The working principle of wire wound resistor

Wirewound resistors with resistance wire around the insulating skeleton after insulation processing package and a resistor, as shown in the figure, the resistance wire generally use a resistivity of Ni Cr, Mn Cu alloy made insulation, the framework of the ceramics, plastics, coated insulating layer of the metal skeleton. With low temperature coefficient,high precision. Online in a winding resistor, a ceramic as a framework, the resistor of the outer layer of glaze or other heat-resistant and good heat insulating material of high power line wirewound resistors, such as large power dissipation is shown the wire wound resistor characteristics, up to hundreds of watts, mainly used as high power load, can work in 150 DEG C to 300 DEG C temperature environment.

Online in a winding resistor, and a can be adjustable wire wound resistor, it is online around the outside is provided with a mobile card ring as the leading out end of the contact, above the glaze paint layer and leaving a narrow window, exposing the winding contact and snap ring through a contact in the contact mobile you can adjust the resistance, so it is a variable resistor. There is a common wire wound resistor glaze and paint wirewound resistors two.