Data Representation [1.1]
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How many bits and characters does ASCII Have?
7 Bits and 128 Characters.
How many bits and characters does extended ASCII Have?
8 Bits, 256 Characters
How many bits and characters does Unicode have?
16 Bits, 65536 Characters. Enough for every character.
What is a character set?
Binary Representation of all the different characters that the computer can recognise
What is a Bit?
Binary Digit
How many bits are in a nibble?
4 Bits
How many Bits are in a Byte?
8 Bits
How many bits are in a Kilobyte?
1000 Bits
How many Kilobytes in a Megabyte?
1000 Kilobytes
How many Megabytes in a Gigabyte?
1000 Gigabytes.
Why do Computers use Binary?
Computers are made of switches and transistors which only have two states, on or off which is the same as binary.
What are Bitmap images made up of?
Picture elements called pixels.
What is a Character set?
All of the letters, numbers and symbols that can be recognised by a Computer system.
What is a Pixel?
Smallest identifiable area of an image, each appearing as a square with a single colour.
What is Colour depth?
The colour depth is the number of bits allocated to each pixel which determines how many colours can be represented.
What is resolution?
Density of pixels within a given area.
What is metadata?
Data about data, type of image author width and height etc.