Chapter 1 ✅ Flashcards
Data
Raw facts and figures with no meaning attached
Information
Data with meaning
Number system of which computers store data
Binary System
Smallest unit of storage, has a value of 0 or 1
Binary digIT (bit)
ASCII meaning
American Standard Code for Information Interchange
normal one
Integer Numbers
Numeric data type- a whole number which can be positive or negative
Real Numbers
Numeric data type- includes whole numbers (integers) as well as numbers with decimal and fraction parts.
day - month - number - year
Long Date
Date/ Time type- Saturday, April 1, 2018
Medium Date
Date/ Time type- 1 Apr 2018
Short Date
Date/ Time type- 01/04/2018
Long time
Date/ Time type- 13:26:34
Medium time
Date/ Time type- 01:26PM
Short time
Date/ Time type- 13:26
What is a character?
A single letter or digit represented by codes from the character set used by the computer (e.g. ASCII)
What is a string?
Textual data in the form of a sequence of characters from a character set.
k-m-g-t
Arrange in ascending order: a nibble, a megabyte, a byte, a terabyte, a kilobyte, a bit,
A nibble, a bit, a byte, a kilobyte, a megabyte, a gigabyte, a terabyte
What is a pixel?
The smallest unit of a digital image that can be displayed & edited on a computer screen.
What is image resolution and what about the amount of storage space it takes up (pixels)
Image resolution describe the quality of an image.
The greater the number of pixels used in an image, the higher the image resolution and the sharper the image.
However, higher resolution images require more storage space. Image resolution is represented by 2 numbers, e.g. 1280 x 720.
What are bitmap graphics?
made from
higher resolution =
storage+why
compressed?
what’s pixelation
- Made from a grid of pixels
- Higher resolution= Higher quality
- Take up a lot of storage space as bitmap graphics store details about every single pixels
- Can be compressed to reduce file size but this can result in loss of quality.
- Pixelation can occur when the bitmap image is enlarged too much
maths, e.g. C + S instead of
What are vector graphics?
- Images made from mathematical components, e.g. curves and shapes, instead of pixels
What is streaming?
A process which allows video to be viewed straight away, without having to wait for the full video to be downloaded.
What is a buffer?
An allocated part of memory that is used to store a downloaded part of a video before it is watched. When a user is watching a video, a buffer is used to download the next part.
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What is sample rate?
The number of audio sound samples captured every second to represent the sounds digitally
The more samples taken, the better quality audio.
measured in Hertz (Hz
What is sample rate?
The number of audio sound samples captured every second to represent the sounds digitally
more samples taken more accurate the sound is which results in better quality audio.
