Representing data

HideShow resource information
• Created by: becky.65
• Created on: 31-05-16 12:35
Define bit
Each digit of a binary number
1 of 20
Define nibble
Half a byte or 4 bits
2 of 20
Define byte
A group of 8 binary digits
3 of 20
Define kilobyte
1024 bytes
4 of 20
Define megabyte
1024 kilobytes
5 of 20
Define gigabyte
1024 megabytes
6 of 20
Define terabyte
1024 gigabytes
7 of 20
Why do programmers use hexadecimal?
Because large binary numbers are difficult to remember and hexadecimal numbers are easy to recognise and remember
8 of 20
What is the character set for the computer?
The list of codes and matching characters for the computer
9 of 20
What is ASCII code?
It uses 7 bits so can provide 127 characters plus the null character
10 of 20
What is extended ASCII?
It uses 8 bits, making it possible to use 256 characters in total
11 of 20
What is Unicode?
It uses 16 bits, providing over 65000 possibilities or 32 bits providing over 4 billion possibilities
12 of 20
Why might unicode be used?
It can provide a character set for a computer that includes a wide range of specialist symbols
13 of 20
Why does a computer need metadata for an image?
Because the computer is able to work out how to turn the binary values that the image is stored as into the image
14 of 20
What is a pixel?
One 'dot' of the image
15 of 20
What happens are the colour depth increases?
More bits per pixel are needed and more bits are needed to store the data
16 of 20
What is the resolution?
The number of pixels per unit
17 of 20
How are instructions coded as bit patterns?
The instruction is in two parts; the operator is the instruction part and the operand is the data part
18 of 20
What does the operator binary code represent?
An operation, e.g. ADD
19 of 20
How can the CPU tell the difference between data and instructions?
It cannot tell the difference and it simply deals with what it finds according to what it expects to find
20 of 20

Other cards in this set

Card 2

Define nibble

Back

Half a byte or 4 bits

Define byte

Define kilobyte

Define megabyte

Comments

No comments have yet been made

Similar Computing resources:

See all Computing resources »See all Representing data resources »