Category Archives: Computer

Vacuum tube

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A vacuum tube (also called a VT or electron tube ) is a device sometimes used to amplify electronic signals.Vacuum tube was first developed by John Ambrose Fleming in 1904.Vacuum tubes mostly rely on thermionic emission of electrons from a … Continue reading

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Noise

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Noise is a third impairment. It can be define as an unwanted energy from sources other than the transmitter. Thermal noise is caused by the random motion of the electrons in a wire and is unavoidable. In communication systems too, … Continue reading

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What are Optical Fibres ?

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An optical fibre is a cable made up of super-thin filaments of extruded glass (silica) or other transparent materials that is able to carry beams of light. This super-thin glass filament functions as a wave-guide, or “light pipe“. Optical fibres … Continue reading

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Some Common Shortcuts while Working on a Windows OS

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Have you ever tried shortcut keys to do common tasks on a Windows OS pc. If not, try these keys and explore for your self… Press this key To do this F1 Display Help Ctrl+C Copy the selected item Ctrl+X … Continue reading

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X-ray Imaging

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X-rays are among the oldest sources of Electro Magnetic radiation used for imaging. The best known use of X-rays is medical diagnostics, but they are also used extensively in industry and other areas like astronomy. X-rays for medical and industrial … Continue reading

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Different Types of Computer

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Computers are classified on the basis of size and function. On the basis of size of computer there are four types that are Microcomputers: Desktop computers, laptops, tablets, smart phones are the well known type of microcomputers. It is also … Continue reading

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What is IP Address

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You must have heard of the term “IP address” but most of us may not know exactly what it is, just a shadowy picture of it in our mind, unless you are a techie. An IP address is a technology … Continue reading

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Virtual memory

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Virtual memory refers to the technology in which some space in hard disk is used as an extension of main memory so that a user program need not worry if its size extends the size of the main memory. If … Continue reading

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Semiconductor Devices

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Semiconductor devices are electronic components that exploit the electronic properties of semiconductor materials, principally silicon, germanium, and gallium arsenide, as well as organic semiconductors. Semiconductor devices have replaced thermionic devices (vacuum tubes) in most applications. They use electronic conduction in the solid state as opposed to the gaseous state or thermionic emission in a high vacuum. Semiconductor devices are manufactured both … Continue reading

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History of Computers

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Think how computers today we handle were invented… What was the first computer and why it was invented? The First computer was invented during World War II to break signal codes of German Army. The computers were as big as … Continue reading

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