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Floppy Disk Magnetic 1.44Mb Very low capacity – outdated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