Units and data representation Flashcards
what is the smallest unit a computer can work with and what states can they be
A bit
1 (On) or 0 (Off)
What is 8 bits called and what is 4 bits called
A byte
A nibble
how much is 1000 bytes And how much is 1000 kilobytes
1 kilo byte
1 megabyte
How to remember the order of the bytes and how much of the previous unit is needed to move on to the next
Burger King Makes great toast pan (Byte,Kilo,Mega,Tera,Peta)
1000 units
What is Analogue data and give examples
Real life signal that can vary greatly in data examples include:
sound Pressure light temperature
What is digital data
Digital data is the data computers use that is made from analogue data
How would you convert to digital data from analogue and how would you convert back
Use a Analogue digital converter
Use a digital analogue converter
How to calculate how many music files (6MB) would fit on a 1 GB USB
1GB = 1,000 MB
1000/6 = 166
1666 files
How to Convert a Binary number to deanery
Add up all the On switches in each place value
How to convert binary to hex +Convert 10011010 into Hexadecimal
154
to convert a 8 bit number to deanery first you must separate it into nibbles then you must figure out the total amount in each nibble. Then simply write the number it equal to or if its higher than 9 use letters
9A
How is each place value represented in HEX
Power of 16
What are the 1st 4 Hex place values and what is 513 in HEX place values
65,535 4,096 256 16 1
2 1
How to Multiply/divide Binary Number By: 2,4,8
Multiply/divide 2 move binary place value by 1 left/right
Multiply/divide 3 move binary place value by 2 left/right
Multiply/divide 4 move binary place value by 3 left/right
What are the common Character sets
ASCII
Unicode
How many Bits Are ASCII and UNICODE and how much characters can they hold
7 Bits PC 128 characters
16 Bits PC over 65,000
What is The Denary number range for Capital and lowecase letters (ASCII)
65-90 - A-Z
97-122 a-z
How is Extended ASCII different from ASCII
8 BITS
256 characters including special characters like accents
What is Colour depth what is a 2 bit colour depth capable of
Tells Us the range of colour range available
4 colours
What is Resolution what is it recorded in how much pixels are in a Image with a DPI of 72
Resolution is the pixel density in an image
recorded in DPI (Dots per Inch)
72DPI=5184 pixels
What is Metadata and give examples
Metadata- Data about data
Resolution Bit depth date taken
location
How to estimate Image file size and what is the file size of a image with a height of 200 and width 400 and colour depth of 16
200 X 400 = 80,000 X 16 = 1,280,000 / 8 = 160,000 bits
160,000 / 1000 = 160 KB
How are sounds digitised and what is this unit called
ADC will capture a sound wave at regular time intervals Sample
What is a sample rate and what is it measured in
Sample rate (HZ) Number of samples per second
What is bit depth
Bit depth = Number of bits used per sample
