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Wirewound resistors are passive components used to control the flow of electrical current in a circuit. They are constructed by winding a metal wire, typically made of nickel-chromium or copper-nickel alloy, around a ceramic or fiberglass core. This design allows for high precision and stability in resistance values, making them suitable for various applications. Wirewound resistors are commonly used in power applications, where they can handle higher loads, and in precision measurement equipment due to their low temperature coefficient.
| Resistance range | 0.1 ohms to several megaohms |
| Power rating | 0.25W to 100W or more |
| Tolerance | 1% to 5% |
| Temperature coefficient | ±10 to ±100 ppm/°C |
| Construction material | Nickel-chromium or copper-nickel alloy wire |
| Core material | Ceramic or fiberglass |
When selecting wirewound resistors, consider the required resistance value, power rating, and tolerance for your specific application. It's important to specify the temperature coefficient if precision is critical. Additionally, inquire about the physical size and mounting style needed for your circuit design. If applicable, check for any required certifications or standards that may be relevant to your industry.
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They are used for precision applications and high-power circuits.
Typical tolerances range from 1% to 5%.
Yes, they can handle high temperatures, but the specific rating depends on the construction.
They are typically made from nickel-chromium or copper-nickel alloys.
Consider resistance value, power rating, tolerance, and temperature coefficient.
They are generally not recommended for high-frequency applications due to inductance.