digital technology Flashcards
what is a pixel?
made of 3 lights red, green, blue and have values of 0-255.
what is resolution?
how many pixels is on a screen, PPI.
how many different colours can be made with one pixel?
16,777,216.
how big is a TB?
1024 GB.
how big is a MB?
1024 kb.
how big is a nibble?
4 bits.
what is cloud storage?
files that are stored on a external sere and can be accessed with a internet connection.
what is a server?
a computer which manages access to a service on a networks.
what is connectivity?
how a device connects to a network.
what is the data protection act?
laws that control how your personal data is used.
what is hardware?
computer hardware includes the physical parts of a computer.
what is ram?
stores data currently being used by the computer.
what is rom?
stores data to boot up the computer.
what is secondary storage?
a type of non-volatile storage that allows data to be stored for long term.
what is tertiary storage?
a way of creating a duplicate copy of data at a secondary level.
what is volatile data?
when the computer is switched off, it loses all the data stored.
what is non-volatile data?
when the computer is switched off, it retains its data.
bit map images
made of pixels, takes up more space than vectors but is more detailed, not scalable, can edit each pixel and used for web pages.
vector images
made of mathematically defined objects and take up less space that bit maps, scalable but you can only edit each object, limited colour and they are used for logos.
lossy compression
reconstructs all the original data but this means data is lost, it is permanent, poor quality, smaller files sizes and JPG.
lossless compression
data is reconstructed, it is reversible, keeps its quality, larger file sizes and PNG are common file formats.
capacity
how much space is available
cost
how expensive is it per MB
durability
how resistant is it to damage
reliability
longevity-performance time
speed
how quickly the data can be read and transferred
sampling
when sound is recorded, samples are taken at regular intervals, the sample is in Hz
