CT term 1 Flashcards
Examples of output devices
monitor
printer
speakers
headphones
projector
touch screen
postersize
To print or display using only a handful of different tones. Adjust; a slightly crude image
bit
A contraction of “Binary Digit”. A bit is the single unit of information in a computer, typically represented as a 0 or 1.
computer
A programable electronic device the stores, retrieves and processes data.
examples of computers
laptop
mobile phone
smart watch
games console
washing machine
pace maker
example of imput devices
keyboard
mouse
microphone
games controller
touch screen
web cam
scanner
graphics tablet
barcode reader
pixel
Short for “picture element” it is the fundamental unit of a digital image, typically a tiny square or dot which contains a single point of color of a larger image.
Order of file sizes
nibble
byte
kilobyte
megabyte
gigabyte
terabyte
What is ASCII?
A binary number representing every letter, number and symbol.
a nimble
4 bits
byte
a group of 8 bits
16 bytes
smiley face
How to add binary numbers?
Just like denary numbers (normal number) except instead of ten the number is multiple of two.
Grey scale display
Displays black, white, and shades of gray
capture
to catch, a capta, captura
retouch
To modify the details of an image
air brush
to alter an image using specialized software to conceal imperfections
inherit
existing in something as a permanent, essential, or characteristic attribute
jiggery-pokery
underhanded manipulations or dealings; trickery; dishonest behaviour
built-in
forming an integral part of a structure or device, inherent
hefty
heavy; big and strong, muscular; of considerable size or amount; robus, puternic, viguros
tunnel vision
1 : constriction of the visual field resulting in loss of peripheral vision.
2 : extreme narrowness of viewpoint : narrow-mindedness also : single-minded concentration on one objective.
Dithering
A process that makes the transition between shades smoother
desktop
on your desk
Why is a desktop better?
more powerful
laptop
same parts as a desktop
smaller than desktop
hard to update
mobile/ easy to move
tablet
even less parts
really small
slow processing
easy to move/ mobile
less memory
Network card
Allows computers to access networks
Wirelessly
Through an ethernet cable
Motherboard
backboard
connects everything
green thing at the back
Case/ outside
body
CPU
Central Processing Unit
Fetches, decodes and executes code.
represents brain
needs to be kept cool
communicates and controls other parts of the computer
SSC
Faster and more efficient than a hard drive.
What happens when a device overheats?
stop working
heat up if too much
heatsink
takes heat from the computer
goes to fan
circulates air
little radiator
RAM
Random Access Memory
Short term memory
in laptop, but smaller than in desktops
2.38GHz=gigabits per minute
Turning it back on means you have to retrieve it from there
Temporary storage data
Serves as computer’s working memory
Graphics card
good for gamers
expansion card
generates output images on a display device
Power supply unit(PSU)
Power Unit
feeds power to device
can’t run power to PC- would blow
Converts high voltage Alternating current (AC) to low voltage Direct currtent (DC) this i
solid state drive
electronic
no moving parts
SSCs
some look like cartriges
invented in 1978
magnetic tape storage
invened by J. Presper Eckert and John Mauchly
created in 1952
hard drive
If you open up a hard drive is like a record player
invented by Reynold. B. Johnson
in 1965
data storage device
usually internally stored
uses magnetic storage to store and retrieve data
has rapidly rotating disks
disks coated in magnetic materials
disc spins
stick magnetically reads data
retains the data even when the device is switched off
punch card
created by Sony Philips in 1980 or 1994
Blue-ray
named after the blue laser used to read the discs in 2000
Cloud Storge
invented by Dr. Joseph Carl Robnett Licklider in the 1960s
kilobyte
1024 bytes
KB
Megabyte
1073741824 bytes
MB
metabytes
a set of data that describes and gives information about other data.
Examples of metadata
size=x by y
colour=what colours are in the picture
date= what date it was taken
time= what time it was taken
sound
faster than the tides
sampling
collection data
music sampling rate
44,100 samples a second
music sampling
piece of audio from the smallest possible singular measurement of an amplitude stored on a computer up to the largest file a computer can hold
longer samples
single sample of a wave form
network
a group of two of more computer systems linked together
LAN
Local Area Network
WAN
Wide Area Network
internet
A global network connecting millions of computers, making it possible to exchange information.
What is a bitmap?
Representation of an image
tiny blocks of colour
capturing sounds
Capture and log sounds
sample then store in binary
Network
Group of two or more connected devices
What are the types of networks
Local Area Network= LAN
Wide Area network= WAN
= example of WAN
=Internet
What is a server?
A computer providing resources and/ or services.
What is a network switch?
Connects devices together
Directs data around the network
What is a Router?
Device which allows wireless connection to a network.
What is eathernet cable?
Used to connect network hardware together.
What is a firewall?
A piece of software.
Stops unwanted connections to your network.
What is a data incription?
A method of changing the original characters in a message.
It hides or discusses the message.
What is an anti-virus software?
Designed to detect and stop attacks from malware.
What is the reason for secure passwords?
It is important for network security.
Prevent others from accessing your data
What to remember when creating a password?
A combination of
small letters
capital letters
numbers
symbols
more digits, more secure
