The Ultimate Guide to Transistors

A Basic Guide to Wirewound Resistors

When it comes to power resistors, your options are many in this day and age. One of the oldest types of resistors that are still utilized today are wirewound resistors. All wirewound resistors are created similarly. Usually, a metallic wire is winded around the center of an insulating material. Despite the fact that they are created in the same manner, you can expect variations in the application of the different types of resistors. There are basically two kinds of wirewound resistors. You have precision wirewound resistors and power wirewound resistors. All of them can be used for a wide array of applications. They can be applied accordingly for current and temperature sensors.

The most common uses of precision wirewound resistors include measuring bridges and accurate calibration devices. Under one-tenth percent should be the tolerance of these very accurate resistors. In terms of temperature coefficient, precision wirewound resistors are better with 5 ppm/C than with most metal film resistors with 25 ppm/C. Their stability is fairly good where their values of 30 ppm alterations function at full power rating for twelve months. This is the kind of wirewound resistor that you need if you will be requiring temperature increases below 30C. For this reason alone, these wirewound resistors are often coated with epoxy materials.

Another kind of wirewound resistor is the power wirewound resistors. These wirewound resistors have a power range between 0.5 watts and 1000 watts. If you want to break down these power resistors by kind, you have to do so according to their coating type. When the lowest dissipation ranges, you have to go with silicone resins. They are known for being small resistors and can withstand temperature increases to a maximum of 300C above normal levels. Another type of power wirewound resistors is coated with porcelain enamel. It is only at low temperatures that this coating type will be able to offer good insulation properties. You can expect the insulation to be less when the temperature goes up. This is why they are not so common in terms of power resistors. 400 degrees is basically the maximum operating temperature for this type of coating. If you talk about their resistance values, they are within 0.1 and 10 kOhm.

You have another coating type for power wirewound resistors, and they are ceramic coating. This is the standard type of power wirewound resistor that is used. From these resistors, you will see that they have a ceramic coating and core to provide wire protection. This coating boasts of its good insulation properties and effective energy dissipation. Furthermore, its physical protection is also good. Their power ratings range between 5 and 18 watts. Even while warming up around three hundred degrees, this resistor will not have any problems at this range. Their resistance falls within the range of 10 and 20 kOhm.

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