Chapter Three Peripherals and Networking Part I: Peripheral Devices

© Wiley, Inc. All Rights Reserved. Strata Objectives Covered 1.2 (1.2 FCO-11 U.K.) Demonstrate the proper use of the following devices –Monitors 1.3 (1.2 FCO-11 U.K.) Demonstrate the ability to set up a basic PC workstation –Identify differences between connector types: DVI, VGA, HDMI; Bluetooth and Wireless; Network connectors; 3.5mm audio jack –Monitor types –Printer (USB, wireless, networked) 2

© Wiley, Inc. All Rights Reserved. Strata Objectives Covered (continued) 1.4 Explain the characteristics and functions of peripheral devices –Digital camera –Speaker –Tuner –Microphone –Printer/scanner 3

© Wiley, Inc. All Rights Reserved. What is a Peripheral? A device that is external to the main body of the computer A device that isn’t essential to the computer’s functioning 4

© Wiley, Inc. All Rights Reserved. The Printing Process 1.Receive data from the PC 2.Store the data in RAM 3.Convert the data to print instructions 4.Feed the paper 5.Store and dispense ink and toner 6.Transfer the image to the paper 5

© Wiley, Inc. All Rights Reserved. Differences Between Printers Printer type (inkjet, laser) Costs (initial, consumables) Output quality and resolution Photo printing capability Speed Paper tray Interfaces Multi-function 6

© Wiley, Inc. All Rights Reserved. Inkjet Printers Squirt liquid ink onto paper Between 21 and 256 nozzles for each of the four colors Cyan, yellow, magenta, and black Some photo printers have 6 or 8 cartridges 7

© Wiley, Inc. All Rights Reserved. Inkjet Technologies Thermal (bubble jet): heat the ink, creating vapor bubbles that force the ink out. This creates a vacuum in the cartridge which draws more ink into the nozzles. Piezoelectric: moves the ink with electricity instead of heat. Nozzles contain piezoelectric crystals that change their shape when electricity is applied to them and force out the ink 8

© Wiley, Inc. All Rights Reserved. Laser Printer Drum (large cylinder) carries high negative electrical charge Laser partially neutralizes the charge on areas of the drum Toner clings to the areas of lesser charge Toner jumps off onto positively charged paper Fuser melts toner onto the paper 9

© Wiley, Inc. All Rights Reserved. Printer Interfaces USB Legacy parallel Network Bluetooth 10

© Wiley, Inc. All Rights Reserved. Monitors Liquid Crystal Display (LCD) –Flat, thin, low power consumption –Light passes through filters and liquid crystals to create the image 11

© Wiley, Inc. All Rights Reserved. Monitors Cathode Ray Tube (CRT) –Large, boxy monitor, old technology –Vacuum tube that uses electron guns to light up phosphors on the inside of the monitor glass to form the image 12

© Wiley, Inc. All Rights Reserved. Monitor Connectors Video Graphics Array (VGA) –Older standard –Analog 13

© Wiley, Inc. All Rights Reserved. Monitor Connectors Digital Video Interface (DVI) –Newer standard –Can be digital or analog (mostly digital) 14

© Wiley, Inc. All Rights Reserved. Monitor Connectors High-Definition Multimedia Interface (HDMI) –Used for TVs and home theater –Less frequently used for computers –Digital 15

© Wiley, Inc. All Rights Reserved. Sound System Sound card (or sound adapter built into motherboard) Speakers Microphone Jacks for other external devices, such as headphones 16

© Wiley, Inc. All Rights Reserved. Speakers Amplification Shielding Frequency range Analog vs. digital: if digital, use special digital output port from sound card 17

© Wiley, Inc. All Rights Reserved. Microphone May be built into notebook computer Frequency response Stereo vs. mono Unidirectional vs. omnidirectional Headset vs. desktop Analog vs. digital 18

© Wiley, Inc. All Rights Reserved. Scanner Digitizes flat hard-copy image Uses charge-coupled device (CCD) 19

© Wiley, Inc. All Rights Reserved. Scanner Quality measured in dots per inch (DPI) –Horizontal DPI: also called x-direction sampling rate –Vertical DPI: also called y-direction sampling rate 20

© Wiley, Inc. All Rights Reserved. Digital Camera Stores camera images to digital media, such as flash RAM Transfers photos to PC, printer, or other digital device Resolution measured in megapixels (millions of pixels) Example: 10 megapixels = 3872 wide by 2592 high 21

© Wiley, Inc. All Rights Reserved. Digital Camera Camera size Zoom Storage medium PC interface Manual adjustments Delay between pictures Video capture 22

© Wiley, Inc. All Rights Reserved. Web cams Low-resolution video camera that feeds its images directly into a computer or network Must have a connection to a computer to operate 23

© Wiley, Inc. All Rights Reserved. TV Tuners Peripheral device that enables a computer to receive, display, and store TV broadcasts 24