Why is manganin used for making standard resistors?
QUESTION:
Why is manganin used for making standard resistors?
ANSWER:
For standard resistors, resistance should be a constant value at different temperatures. In case of Manganin temperature coefficient of resistance is very less. So its resistance is almost constant over a wide range of temperature. Due to this reason Manganin is used to prepare standards resistances.
Note:
Temperature coefficient of resistance α is the ratio between change in resistance per unit resistance and per unit change in temperature.
