3. Input Devices Device Features Cost Keyboard Entering text £5-£50 Mouse Control the pointer £3-£30 Touchpad Control the pointer on a laptop Microphone Enter Sound £10-£50 Digital Camera Input Images (Resolution measured in Megapixels) £50-£1000 Scanner Input paper images (Resolution 600-4800dpi) £30-£200 Webcam Video conferencing £10-£200
4. Output Devices Device Features Cost Liquid Crystal Display Monitor Low power flat screen used for palmtop and laptop <£100 Thin Film Transistor Monitor More Expensive flat screen <£200 Cathode Ray Tube Monitor Bulky Monitor Inkjet Printer Squirts ink on to page. High Quality photo printing £50-£1000 Laser Printer Uses electric charge and toner dust (very fast) £100-£1000 Loudspeaker Used to output sound £10-£80
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7. Backing Storage Media Type Capacity Features Floppy Disk Magnetic 1.44Mb Very low capacity – outdated Zip Disk Magnetic 100Mb-800Mb Compressing files for storage Hard Disk Magnetic 100Gb – 1Tb Very fast data transfer rate Tape Magnetic 1Tb – 100Tb High Capacity but very slow transfer rate CDROM Optical 700Mb Contents written at manufacture CD-Recordable Optical 700Mb User can store to once then becomes ROM CD-ReWriteable Optical 700Mb Contents can be written a number of times DVD-ROM Optical 4.7Gb Faster transfer than CD DVD-R/RW Optical 4.7Gb USB Memory Stick Magnetic 1Gb-32Gb Very portable
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