wires or docking station Most still cameras use flash memory Point-and-shoot cameras Digital single lens reflex (DSLR) © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.17

Scanners Convert reflections to binary sequences Rated in dots per inch (dpi) OCR (optical character recognition) Used to convert scanned documents into typed text Different types Document scanner Flatbed scanner Multifunction (all-in-one) device Scanner, copier, fax, and/or printer 18© 2010 Pearson Education, Inc. | Publishing as Prentice Hall.

Graphics Tablet and Bar Code Readers Graphics tablet Also known as a digitizing tablet Flat surface Array of crossed wires Senses vertical and horizontal position of pointing device Bar code reader Narrow beam of light and a sensor Sensor converts flicker reflection into binary numbers © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.19

RFID Radio frequency ID – RFID Uses radio frequencies to remotely retrieve data Visible in automobiles on tollways © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.20

Touch Screens Touch screen Displays buttons, menus, pictures, or icons Self Service checkout in large retail stores © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.21

Sensors and Probes Sensor Detects the status of something Responds to changes in a predictable manner Probe Sensors used to explore inaccessible places Automobile exhaust pipes Volcanoes © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.22

Remote Controls Wireless devices used as input devices Numeric keypad button produces binary number Transmitted to receiver of appliance © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.23

Security Devices Password Swipe Card Biometric Devices © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.24

Adaptive Computer Devices Adaptive Keyboard/Mouse Eye Input Device Magnetic Mouse © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.25

Questions? © 2010 Pearson Education, Inc. | Publishing as Prentice Hall.26