Weak temperature dependant resistivity will help detect even slight fluctuations in current load and thus will help prevent damage to appliances

Introduction:
Wire bound standard resistors are commonly used in electrical circuits to provide a known and stable resistance value. Two materials that are widely used in wire bound standard resistors are Nichrome and Manganin. These materials are chosen for their specific characteristics, including their temperature dependence.

Explanation:
Temperature Independent Resistivity:
One of the key factors in selecting a material for use in wire bound standard resistors is its temperature dependence. Ideally, the resistivity of the material should remain constant over a wide range of temperatures. This ensures that the resistance value of the resistor does not change significantly with temperature variations.

Nichrome and Manganin:
Nichrome and Manganin are known for their very weakly temperature dependent resistivity. This means that their resistivity does change slightly with temperature, but the change is minimal. The resistivity-temperature relationship for these materials is relatively flat, indicating that the resistivity remains nearly constant over a wide temperature range.

Advantages of Weak Temperature Dependence:
The weak temperature dependence of resistivity in Nichrome and Manganin offers several advantages in wire bound standard resistors:

1. Stable Resistance: As the resistivity of these materials does not change significantly with temperature, the resistance value of the resistor remains stable. This ensures accurate and reliable performance of the resistor in various operating conditions.

2. Predictability: The weak temperature dependence allows for better predictability of the resistor's behavior. Designers can easily calculate and compensate for the slight changes in resistance due to temperature to ensure accurate circuit operation.

3. Wide Operating Range: The minimal change in resistivity with temperature allows wire bound standard resistors made from Nichrome or Manganin to be used over a wide temperature range without significant deviation from the desired resistance value.

4. Consistency: The weak temperature dependence also contributes to the consistency of resistance values across different resistors made from the same material. This consistency is crucial for precision applications where the resistance values need to be highly accurate and repeatable.

Conclusion:
In conclusion, Nichrome and Manganin are widely used in wire bound standard resistors due to their very weakly temperature dependent resistivity. This characteristic ensures that the resistance value of the resistor remains stable and predictable over a wide temperature range, making them suitable for various electrical circuits and applications.