How computers work

The fourth generation of computers

What is a hard drive

A hard drive is the computers main storage device that permanently saves all the data in the computer. The hard drive was first made on September 13, 1956.

Optical drive

An optical drive is where you put the CD in and the computer process the data on the drive /disk.


The monitor is the screen in the PC where videos and data are displayed.


The CPU (Central Processing Unit) is the part of a computer system that is commonly called the “brains" of a computer. The CPU is also known as the processor or microprocessor. The CPU is responsible for executing a sequence of stored instructions called a program.


Random-access memory is a form of computer data storage. A random-access memory device allows data items to be read and written in roughly the same amount of time regardless of the order in which data items are accessed


The motherboard is a circuit board that is the foundation of a computer; it is at the bottom of the computer case. It locates power to the CPU, RAM, and all other computer hardware components and makes them communicate with one another.


input/output describes any operation, program, or device that takes data to or from a computer. Typical input/output devices are printers, hard disks, keyboards, and mouse’s. In fact, some devices are basically input-only devices (keyboards and mouse’s); others are output-only devices like printers; and others have both input and output of data (hard disks, writable CD-ROMs).


A touchscreen is a screen which allows people to interact with their finger to give command to the device.


software’s is the program which the computer runs one for example HP runs on the windows software and MAC runs on the IOS software.

the four generations of computers

1) the first generation (1995-1996) :

the computer was big and made out og vaccum tubes

2) the second generation (1959 - 1964 )

the transistor is smaller and faster and more reliable

3) the third generation

it has real time operating system and multiprogramming and database management.

4) the fourth generation (1971 - present)

contains entire central processing unit on a silicone chip

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