Peripherals
Mr Arthur
Aims of Lesson 1
1. To go over the Computer Structure test
2. Begin Unit 3 – Peripherals
3. Features of Input/Output Devices
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
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
Lesson Starter
1. List 3 examples of Monitors
2. What input device controls the pointer on a laptop?
3. Give 2 features you would use to compare printers
Aims of Lesson 2
Last Lesson Input/Output Devices
Today’s Lesson Features of Backing Storage Devices
Backing StorageMedia 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Floppy Disk Magnetic 1.44Mb Very low capacity – outdated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
Lesson Starter
1. What is the name of the Magnetic storage media that compresses files?
2. What is the difference between a DVD ROM, DVD-R and DVD-RW?
3. Suggest a suitable storage media to store a backup copy of Photographs from a wedding that is 16Gb
Aims of Lesson 3
Last Lesson
1. Input/Output Devices
2. Features of Backing Storage Devices
Today’s Lesson Functions of an Interface
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
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