Slides in this set
Data & Information
Data is facts, values, scores and measurements which
have no meaning by themselves.
When data is processed by a computer system and
given meaning, it becomes information...
180 My height is 180cm
Data + Meaning = Information…read more
There are three main types of computer system...
Information Systems which collect,
process and store data, e.g. banking
Control Systems which control
a piece of equipment, such as
the temperature in a greenhouse
or the arm of a robot.
Communication Systems which
transfer data between computers
and communication devices, e.g.
mobile phone systems.…read more
Computer systems are made up of hardware and
A computer system takes in data as input, processes
it in the CPU, and gives it back to the user as output.
Whilst a computer system is processing data, it uses
primary memory or main memory (RAM).
A computer system also has backing store or
secondary memory to store data permanently. The
Hard Disk Drive…read more
Most computer systems use feedback.
Feedback is where information from the output
becomes part of the input.
Feedback enables a
system to adjust, e.g. a
central heating system.
The thermostat gives feedback
to the central heating system
to control the temperature.
A computer system that utilises feedback is called a
closed loop system.…read more