Using binary (Edexcel GCSE Computer Science): Flashcards

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Using binary
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Number system using only 1 and 0

Binary

Why computers use binary

Transistors can only be in two states: on (1) or off (0)

Electronic components in processors with two states (on/off)

Transistors

Smallest unit of data (single binary digit)

Bit

Group of 4 bits

Nibble

Group of 8 bits

Byte

Formula for combinations with nn bits

2n2^n

Combinations possible with 2 bits

22=42^2 = 4

Combinations possible with 3 bits

23=82^3 = 8

Combinations possible with 4 bits

24=162^4 = 16

Different colours with 8 bits

28=2562^8 = 256 colours

Binary place values use powers of...

2 (powers of 2)

Moving left in binary, each position's value...

Doubles (has double the value)

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