Units, Numbers and Characters - Computing

izzykersley01
Mind Map by , created over 5 years ago

Computing

130
3
0
izzykersley01
Created by izzykersley01 over 5 years ago
Binary
Mr A Esch
2.1.5 Databases
Lavington ICT
2.1.7 Programming
Lavington ICT
Vocabulário Inglês Básico
miminoma
Les Aliments
dAnn dAnn
2.1.4 Data Representation
Jake Youd
Binary quiz
Brodie McMeowface
STEM AND LEAF DIAGRAMS
Elliot O'Leary
GCSE Computing - 4 - Representation of data in computer systems
lilymate
2.1.4 Data Representation
Lavington ICT
Units, Numbers and Characters - Computing
1 UNITS
1.1 BIT - smallest unit of data, represented as a binary number, either 1 (true) or 0 (false)
1.2 BYTE - contains 8 bits, one keyboard character takes up 1 byte of storage
1.3 NIBBLE - 4 bits, 2 make a byte, less common
1.4 KILOBYTE - unit of storage capacity, 1024 bytes (or 1000), equivalent to 1024 characters on screen
1.4.1 The more detailed an image, the more kilobytes of storage it takes up
1.5 MEGABYTE - unit of storage capacity, 1,048,576 bytes or 1,024 kilobytes (or 1 million bytes/1000 kilobytes)
1.5.1 A typical MP3 song can be anywhere between 3 to 5 megabytes in size and a CD can store up to 650 megabytes of data.
1.6 GIGABYTE - 1024 megabytes, a DVD can store a film around 4-8 gigabytes and hard disks can hold typically 160+ gigabytes
1.7 TERABYTE - 1024 gigabytes, can store huge amounts of data
1.8 ANALOGUE DATA - on a continuous scale, used in the real world
1.8.1 Computers can only deal with digital data (0 or 1). Analogue data must be converted to digital using an ADC
2 NUMBERS
2.1 Denary number system: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
2.1.1 'Base 10' number system
2.1.1.1 Multiply each digit on the left by a progressive factor of 10 in order to calculate its value e.g. '123' = 3 + (10 * 2) + (100 * 1)
2.2 Binary: 0 or 1
2.2.1 'Base 2' number system
2.2.1.1 Multiply each digit on the left by a progressive factor of 2 e.g. '37' = 00100101 (1 * 1) + (2 * 0) + (4 * 1) + (8 * 0) + (16 * 0) + (32 * 1) = 37

Media attachments