1.3 Data capacity Flashcards
what are the units of storage from smallest to biggest?
bit nibble byte KB MB GB PB
how big is a bit?
1 bit
how big is a nibble?
4 bits
how big is a byte?
8 bits
how big is a KB?
1024 bytes
how big is a MB?
1024 KBs
how big is a GB?
1024 MBs
how big is a PB?
1024 GBs
how big is a character in any text?
1 byte
e.g. 100 characters = 800 bits = 100 bytes
when working out the size of a file what must be added?
+10% for headers ad other extra stuff like colours
how to work out what a number of bits are in a KB?
no in bits/8=no in bytes
no in bytes/1024= no in KB
how does the bit size of a picture relate to how many colours it has?
the number of colours it has will be 2 to the power of its bit size
e.g.
16 bit = 2^ 16 = 65536
how to workout how many bits a picture is made of?
its bit size X the area in pixels
how big is a pixel?
1 byte
