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English Wikipedia references for Du.edu 21-40 of 382
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| Turbine ight)where Turbine | |
| Transformer By appropriate selection of the ratio of turns, a transformer thus allows an alternating current (AC) voltage to be "stepped up" by making NS greater than NP, or "stepped down" by making NS less than NP. Transformer | |
| Wake Island Wake Island (also known as Wake Atoll, ) is a coral atoll having a coastline of 12 miles (19 kilometers) in the North Pacific Ocean, located about two-thirds of the way from Honolulu (2,300 statute miles or 3,700 km west) to Guam (1,510 miles or 2,430 km east). Wake_Island | |
| Water turbine A water turbine is a rotary engine that takes energy from moving water.Water turbines were developed in the nineteenth century and were widely used for industrial power prior to electrical grids. Now they are mostly used for electric power generation. They harness a clean and renewable energy source. Water_turbine | |
| Magnetohydrodynamics Magnetohydrodynamics (MHD) (magnetofluiddynamics or hydromagnetics) is the academic discipline which studies the dynamics of electrically conducting fluids. Examples of such fluids include plasmas, liquid metals, and salt water. The word magnetohydrodynamics (MHD) is derived from magneto- meaning magnetic field, and hydro- meaning liquid, and -dynamics meaning movement. The field of MHD was initiated by Hannes Alfvén, for which he received the Nobel Prize in Physics in 1970. Magnetohydrodynamics | |
| Ground (electricity) In electrical engineering, ground or earth may be the reference point in an electrical circuit from which other voltages are measured, or a common return path for electric current, or a direct physical connection to the Earth. Ground_(electricity) | |
| Sandra Day O'Connor Sandra Day O'Connor (born March 26, 1930) is an American jurist and was the first female Justice of the Supreme Court of the United States. She served as a Supreme Court Justice from 1981 until her retirement from the Court in 2006. O'Connor was appointed by Republican President Ronald Reagan in 1981. Sandra_Day_O'Connor | |
| Violence Violence is the expression of physical force against self or other, compelling action against one's will on pain of being hurt. Variant uses of the term refer to the destruction of non-living objects (see property damage). Worldwide, violence is used as a tool of manipulation and also is an area of concern for law and culture who take attempts to suppress and stop it. Violence | |
| Astronomy Astronomy (from the Greek words astron (ἄστρον), "star", and nomos (νόμος), "law") is the scientific study of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earth's atmosphere (such as the cosmic background radiation). It is concerned with the evolution, physics, chemistry, meteorology, and motion of celestial objects, as well as the formation and development of the universe. Astronomy | |
| Reconstruction era of the United States The Reconstruction Era is the common name for the period in United States history covering the post-Civil War era in the entire United States between 1865 and 1877. "Reconstruction" is a term that refers to the policies implemented between 1863 and 1877 when the nation was focused on winning the Civil War, abolishing slavery, defeating the Confederacy, and reconstructing the nation and the Constitution. Reconstruction_era_of_the_United_States | |
| Telephone exchange In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central office is the physical building used to house inside plant equipment including telephone switches, which make telephone calls "work" in the sense of making connections and relaying the speech information.The term exchange can also be used to refer to an area served by a particular switch (typically known as a wire center in the US telecommunications industry). Telephone_exchange | |
| Telephone exchange Talk:Telephone_exchange | |
| Match match is a consumable tool for lighting a fire in controlled circumstances on demand. Matches are readily available, being sold by tobacconists and many other kinds of shops. Matches are rarely sold singly; they are sold in multiples, packaged in match boxes or matchbooks. Match | |
| Bernoulli's principle In fluid dynamics, Bernoulli's principle states that for an inviscid flow, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy. Bernoulli's principle is named after the Dutch–Swiss mathematician Daniel Bernoulli who published his principle in his book Hydrodynamica in 1738. Bernoulli's_principle | |
| Surface weather analysis Surface weather analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground-based weather stations. Weather maps are created by plotting or tracing the values of relevant quantities such as sea level pressure, temperature, and cloud cover onto a geographical map to help find synoptic scale features such as weather fronts. Surface_weather_analysis | |
| Maximum power theorem electrical engineering, the maximum power (transfer) theorem states that, to obtain maximum external power from a source with a finite internal resistance, the resistance of the load must be made the same as that of the source. It is claimed that Moritz von Jacobi was first to discover the maximum power (transfer) theorem which is referred to as "Jacobi's law".The theorem applies to maximum power, and not maximum efficiency. Maximum_power_theorem | |
| Legendre polynomials Noteassociated Legendre polynomials as simply Legendre polynomials.In mathematics, Legendre functions are solutions to Legendre's differential equation: Legendre_polynomials | |
| Celestial mechanics Celestial mechanics is the branch of astronomy that deals with the motions of celestial objects. The field applies principles of physics, historically classical mechanics, to astronomical objects such as stars and planets to produce ephemeris data. Orbital mechanics (astrodynamics) is a subfield which focuses on the orbits of artificial satellites. Celestial_mechanics | |
| Law of sines ,where S is the area of the triangle and s is the semiperimeter Law_of_sines | |
| Surface tension For the work of fiction, see Surface Tension (short story).Surface tension is an attractive property of the surface of a liquid. It is what causes the surface portion of liquid to be attracted to another surface, such as that of another portion of liquid (as in connecting bits of water or as in a drop of mercury that forms a cohesive ball).Applying Newtonian physics to the forces that arise due to surface tension accurately predicts many liquid behaviors that are so commonplace that most people take them for granted. Surface_tension |
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