How computers work!

CPUS - RAMS - HDDS - What is it all about?


The Central Processing Unit (CPU) is responsible for carrying out all the calculations and operations for a computer, by performing the basic arithmetical, logical and input/output operations of the system. This program will take inputs from an input device, process the input in some way and output the results to an output device such as a printer. Speed at which it does these is measured in Gigahertz.


Random Access Memory (RAM) is where data currently in use in a computer system is stored. The more memory you have the more data and programs you can have open at any one time. It is generally located on the motherboard. This type of memory is volatile and all information that was stored in the RAM is lost when the computer is turned off. Volatile memory is temporary memory. It requires power to store this data. This capacity is measured in gigabytes.


The hard disk drive ( or backing storage ) of a computer system permanently stores data. It is used for storing and retrieving digital information using rapidly rotating disks called platters, coated with magnetic material.A HDD retains its information even when it is powered off. Capacity is measured in gigabytes. 1024 GB = 1TB