why are alloys manganin constantan used to make standard resistance coil?
They are used to make standard resistors because
1)they have high value of resistivity.
2)temperature cofficient of resistance is less.
3)they are least affected by temperature.
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Alloys like constantan and manganin are used to make standard resistance coils because:
1. They have a very high value of resistivity.
2. They have a very small temperature coefficient of resistivity. Thus, their value of resistivity does not change even for very high values of temperature.
3. They are least affected by atmospheric conditions like, temperature, moisture, air, etc..
4. The contact potential of alloys with copper is very small.
1. They have a very high value of resistivity.
2. They have a very small temperature coefficient of resistivity. Thus, their value of resistivity does not change even for very high values of temperature.
3. They are least affected by atmospheric conditions like, temperature, moisture, air, etc..
4. The contact potential of alloys with copper is very small.
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Alloys like constantan and manganin are used to make standard resistance coils because:
1. They have a very high value of resistivity.
2. They have a very small temperature coefficient of resistivity. Thus, their value of resistivity does not change even for very high values of temperature.
3. They are least affected by atmospheric conditions like, temperature, moisture, air, etc..
1. They have a very high value of resistivity.
2. They have a very small temperature coefficient of resistivity. Thus, their value of resistivity does not change even for very high values of temperature.
3. They are least affected by atmospheric conditions like, temperature, moisture, air, etc..
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Alloys, such as manganin or constantan are used for making a standard resistance coil due to their low temperature coefficient of resistance and high resistivity. Due to which the resistance of the wire does not change with increase in temperature of the wire due to flow of current.
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