When water flows through the pipe, it is always affected by frictional resistance. When the free charge moves in a direction in the conductor to form a current, it is also hindered. Inside the metal conductor, there are both atoms and positively charged positive ions, as well as free electrons. Under the action of external power, when free electrons make directional motion inside the conductor, they collide with regularly arranged atoms and positive ions, and as a result, the directional motion of the electrons is hindered. The conductor, which blocks the passage of current, is called the resistance of the conductor.
Experiments have shown that the resistance of a conductor changes with temperature. As the temperature increases, the resistance of the metal will increase. The filament (tungsten wire) in the bulb, the temperature is only a few tens of degrees when not emitting light, the resistance is very small, reaching 2 000 ° C when the light is emitted, the resistance value of the filament is increased many times. When the bulb is used for a long time, the tungsten wire is easily broken, but the tungsten filament is broken most of the time when the lamp is turned on. This is because the filament temperature has not risen just after the lamp is turned on, and its resistance is relatively small. The current through the filament is much larger than when the light is illuminated. In 1911, the Dutch physicist Unnaus did an experiment: he cooled the mercury below minus 40 ° C and found that the resistance of mercury gradually decreased. When the temperature dropped to 4.173K (-268.977 ° C), he was surprised to find that the resistance of mercury suddenly disappeared.
Under extremely low temperature conditions, the resistance of mercury was “unmovedâ€. This discovery caused a sensation in the scientific community and attracted great attention. Later, it was discovered that some metals and alloys suddenly disappeared when the temperature dropped to a certain value. The phenomenon that this resistance suddenly disappears is called "superconductivity phenomenon", and the substance with superconductivity is called superconductor.
The discovery of superconductivity has opened up new areas for the exploration of energy conservation. Scientists are working hard to find superconducting materials with high critical temperatures to serve actual production.
Ceramic Heater is ued in controllable aural various heat treatment furnace,to avoid the contact of elding burning outcome or to avoid the corrosion of furnace gas to heating element.The process(the conversion of elding burning or electric energy) is put into refractory steel tube and let amount of heat radiate by wall of tube.This device is called as heater tube.
Twist and turn resistance wire in axial direction,that is,the single resistance wire is bended to U shape,then in series or parallel connection mutually.This kind of electrothermal heater tube is called bending resistance wire heater tube.This tube,because fall of screening of resistance wire,in intratubal upper surface load,can insure prolong life span.
Ceramic heating element is a heating element and the ceramic through high temperature sintering, fixed together made of a heating element, according to the body temperature level to adjust the size of the resistance, which can be constant temperature in the set value, not overheating, with Energy saving, safety, long life and other characteristics. This heater does not light at work, no open flame, no oxygen consumption, soft air supply, with automatic temperature function. PTC ceramic heater output power in the 800-1250 watts, you can freely adjust the temperature, no light consumption when working, with automatic switching devices, energy efficient, energy safe. PTC ceramic heater uses most of the bathroom in the bathroom heater and some small bedroom heating. The rainy season takes into account the relatively dry indoor air in the northern part of the winter, the part of the heating in the bedroom PTC ceramic heater and humidifier function together, the introduction of humidification heater, warm hot air with the humid air blowing together , People feel very comfortable, and almost no noise. As consumers continue to improve the demand on the market derived from the novel products - fireplace - to simulate the flame, ceramic heating, resulting in warm air, creating a warm European and American style (power up to 1800W). The new appearance of a PTC ceramic heater appearance and ordinary oil-like heater like, but the use of enamel heat sink. Features a heat sink, thin shape, a protective cover, the use of security. Some of the more advanced products used in the room with infrared remote control, regular shutdown, fall automatically power and heating and other functions, can be regarded as fully functional.
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