Small power resistors are usually made of carbon film encased in a plastic case, while high power resistors are usually wound wire resistors made by wrapping wire of high resistivity around the porcelain heart. If the resistance value of a resistor is close to zero ohms (for example, a large cross-section wire between two points), the resistor has no resistance to current, and the loop connected to the resistor is short-circuited with an infinite current. If a resistor has an infinite or large resistance, the loop connected to the resistor is considered open and the current is zero. The commonly used resistor in industry is between two extremes. It has a certain resistance and can pass a certain current, but the current is not as large as the short circuit. The current limiting action of a resistor is similar to that of a small diameter pipe connected between two large diameter tubes to limit the flow of water.
The traditional type of resistor, commonly abbreviated R, is a basic property of conductors, which is related to the size, material and temperature of conductors. Ohm's law said to him, I = V/R, R = V/I, then, the basic unit of resistance is the ohm, with Greek letters "Ω said," there are such a definition: conductor, plus a voltage on one ampere current of resistance. The main function of resistance is to block the flow of current. In fact, "resistance" refers to a property, and the resistance commonly referred to in electronics refers to a element such as a resistor. The master said to the disciple, "find a resistance of 100 ohms!" A resistor with a "resistance value" of 100 ohms, often referred to as ohm. Said resistance tolerance of the commonly used unit and thousand Ω (k), megohm
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Beijing key laboratory of arc plasma application equipment has recently been listed in the hospital, which will provide new technological means for waste incineration, solid and liquid waste disposal and new material preparation.
According to the introduction, the traditional waste incineration technology generally USES fluidized bed, mechanical grate, and other waste incinerators. Due to the low treatment temperature, the dioxins generated are extremely harmful to the environment. Due to its characteristics of high temperature, high efficiency, energy saving, environmental protection and controllable atmosphere, arc plasma is becoming a booming emerging technology in China. The technology will be able to make high temperature pyrolysis, hazardous waste and ash more than 1400 degrees Celsius in the melting process of the two together, can not only deal with municipal solid waste, also can effectively deal with traditional garbage incinerator is unable to process the asbestos, low radiation nuclear waste, polychlorinated biphenyls (PCBS) (PCBS), medical waste, such as special garbage, and to restrict the formation of dioxin-like toxicities content. In addition, the molten glass can be recycled to maximize the waste volume reduction and reduction.
Arc plasma application equipment after Beijing municipal key laboratory was founded, with 11 yuan in aerodynamics, plasma physics, and engineering thermal physics and so on comprehensive scientific research advantage of interdisciplinarity, with different categories of arc plasma gun as a technical means, to study the mechanism of arc plasma technology in the process and efficiency, for the arc plasma technology application in different industries to provide technical basis. |
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