How Computers Work
Computer systems have a CPU (central processing unit) at there core. This performs all the calculations, operations and tasks that need to be done while someone uses the computer. the speed of the CPU is normally measured in gigahertz. the companies that make CPU's include inter and AMD. in general, the higher the speed, the faster the computer system will run.
Another measure that affects computer performance is the amount of RAM (random access memory). this stores data that is currently in use - the more memory you have the more data and programs you can have open at any one time. a modern desktop PC will probably have about 1-8 gigabytes of RAN. memory that loses its data when the power is removed is known at volatile memory.
For permanent storage of data, most computers still have a hard disc drive of HDD. These work by magnetically storing binary cod onto a metal disc. A modern computer will probably had a hard disc drive that can store between 500MB - 1TB of data. there are 1024GB in 1TB.