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stratification
stratification (Lat.,=made in layers), layered structure formed by the deposition of sedimentary rocks . Changes between strata are interpreted as the result of fluctuations in the intensity and persistence of the depositional agent, e.g., currents, wind, or waves, or in changes in the source of t...
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turbidity current
turbidity current Dense current in air, water, or other fluid caused by different amounts of matter in suspension. In the ocean, when sediment along the continental shelves breaks off and rushes down slope, the resulting turbidity current carves out submarine canyons and deposits distinctively bedd...
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direct current
direct current abbr. DC, a movement of electric charge across an arbitrarily defined surface in one direction only. See electricity ; generator .
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electricity
electricity class of phenomena arising from the existence of charge . The basic unit of charge is that on the proton or electron —the proton's charge is designated as positive while the electron's is negative. There are three basic systems of units used to measure electrical quantities, t...
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rectifier
rectifier component of an electric circuit used to change alternating current to direct current. Rectifiers are made in various forms, all operating on the principle that current passes through them freely in one direction but only slightly or not at all in the opposite direction. One early type of...
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commutator
commutator device used in an electric generator to convert the alternating current produced in the generator into direct current before the current is sent into an external circuit; it is basically a rotary switching device synchronized with the frequency of the alternating current. Commutators a...
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alternating current
alternating current abbr. AC, a flow of electric charge that undergoes periodic reverses in direction. In North America ordinary household current alternates at a frequency of 60 times per second. See electricity ; generator .
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electric current
electric current Movement of electric charges, usually the flow of electrons along a conductor or the movement of ions through an electrolyte. This is caused by freely moving particles usually charged by a mains supply or battery. Current (symbol I) flows from a positive to a negative terminal, alt...
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ampere
ampere , abbr. amp or A, basic unit of electric current. It is the fundamental electrical unit used with the mks system of units of the metric system . The ampere is officially defined as the current in a pair of equally long, parallel, straight wires 1 meter apart that produces a force of 0.0000...
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anode
anode , electrode through which current enters an electric device. In electrolysis , it is the positive electrode in the electrolytic cell.
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