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A  rectifier  is an electrical device composed of one or more diodes that converts alternating current (AC) to direct current (DC). A diode is like a one-way valve that allows an electrical current to flow in only one direction. This process is called rectification. A rectifier can take the shape of several different physical forms such as solid-state diodes, vacuum tube diodes, mercury arc valves, silicon-controlled rectifiers and various other silicon-based semiconductor switches. Rectifiers are used in various devices, including: DC power supplies Radio signals or detectors A source of power instead of generating current High-voltage direct current power transmission systems Several household appliances use power rectifiers to create power, like notebooks or laptops, video game systems and televisions. What is a rectifier? When the voltage is applied to the P-N junction diode in such a way that the positive terminal of the battery is connected to t...

An amplifier is an electronic device that increases the voltage, current, or power of a signal. Amplifiers are used in wireless communications and broadcasting, and in audio equipment of all kinds.  Or Amplifier is device which increase the strength of signal. An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal. An amplifier functions by taking power from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In this sense, an amplifier modulates the output of the power supply based upon the properties of the input signal. An amplifier is effectively the opposite of an attenuator: while an amplifier provides gain, an attenuator provides loss. Amplifier is made up of transistors. before invention of the transistor vacuum tubes were used in amplifier. Classification of Amplifiers 1-Type of Signal ...

E.C.G. Sudarshan T he physicist Hans Bethe once said, “There are two types of genius. Ordinary geniuses do great things, but they leave you room to believe that you could do the same if only you worked hard enough. Then there are magicians, and you can have no idea how they do it.” In the world of science, every so often we come across visionaries, ‘magicians’ in the words of Bethe, who dare to perceive the world in ways no one else has before. E.C. George Sudarshan is one of them.  Born in Kottayam in 1931,   Ennackal Chandy George Sudarsan   studied at the CMS College and later at the Madras Christian College, the University of Madras and the Tata Institute of Fundamental Research. ECG (Ennackal Chandy George) Sudarsan had been nominated nine times for Nobel Prize in physics. Sudarsan rewrote Albert Einstein's theory through the discovery of Tachyon particles in quantum optics. Famous scientist Vaidyanath Misra was also with Sudarsan in his eff...