PART 1 - CHAPTER 3 1 Input and output devices

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Objectives By the end of the lesson you are able to: Define input devices Name at least three input devices State one function of at least three input devices 3

Input Devices 4 Devices that allow you to put information into the computer: Examples:  Keyboards, Mice, Microphones  Laser pens, Graphics Tablets  Scanners, OMRs, OCRs  Digital cameras, Webcams

Keyboard 5 Suitable for:  Data entry  Typing documents Not suitable for:  Drawing

Mouse 6 Suitable for:  Selecting items  Highlighting text  Clicking buttons wheel scrolling left button Clicking, selecting, dragging right button Viewing the context menu

Laser Pen and Graphics Tablet 7 Ideal for drawing light Pengraphics Tablet

Scanner 8 Converts documents to digital images Saves you from retyping Must use OCR software if you want to edit the scanned text a flatbed scanner

Digital Camera 9 Uses digital sensor instead of film Stores images on flash memory Images can be viewed right away LCD screen

Webcam 10 Records low quality video Used for:  Videoconferencing  Chatting

Microphone 11 Like a normal microphone only smaller Used for:  Videoconferencing  Chatting online  Recording audio  Giving voice commands

Optical Mark Reader (OMR) 12 Reads pen and pencil marks on forms Used for surveys and multiple-choice Fast but gets confused by improper shading

Optical Character Reader (OCR) 13 Reads characters in printed documents Saves you from having to retype Trouble reading low quality text Used to read  Airline tickets  Envelopes  Printed bills

Output Devices 14 Devices that allow you to get information out of the computer Examples:  Monitors (Screens)  Speakers  Printers  Multimedia projectors

Barcode Scanner 15 Used in supermarkets and retail stores Identifies items by scanning barcodes  Computer system then retrieves prices Faster and more accurate

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Closure Read more about input devices by clicking on the following links: devices/read-more/ devices/read-more/ challenge/input-devices-activity/ challenge/input-devices-activity/ devices/homework/ devices/homework/ 17

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Monitor 19 LCD monitorCRT monitor

Printer 20 Produces hard copy output on paper 4 main types:  Inkjet  Laser  Dot-matrix  Thermal

Inkjet Printer 21 Squirt tiny ink droplets on paper High quality images and text Prints quickly

Laser Printer 22 Uses laser to fuse toner to paper Fastest type of printer Highest quality text Expensive

Dot-matrix Printer 23 Works almost like a typewriter Uses inked ribbon Slow and noisy Can print in duplicate using carbon paper

Thermal Printer 24 Applies heat to heat-sensitive paper Low quality output Cheap to operate Used:  To print receipts and movie tickets  In some fax machines

Impact and Non-Impact Printers 25 Impact printers:  Print by striking the paper  For example: dot-matrix Non-impact printers:  Print using other means  For example: laser, inkjet, thermal

Page Printers and Line Printers 26 Page printer:  Appears to print entire page at a time  For example: laser and inkjet printers Line printer appears to print an entire line at a time

Speakers 27 Produce audio output Like normal speakers but smaller Plug into the computer’s sound card

Multimedia Projector 28 Connects to your PC Uses lens to project images on to a wall or board Used for presentations

Questions What is Output device? Give three examples of output devices Explain the function of speaker List three different of printer Name two different monitor 29

Group Discussion You are to make a group of three. Browse the internet and search for pictures output devices and functions of: Plotter Projector Computer output on microfilm 30

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