Wirewound resistors have been electrical passive components which limit current with the wire material featuring high resistivity. Their resistive elements exist out of the metallic wire insulated that has been winded around the non-conductive material core.The resistive elements are existing out of metal wire that is insulated and winded around a non-conductive core material. Such resistors have been typically composed of copper-nickel-managese called as the “Manganin” or Nichrome materials (nickel-chromium). These kinds of resistors have been composed of manganese, nickel and copper. It also includes nickel-chromium or Nichrome materials. These wire wound resistors were actually the oldest types of resistors that were still manufactured nowadays. They could be produced highly accurate and got a very excellent properties of high power rating and low resistance value.
Construction of the wire wound resistors are depending on some factors. This actually involves manufacturing and selection of materials which depend upon the way that the resistor has been used in circuits. The value of the resistance depends on the wire resistivity, its length and its cross section. To obtain a high measurement in tolerance, the resistance value is measured to determine the exact wire length cut. In order to obtain a higher resistance, the wire diameter must become small enough and the length should be quite long.
The winding types were integrated in measurement device and decade banks, however, the drawback of these kinds of methods is more on difficulty in manufacturing process. Wirewound resistors come in distinct kinds. They were categorized into power type and the precision type. These have been modified to suit for various ranges of applications in current, potentiometers and temperature sensors.
Wire resistors are generally found in circuit breakers. At times, they also function as the fuse. In order to come up with fusible resistors, the manufacturers are going to integrate small springs into the other end of a resistor. Once the current and the heat through these resistors get too high, the solders are going to melt. This takes place when the springs popped up as the circuit opens.