What is a bit
0 or 1
What is nibble
4 bits
What is a byte
8 bits
How many base is denary(decimal’
Base 10
How many bases is hexadecimal
Base 16
What does binary shift to the left do
Multiply by 2 each time
What does binary shift to the right do
Divide by 2 each time
What is a character set
A defined list of characters that are recognised and can be stored in a computer system
What is ascii
7 bits per character to Arles 128 characters
What is extended ascii
8 bits instead to allow more characters to be represented
What are the capital letters in ascii
65-90
What are lower case letters in ascii
97-122
What is Unicode
16 bits per character, enough to represents characters in most languages and emojis. Uses same code as ascii up to 127
What is a pixel (picture element)
The smallest part of an image
What is the image size
Width x height
What is colour depth or bit depth
The number of bits used to represent each pixel
What are bitmaps made of
Pixels
how does a higher bit depth and number of pixels
Increases the quality of the image but also increases the file size
What is resolution
The number of pixels in a defined area
What must be done to sound to store it and why
Sound is analogue so must be converted into a digital form to be stored and processed
What is a sample
The measure of amplitude at a point in time
What is sampling rate
The number of samples taken in a second and is measured in hz
What is the sample resolution
The number of bits per sample
How to calculate file size
Sample rate x sample resolution x time
