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Many electrical devices are based on electrical resistance and Ohms law, even if they do not have little components in them that look like the usual resistor. Take voltmeter for instance. A voltmeter is nothing more than an ammeter with an additional high-value resistor through which the current is also forced to flow. Ohms law relates the current through the resistor to the voltage difference across it, so the meter can be calibrated in units of volts based on the known value of the resistor. The voltmeters two probes are to...
Date：2019-05-30 [More+]
Resistors are the most basic passive component. It may seem like simple components with few applications, but resistors have a wide range of applications form factors and resistor types. Joule heating is the heat created as current passes through a resistor. Often this heat is an important factor in the selection of a resistor to ensure reliable operation, but in some applications, the purpose of the resistor is to generate heat. The heat is generated by the interaction with the electrons flowing through a conductor, impactin...
Date：2019-05-28 [More+]
Thick-film resistors best suit the application of linearity , temperature coefficient (TCR), and long-term stability under voltage stress. Their temperature characteristic is typically U shaped with limits expressed by the TCR, normally from 25 to 100 ppm/C. The TCR error can be reduced by choosing the highest-possible ohmic value, which lowers self-heating, and by designing layouts that avoid proximity to heat-generating components. The temperature coefficient of thick-film resistors typically exhibits a classic U shape. To ...
Date：2019-05-27 [More+]
Thick film chip resistor started to gain popularity in the 1970s. Today, these are by far the most used resistors in electrical and electronic devices. They come usually as chip resistor (SMD), and have the lowest cost compared to any other technology. The resistive material is a special paste with a mixture of a binder, a carrier, and the metal oxides to be deposited. The binder is a glassy frit and the carrier exists of organic solvent systems and plasticizers. Modern resistor pastes are based on oxides of ruthenium, iridiu...
Date：2019-05-27 [More+]
Sustainable and low-carbon power generation is in increasingly high demand, so electrical engineers have to be able to offer specific equipment and components for environmentally friendly applications. Microhm, manufactures and delivers high-power resistors for the renewable power industry, is experienced in producing resistors for generating, testing and controlling renewable power. We have developed a broad and extensive range of products to meet demand. Using solar power to generate electricity and hot water is a widely us...
Date：2019-05-27 [More+]
Precision resistors deliver the tight tolerances, low temperature sensitivity, and high stability demanded across a broad range of laboratory analysis equipment . The input stage of an instrument with a resistive sensor, such as a thermistor in a precision temperature-monitoring circuit, consists of a bridge of resistors, which must be closely matched in value. Since it is the ratio between values that matters rather than absolute values themselves, the maximum difference between TCRs (that is, the tracking TCR) is more impor...
Date：2019-05-24 [More+]
When the resistors are operated in ambient temperature above the rated temperature, the power rating must be derated according to the derating curve. Resistors in general may emit flame, fire, smoke or red heat when overload is applied. When a power exceeding the rated power is applied in a short time, we can not guarantee the safety only that the average power is below the rated power. Please contact Microhm with the surge voltage or current waveform for advise. Flame retardant resistors may emit smoke or cause red heat when...
Date：2019-05-24 [More+]
Current sense resistors are recognized as cost-effective components that help improve system efficiency and reduce losses due to their high measurement accuracy compared to other technologies. Global trends such as the demand for lower CO2 emissions, the smartening of the electricity supply grid and the electrification of our automobiles are all driving the need for electronic circuits to become more efficient. For circuit designers and systems operators, understanding what level of current is flowing through a circuit and be...
Date：2019-05-23 [More+]
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