Topic 1: Digital Data Flashcards
What is data?
Data is raw facts and figures which have no meaning or context
What is information?
Information is data that has been processed and given context and meaning
Is 62351 data or information?
Data
Is ‘Product number 62351’ data or information?
Information
In what format do computers store data?
Digital format
What values has a bit got?
0 or 1
What is the word given to a group of 8 bits?
a Byte
What is a nibble?
A nibble is four bits
1 Kilobyte (kB) is equal to…
1024 bytes
1 Megabyte (MB) is equal to…
1024 kilobytes
1 Gigabyte (GB) is equal to…
1024 megabytes
1 Terabyte (TB) is equal to…
1024 gigabytes
A brief description of numeric data type…
Integer Number: an integer can be a positive or negative whole number, which has no decimal or fractional parts.
Real Numbers: real numbers include whole numbers and numbers with decimal/fractional parts. Real numbers can be positive or negative.
A brief description of Date/Time data type…
This determines the way that the date or time appears when it is displayed or printed by a computer. For example: long date or short date.
A brief description of Character/String data type…
A character is a single letter or digit represented by codes from the character set, used by the computer.
A string is textual data in the form of a sequence of characters from the character set. This could be in the form of a word. A string will have a variable number of characters.
What is a pixel?
A pixel is the smallest unit of a digital image that can be displayed and edited on a computer screen.
What does the resolution of an image tell us?
The quality of an image
What effect would more pixels
Explian the term resolution when referring to a graphic [2]
The resolution is the number of pixels in a given area. The resolution is a measure of quality and the more pixels, the better the quality.
What are bitmap graphics made of?
a grid of pixels
How does a bitmap graphic store an image?
They store information about every single individual pixel, and since each pixel could have a different colour, this means that beacuse the computer has to store ecery pixel, the file size can be large.
What happens when you zoom into a bitmap graphic?
Pixelation can occur
What are vector-based graphics made of?
mathematical formula, lines and other shapes
What happens when you zoom into a vector-based graphic?
They do not lose image quality as they are not made up of pixels
