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768343
Units, Numbers and Characters - Computing
Descrição
Computing
Sem etiquetas
gcse
computing
binary
units
numbers
denary
analogue
digital
data
byte
Mapa Mental por
izzykersley01
, atualizado more than 1 year ago
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Criado por
izzykersley01
mais de 10 anos atrás
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Resumo de Recurso
Units, Numbers and Characters - Computing
UNITS
BIT - smallest unit of data, represented as a binary number, either 1 (true) or 0 (false)
BYTE - contains 8 bits, one keyboard character takes up 1 byte of storage
NIBBLE - 4 bits, 2 make a byte, less common
KILOBYTE - unit of storage capacity, 1024 bytes (or 1000), equivalent to 1024 characters on screen
The more detailed an image, the more kilobytes of storage it takes up
MEGABYTE - unit of storage capacity, 1,048,576 bytes or 1,024 kilobytes (or 1 million bytes/1000 kilobytes)
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.
GIGABYTE - 1024 megabytes, a DVD can store a film around 4-8 gigabytes and hard disks can hold typically 160+ gigabytes
TERABYTE - 1024 gigabytes, can store huge amounts of data
ANALOGUE DATA - on a continuous scale, used in the real world
Computers can only deal with digital data (0 or 1). Analogue data must be converted to digital using an ADC
NUMBERS
Denary number system: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
'Base 10' number system
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)
Binary: 0 or 1
'Base 2' number system
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
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