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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. In the simplest form it consists of a tank containing brine or other electrolyte solution, in which electrodes are submerged to create an electrical load .
Original salt water dimmers mounted on the wall in the wings of Alexandra Palace Theatre. Salt water dimmers, which are an early example of liquid rheostats, were used in theatres after the introduction of electric stage lighting to control the brightness of the lights on stage.
Early examples of a rheostat dimmer include a salt water dimmer, a kind of liquid rheostat; the liquid between a movable and fixed contact provided a variable resistance. The closer the contacts to each other, the more voltage was available for the light.
A liquid rheostat (containing sodium carbonate solution) was provided to limit the current during start-up and pole-changing. The necessary connections were established using a drum controller. The necessary connections were established using a drum controller.
Liquid earthing resistor, 33 kV, 21 ohms, rated for 750 amps for 10 seconds, providing an earth path for the tertiary winding of a 275/132/33kV autotransformer. A common use in the electrical power generating and distribution industry is as a fault current limiter in the common neutral leg of large three-phase transformers and generators.
The current limitation during starting and switching was obtained through a liquid rheostat containing a 2% solution of sodium carbonate in water as electrolyte. The electrolyte was cooled by a heat exchanger which transferred heat to another liquid circuit containing fresh water.
Axial-lead resistors on tape.The component is cut from the tape during assembly and the part is inserted into the board. Size comparison of axial-lead resistors. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.
Pole changing and cascade (concatenation) working was used to allow two or four different speeds, and resistances (often liquid rheostats) were required for starting. In Italy freight locomotives used plain cascade with two speeds, 25 and 50 km/h (16 and 31 mph); while express locomotives used cascade combined with pole-changing, giving four ...