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an L.E.D. is a semiconductor device that emits visible light when an electric current passes through it.

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Like light-emitting diode (LED) and gas-plasma technologies, LCDs allow displays to be much thinner than cathode ray tube (CRT) technology. LCDs consume much less power than LED and gas-display displays because they work on the principle of blocking light rather than emitting it.

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The cathode ray tube (CRT) is a vacuum tube that contains one or more electron guns and a phosphorescent screen, and is used to display images. It modulates, accelerates, and deflects electron beam(s) onto the screen to create the images.

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-The invention of integrated circuit brought us the third generation of computers. With this invention computers became smaller, more powerful more reliable and they are able to run many different programs at the same time. In1980 Microsoft Disk Operating System (MS-Dos) was born and in 1981 IBM introduced the personal computer (PC) for home and office use. Three years later Apple gave us the Macintosh computer with its icon driven interface and the 90s gave us Windows operating system.

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- This generation of computers used transistors instead of vacuum tubes which were more reliable. In 1951 the first computer for commercial use was introduced to the public. In 1953 the International Business Machine (IBM) 650 and 700 series computers made their mark in the computer world. Storage media such as tape and disk were in use also were printers for output.

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In 1937 the first electronic digital computer was built by Dr. John V. Atanasoff and Clifford Berry. It was called the Atanasoff-Berry Computer (ABC). In 1943 an electronic computer name the Colossus was built for the military. Other developments continued until in 1946 the first general– purpose digital computer,.

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First Generation, Second Generation and Third Generation

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A very large and expensive computer capable of supporting hundreds, or even thousands, of users simultaneously. In some ways, mainframes are more powerful than supercomputers because they support more simultaneous programs. But supercomputers can execute a single program faster than a mainframe.

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A computer that performs calculations and logical operations with quantities represented as digits, usually in the binary number system

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The Z1 (the first programmable computer) was created by German Konrad Zuse

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It was made in the 19th century.
between 1936 and 1938.

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To store Data

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A computer monitor is a display adapter that displays information processed by the computer's video card.

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An analog computer is a form of computer that uses continuous physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved.

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is used to enter characters and functions into the computer system by pressing buttons, or keys.

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It allows the user to select items stored on a computer and, subsequently, perform actions on those items.

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COMPUTER