Topic 2 Data Representation (1.2.3-1.2.5)
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Why is binary used in computer systems?
computers use electronic components like transistors which can be either on (1) or off (0) which is represented by a 1 and a 0
Give the order of the units of data storage from largest to smallest
• bit (b) • nibble • byte (B) • kilobyte (KB) • megabyte (MB) • gigabyte (GB) • terabyte (TB) • petabyte (PB)
What is the symbol for a bit?
b
How many bits are in a bit?
1 bit
What is the symbol for a nibble?
no standard symbol
How many bits are in a nibble?
4 bits
What is the symbol for a byte?
B
How many bits are in a byte?
8 bits
What is the symbol for a kilobyte?
KB
How many bytes are in a kilobyte?
1000 bytes
What is the symbol for a megabyte?
MB
How many kilobytes are in a megabyte?
1000 KB
What is the symbol for a gigabyte?
GB
How many megabytes are in a gigabyte?
1000 MB
What is the symbol for a terabyte?
TB
How many gigabytes are in a terabyte?
1000 GB
What is the symbol for a petabyte?
PB
How many terabytes are in a petabyte?
1000 TB
How do you calculate sound file size?
sample rate (hz) x duration (s) x bit depth (bits)
How do you calculate an image file size?
colour depth (bits) × image height (px) × image width (px)
How do you calculate a text file size?
bits per character × number of characters
What is the bits per character based on (in a text file)?
the character encoding system used, eg ASCII or Unicode
When calculating the size of a text file, should you include the spaces with the number of characters?
yeah
What is the range of an 8-bit binary number?
00000000 – 11111111