This document discusses computer peripherals and storage devices. It provides details about input devices like keyboards, mice, microphones; output devices like monitors, printers, speakers; and storage media like floppy disks, hard disks, CDs, DVDs. It explains that interfaces are needed between peripherals and the CPU to compensate for differences in speed and perform analog to digital conversion and temporary data storage.

1. Peripherals Mr Arthur

2. Aims of Lesson 1 To go over the Computer Structure test Begin Unit 3 – Peripherals Features of Input/Output Devices

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

5. Lesson Starter List 3 examples of Monitors What input device controls the pointer on a laptop? Give 2 features you would use to compare printers

6. Aims of Lesson 2 Last Lesson Input/Output Devices Today’s Lesson Features of Backing Storage Devices

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 Backing Storage Media Type Capacity Features Floppy Disk Magnetic 1.44Mb Very low capacity – outdated Zip Disk Magnetic 100Mb-800Mb Compressing files for storage Hard Disk Magnetic 100Gb – 1Tb Very fast data transfer rate Tape Magnetic 1Tb – 100Tb High Capacity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

8. Lesson Starter What is the name of the Magnetic storage media that compresses files? What is the difference between a DVD ROM, DVD-R and DVD-RW? Suggest a suitable storage media to store a backup copy of Photographs from a wedding that is 16Gb

9. Aims of Lesson 3 Last Lesson Input/Output Devices Features of Backing Storage Devices Today’s Lesson Functions of an Interface

10. Interface An interface is a piece of hardware positioned between a peripheral and the CPU. The interface compensates for any differences Functions The interface compensates for the difference in speed between the processor and peripheral (Processor runs much faster) Analogue to Digital Conversion (Microphone – Processor) Interface may temporarily store data, for example, the buffer in the printer

11. Arrangements Description of the features, functions and uses of the following input devices: keyboard, mouse, microphone, touchpad, digital camera, scanner, webcam Comparison of input devices using appropriate characteristics including resolution capacity, speed of data transfer, cost Description of the features, functions and uses of a monitor, LCD panel, inkjet and laser printers, loudspeakers Comparison of output devices using appropriate characteristics including resolution, capacity, speed of data transfer, cost Magnetic storage: description of the features, functions and uses of current magnetic storage devices and media including floppy drive, hard drive, zip drive, magnetic tape drive Optical storage: description of the features, functions and uses of current optical storage devices and media including CD-ROM, CD-R, CD-RW, DVD-ROM, rewritable DVD Comparison of storage devices using appropriate characteristics including type of access, capacity, speed of data transfer, cost Description of the need for interfaces with reference to the following functions: compensating for differences in speed between the CPU and peripherals, data conversion from analogue to digital forms and temporary data storage