Wirewound Resistors: Discovering More About Them

Shunt Resistor

RiedonThe wirewound resistors are an electrical passive component that has been limiting current. It is done through 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. Such wire wound resistors had been an old type of resistor. However, these have been still manufactured today. These may be produced very accurate and has excellent properties of low resistance values and high power rating.

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 resistance value varies on the resistivity of the wire including its length and even the cross section. To obtain a high measurement in tolerance, the resistance value is measured to determine the exact wire length cut. For higher resistance, wire diameter need to be small. When it comes to its length, it must be made long enough.

Pulse Resistor

RiedonWirewound resistors are known to naturally give both capacitance and inductance. These are affecting the current flow present in the alternative current circuits. Because of the design principles of a wire wound resistor, this obtain poor frequency properties in all resistor types. There have been various ways of applying the winding and they depend on the resistor application. Through the DC current, there will only be a few problems in terms of winding compared to the AC current due to the self induction and parasitic capacity. In order to reduce the effects, there have been various kinds of winding that exist and these are the Ayrton-Perry winding, winding on the flat former and bifilar winding.

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. There are many different kinds of wire wound resistors which are roughly classified into power and precision types. These are being modified for distinct ranges of applications in temperature sensors, potentiometers and current.

Wirewound Resistors

The wire resistor has been generally present in a fuse or in the circuit breaker. To achieve a fusible resistor, the manufacturer need to connect smaller springs. These springs must be integrated into the resistors’ one end. 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.