# Computing - Representation of Data in Computer Systems

HideShow resource information
Denary
A system of numbers using 10 digits, 0-9
1 of 30
Binary
A system of numbers using two digits, 1 and 0
2 of 30
Bit
Binary digit 1 or 0
3 of 30
Byte
8 bits
4 of 30
Nibble
4 bits/half a byte
5 of 30
Kilobyte
1024 bytes
6 of 30
Megabyte
1024 kilobytes
7 of 30
Gigabyte
1024 megabytes
8 of 30
Terabyte
1024 gigabytes
9 of 30
What's the largest number that can be stored in a byte?
255
10 of 30
Overflow
When a number becomes too large to fit into the number of bits allocated it is said to 'overflow' meaning that some bits are lost and leave an incorrect value
11 of 30
Hexadecimal
The base-16 number system
12 of 30
ASCII
American Standard Code for Information Interchange. 7-bit system to code the character set of a computer
13 of 30
Character Set
The characters available to a computer
14 of 30
Unicode
Up to 32-bit system to code the character set of a computer
15 of 30
Pixel
The smallest element of an image. They're the dots that make the images on the screen.
16 of 30
Colour Depth
(or bit depth) The number of bits used for each pixel. The more bits the more colours that can be represented.
17 of 30
Resolution
The number of pixels per unit (ppi - pixesl per inch - is popular)
18 of 30
Metadata
Information about the image data that allows the computer to recreate the image from the binary data in the file. Must contain height & width of pixels and the colour depth in bpp (bits per pixel)
19 of 30
Analogue
Continuously changing values - like sound
20 of 30
Converting Sound from Analogue to Digital
Sample sound wave at set intervals, record the values, set of values is then saved and replayed by the computer
21 of 30
Sample Rate
The number of times the sound is sampled per second, measured in Hz. Affects the quality of sound. High sample rate = improved quality but creates larger file.
22 of 30
Bit rate
The space available for each sample, measured in kilobits per second. High bit rate = better results by needs more storage space
23 of 30
Address
Location in the main memory used to store data or instructions
24 of 30
Decode
Instruction is decoded by the CPU into two parts - operator and operand
25 of 30
Register
Special fast access part of the CPU that stores data in use by CPU
26 of 30
Program Counter
A register in the CPU that keeps the address of the next instruction
27 of 30
Operator
Part of the instruction that tells the CPU what to do
28 of 30
Operand
Part of the instruction that tells the CPU what to apply the operation to
29 of 30
Accumulator
Register in CPU that stores data currently being used by the CPU
30 of 30

## Other cards in this set

### Card 2

#### Front

A system of numbers using two digits, 1 and 0

Binary

### Card 3

#### Front

Binary digit 1 or 0

8 bits

### Card 5

#### Front

4 bits/half a byte

## Comments

No comments have yet been made

## Similar Computing resources:

See all Computing resources »See all Representing data resources »