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By Ancient Egyptian. Electric fish is a fish that can generate electric fields. It produce their electrical fields from a specialized structure called an electric organ. Typically this organ is located in the tail of the electric fish.
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By Thales of Miletus. Static electricity is an imbalance of electric changes whitin or on the surface of a material. The charge remains until it is able to move away by means of an electric current or electrical discharge.
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By Thomas Johann Seebeck. Thermoelectricity is the direct conversion of temperature differences to electric voltage and vice versa via a thermocouple.[1] Thermoelectric devices create a voltage when there is a different temperature on each side. Conversely, when a voltage is applied to it, heat is transferred from one side to the other, creating a temperature difference.
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By George Ohm. Electrical resistence is an object is a measure of its opposition to the flow of electric current. The inverse quantity is electrical conduce, and is the ease with which an electric current passes. Electrical resistence shares some conceptual parallels with the nation of mechanical friction.
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By Nicolas Callan. A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to one or more circuits. A varying current in any one coil of the transformer produces a varying magnetic flux, which, in turn, induces a varying electromotive force across any other coils wound around the same core. Electrical energy can be transferred between the (possibly many) coils, without a metallic connection between the two circuits.
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By Johann Philipp Reis. Colloquially named mic on mke is a device that converts sound into an electrical siganl. Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, motion picture production, live and recorded audio engineering and a lot of more differents exemples.
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By Wermer von Siemens. Loudspeaker is an electroacoustic transducer; adevice which converts an electrical audio signal into a corresponding sound
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By Joseph Swan. Is an electric light with a wire filament heated until it glows. The filaments is inclosed in a bulb to protect the filament from oxidation. Current is supplied to the filament by terminals or wires embadded in the glass. A bulb socket provides mechanizal support and electrical connections.
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By Thomas Alva Edison. Is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Fuses have been used as essential safety devices from the early days of electrical engineering. Today there are thousands of different fuse designs which have specific current and voltage ratings, breaking capacity and response times, depending on the application.
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By wihelm Röntgen. Make up x-radiation, a form of higgh-energy electromagnetic radiation. Most w-rays have a wavelength ranging from 0.03 to 3 nanometres. X-ray wavelengths are shorter than those of UV rays and tipically longer than those of gamma rays.
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By Guillermo Marconi. Is the technology of signding and communicating using radio waves. Radio is very widely used in modern technology, in radio communication, radar, remote control, remote sensing and other applications. In radio communications, used in radio and television broadcasting, cell phones, two-way radios, wireless networking and satellite comunication among numerous other uses.
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By Heike Kamerlingh Onnes. Superconductivity is the set of physical properties observed in certain materials, wherein electrical resistance vanishes anel from which magnetic flux fields are expelled. Any material exhibiting these properties is a superconductor.
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By Henri Abraham and Eugene Blach. Is an electronic circuit used to implement a variety of simple two-state devices such as relaxiation oscillators, times and flip-flops. It constants of two amplifying devices cross- coupled by resistors or capacitors. They called their circuit a "multivibrator" because its output waveform was rich in harmonics. There are the Astable multivibrator, the multivibrator and the bistable multivibrator.
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By Max Dieckman. Video cameras tubes were devices based on the cathode ray tube that were used to capture television images prior to the introduction of charge-coupled device image sensors in the 1980s.
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Firts wind plant in the Soviet Union. The wind energy is the use of wind to provide the mechanical power through wind turbines to turn electric generators and traditionally to do other work, like milling or pumping. Wind power is a sustainable and renovable compared to burning fossil fuels.
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By Paul Eisler. A PCB mechanically supports and electrically connects electrical or electronic components using conductive tracks, pads and other features etched from one or more sheet layers of copper laminated onto and/or between sheet layers of a non-conductive substrate. Printed circuit boards are used in all but the simplest electronic products. They are also used in some electrical products, such as passive switch boxes.
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By Dennis Gabor.A hologram is a physical structure that uses light diffraction to make an image;the image can appear to be three-dimensional. Holography is the science and practice of making holograms. Typically, a hologram is a photographic recording of a light field, rather than an image formed by a device without lens. The holographic medium, i.e., the object produced by a holographic process is usually unintelligible when viewed under diffuse ambient light.
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First nucear power plant in the US. Is a thermal power station in which the heat source is a nuclear reactor. As is typical of thermal power station, heat is used to generate steam that drives a steam turbine connected to a generator that produces lectricity.
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By Narinder Singh Kapany. An optical fiber is a flexible, transparent fiber made by drawing glass or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to transmit lightbetween the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data rates) than electrical cables.
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By Nick Holonyak Jr.. A light-emitting diode is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light is determined by the energy required for electrons to cross the band gap of the semiconductor. White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device.
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By Blaise Pacal. Electronic calculator is a typically a portable electronic device used to perform calculations, ranging from basic aritmetic to complex mathematics.
