Topic 3 Flashcards

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What is Binary?
Binary is the smallest unit of data that we can store is called a binary digit, or a bit for short.
The value of a bit can be either a 0 or a 1.
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How do we measure these units?
We measure these units because a bit is so small, we do not usually use it to measure data.
Instead, we group bits into larger groups such as:
Nibble (4 bits).
Byte (8 bits).
Some more common units are:
Kilobyte (KB) (1000 bytes).
Megabyte (MB) (1000 KB).
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How to work out if you have enough capacity?
To find out if we have enough capacity, it is important to put the capacity of the media and the size of the data into the same units.

The more capacity available, the more data we can store.
The bigger the size of the data being stored, the bigger capac
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What is Denary?
In everyday life, we use a denary number system.
We use 10 symbols to represent each digit.
Each digit's place value is multiplied by 10 as we move from right to left.
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What is Hexadecimal?
Hexadecimal uses 16 different symbols for each place.
Hexadecimal uses the digits 0-9 then A-F:
A = 10 in denary, B = 11 ...
Each digit's place value is multiplied by 16 as we move from right to left.
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Converting Binary to Hexadecimal
Binary can be converted to hexadecimal by grouping into groups of 4 bits:
Start grouping from the right-hand side.
Convert each 4 bit group separately.
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Converting Hexadecimal to Binary
Hexadecimal can be converted to binary by splitting each digit into 4 bits:
Separately convert each hexadecimal digit into 4 bits of binary.
Put all of the 4 bit groups together.
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Converting Denary to Hexadecimal
The easiest method to convert denary numbers to hexadecimal is to first convert the denary to binary, and then use the binary to hexadecimal conversion algorithm.
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Converting Hexadecimal to Denary
Write out the powers of 16 above each hexadecimal digit.
For each place column, multiply the hexadecimal digit by the power of 16 above it.
Add together all of these results.
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Other cards in this set

Card 2

Front

How do we measure these units?

Back

We measure these units because a bit is so small, we do not usually use it to measure data.
Instead, we group bits into larger groups such as:
Nibble (4 bits).
Byte (8 bits).
Some more common units are:
Kilobyte (KB) (1000 bytes).
Megabyte (MB) (1000 KB).

Card 3

Front

How to work out if you have enough capacity?

Back

Preview of the front of card 3

Card 4

Front

What is Denary?

Back

Preview of the front of card 4

Card 5

Front

What is Hexadecimal?

Back

Preview of the front of card 5
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