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29 Cards in this Set

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Examples of Input devices
Keyboard, Mouse, Joystick, Digital Camera, Scanner, Magnetic Stripe reader, Microphone
Aim of Input Devices
Put information on computer. Can be adapted so people with disabilities can use them.
Examples of Output Devices
Monitor (visual display unit), Printers(laser, inkjet, dot-matrix), Speakers, Control Devices(lights and buzzers)
Aim of Output Devices
Information off the computer. Can have a hard copy of the data.
Hard Disks:
Backing store. Large capacity. Items can be stored there when you switch off the computer.
Can crash - no computer. Fixed.
Floppy Disk
about 2mb storage. Used to store + transfer data. Used to make backups. Used as additional storage. Old. Small capacity
CD-ROM / DVD
Used for encyclopaedia/resources
Can be transported. Good sound and picture quality. Can't be rewritten.
Magnetic Tape
huge storage capacity- used to back up large volumes of data. Takes time to access specific point as you have to trawl through it
Flash Memory (usb) stick
Large Storage capacity. Can easily transfer data (files, pics and music) computer to computer.
RAM and ROM
Random access memorry - volatile; once gone its gone.
Read Only Memory - cannot be changes, used in bios
Why Do We Make Backups?
Hard Disk Failure, Virus Infection, Lost usb/floppy disk, computer network failure, human error.
Communication Devices:
fax/phone/email/letter - share information/files/pics anywhere in the world.
Types of data:
Text: abc?![£ Numeric: 123 Date/Time: 20/01/2012 Boolean: TRUE or FALSE
Data Keywords:
field: e.g. date of birth or surname
record: group of fields
Key field: unique key/number for individual people.
Software:
Something that doesn't physically exist - viewed on computer- makes it work e.g.microsoft word / Adobe Photoshop
Hardware:
Something you can touch e.g. keyboard / cpu / monitor
licenses
single user (1 person)
multi user (few people e.g. family)
site (e.g. school)
Piracy
Illegal: sharing, lending, using something without permission.
e.g.music, pictures, software
can get away with it (pics) if its for an educational non profit use.
Computers in Everyday Lives
credit cards, computerised statement letters, monitoring availability + cost of an item, ATM's can be misused
Internet
Internet: international collection of computers connected by communication lines using internet service providers (isp's)
World Wide Web
A collection of pages capable of being accessed over the internet with links to other pages
URL:
HTML:
Uniform Resource Locator
(http://www.bbc.co.uk)
Hyper marked Text Language
Virus'
Attatches itself to another program/file, can cause damage to programs + files, spread: email, websites, downloads
Magnetic Ink Character Recognition (micr)
cheques - checks sort code and process cheques. very expensive equipment
Optical Mark Reader (OMR)
lottery tickets: make a choice and computer easily and quickly recognises this. Very accurate + quick, badly damaged files can't be used
Optical Character Reader (OCR)
Like a scanner but instead of an image you get characters which can be transferred to word doc. Get computerised copy. Can't always recognise characters.
Bar Code Reader
Fast way to input data. Used in shops. Very expensive to use.
CD-R and CD-RW
(CD recordable and CD rewritable)
CD-R can be written on once
CD-RW can be written on and deleted off as many times as you like.
Computer Aided Learning (Cal)
e.g. powerpoints, videos Can use wide range of media. Student can electronically access and hand in work. Interesting. Expensive. Less personal