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Liquid rheostats used as motor start switches, circa 1900. A liquid rheostat or water rheostat [1] or salt water rheostat is a type of variable resistor.This may be used as a dummy load or as a starting resistor for large slip ring motors.
Wire-wound rheostats made with ratings up to several thousand watts are used in applications such as DC motor drives, electric welding controls, or in the controls for generators. The rating of the rheostat is given with the full resistance value and the allowable power dissipation is proportional to the fraction of the total device resistance ...
The resistance value is determined by cutting a helix through the coating rather than by etching, similar to the way carbon resistors are made. The result is a reasonable tolerance (0.5%, 1%, or 2%) and a temperature coefficient that is generally between 50 and 100 ppm/K. [ 9 ] Metal film resistors possess good noise characteristics and low non ...
Fixed-value liquid resistors are typically used where very high power dissipation is required. They are used in the rotor circuits of large slip ring induction motors to control starting current, torque and to limit large electrical fault currents (while other protection systems operate to clear or isolate the fault).
Sonae Indústria is a manufacturer of engineered wood products, founded and headquartered in Maia, Portugal.Present in five countries within three continents, Sonae Indústria has a wide range of products, from simple board to complete construction systems, a large range of wood-based products and materials for furniture, construction and decoration.
UMM (Portuguese: União Metalo-Mecânica, pronounced [uniˈɐ̃w mɨˈtalu mɨˈkɐnikɐ]) is a Portuguese metal works factory and ex-automobile manufacturer based in Lisbon, Portugal. It was founded in 1977 with the purpose of manufacturing four-wheel drive vehicles for agricultural, industrial and utility applications.