gap current pulse
81Gramophone record — A 12 inch (30 cm) 33⅓ rpm record (left), a 7 inch 45 rpm record (right), and a CD (above) A gramophone record, commonly known as a phonograph record (in American English), vinyl record (in reference to vinyl, the material most commonly used after …
82Optics — For the book by Sir Isaac Newton, see Opticks. Optical redirects here. For the musical artist, see Optical (artist). Optics includes study of dispersion of light. Optics is the branch of …
83Surge protector — A surge protector is an appliance designed to protect electrical devices from voltage spikes. A surge protector attempts to regulate the voltage supplied to an electric device by either blocking or by shorting to ground voltages above a safe… …
84nuclear weapon — an explosive device whose destructive potential derives from the release of energy that accompanies the splitting or combining of atomic nuclei. [1945 50] * * * or atomic weapon or thermonuclear weapon Bomb or other warhead that derives its force …
85F-14 Tomcat — infobox Aircraft name= F 14 Tomcat caption= An F 14A Tomcat from the USS Nimitz during Operation Southern Watch type= Interceptor/multi role Fighter aircraft manufacturer= Grumman Northrop Grumman first flight= 21 December 1970 introduction=… …
86Opto-isolator — This article is about the electronic component. For the optical component, see optical isolator. Schematic diagram of an opto isolator showing source of light (LED) on the left, dielectric barrier in the center, and sensor (phototransistor) on… …
87Magnetic bearing — A magnetic bearing A magnetic bearing is a bearing which supports a load using magnetic levitation. Magnetic bearings support moving machinery without physical contact, for example, they can levitate a rotating shaft and permit relative motion… …
88Overvoltage — This article is about a concept in electrical engineering. For use in electrochemistry, see overpotential. Voltage spike. When the voltage in a circuit or part of it is raised above its upper design limit, this is known as overvoltage. The… …
89Plasma (physics) — For other uses, see Plasma. Plasma lamp, illustrating some of the more complex phenomena of a plasma, including filamentation. The colors are a result of relaxation of electrons in excited states to lower energy states after they have recombined… …
90Bethlehem, Pennsylvania —   City   Downtown Bethlehem in 2007 …
