2.6 Data representation Flashcards

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1
Q

What must all data processed by a computer be in?

A

binary format

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2
Q

computers and how binary works

A

a computer processor uses billions of transistors acting s switches, which only act on the binary states on and off

all data and instructions are represented by the binary digits 1 (on) and 0 (off)

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3
Q

representation of data using binary strings

A

to be processed, instructions and data are converted to binary strings

images and sounds must be digitised and other inputs send binary strings to the processor

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4
Q

units

A

one unit (a 1 or 0) is called a bit (short for binary digit)

4 bits = 1 nibble
8 bits = 1 byte
1000 bytes = kilobyte
1000 KB = megabyte
1000 MB = gigabyte
1000 GB = terabyte
1000 TB = petabyte
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5
Q

list of units in order

A
bit
nibble
byte
kilobyte
megabyte
gigabyte
terabyte
petabyte
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6
Q

number systems

A

binary system is base 2 and uses two digits

the denary/decimal system is base 10

hexadecimal system is base 16

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7
Q

place value of binary numbers

A

2[n] gives the amount of characters in a certain place

2[7] = 128

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8
Q

An image file has a size of 57 600 000 bits.

Express this in megabytes. You may use the decimal prefix 1000 in your calculation [2]

A

57 600 000 bits / 8 = 7 200 000 bytes

7 200 000 / 1000 = 7200 kilobytes

7200 / 1000 = 7.2 MB

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9
Q

Showing your working, express 1 petabyte in bits.

You may use the decimal prefix 1000 in your answer [2]

A

8 000 000 000 000 000 bits

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