Computer Science - Data Unit

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What are the different data types?
Picture, Number, Boolean, Date/Time, Text
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What are the data sizes from smallest to largest?
Bit, Nibble, Byte, Kilobyte, Megabyte, Gigabyte, Terabyte
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What information can be stored in a bit?
Male or Female/ Yes or No
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What information can be stored in a byte?
A letter on a keyboard
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What information can be stored in a Kilobyte?
A paragraph of text
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What information can be stored in a Megabyte?
A song/ detailed picture
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What information can be stored in a Gigabyte?
a tv programme
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What information can be stored in a Terabyte?
200 hours of high quality film
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How is a picture stored?
Computers are digital, they can only handle binary numbers. So if an image is to be handled by a computer, the analogue image has to be converted into a set of binary numbers. i.e you 'digitise' an image with some imput device
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What is lossless compression?
In lossless compression when the file is compressed, it would be an exact copy of the original and wouldn't loose any detail at all.
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What is lossy compression?
In lossy compression, when the file is compressed, it would look exactly the same but it would loose some detail.
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What is a pixel?
A pixel is short for Picture Element. Smallest individual dot that can be displayed on a computer monitor. Each pixel is given a colour and a brightness value.
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What is a bitmap?
File format for digital images. Made up of a large number of pixels.
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What does resolution mean?
Means how many lines, pixels or dots are present over a standard length.Length is usually inches or millimeters.
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Other cards in this set

Card 2

Front

What are the data sizes from smallest to largest?

Back

Bit, Nibble, Byte, Kilobyte, Megabyte, Gigabyte, Terabyte

Card 3

Front

What information can be stored in a bit?

Back

Preview of the front of card 3

Card 4

Front

What information can be stored in a byte?

Back

Preview of the front of card 4

Card 5

Front

What information can be stored in a Kilobyte?

Back

Preview of the front of card 5
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