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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what is a standard resistance?
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Because constantan and magnin has the temp. Coefficient (alpha) very small therefore it cannot change its resistant with change in temp.
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These metals are used because they have high resistivity and low thermal coefficient of resistance. A standard resistance is one, which doesn't loose it's properties or dimensions with a significant change in temperature
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yes
 
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Because of their low value of temperature coefficient of resistance, i.e. the value of resistance doesnt change much with increase in temperature
 
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Even if we increase the temperature to an appreciable value the value of resistance is increased to a small amount
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High value of resistivity and constant value is less....
That is the perfect answer as mentioned in ncert..
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The Alloys shows very less change in resistance (alpha) on increasing temperature. i.e. resistance do not change unit temperature in alloys . Due to this property alloys are used as standard resistance
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because their resistance is not change by temperature
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hlo
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Considerable increase in temp due to continuous flow of current do not alter their resistance .
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Madharchod quest ion
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1 :- They have very high value of resistivity......2 :- They have a very small temp. Coefficientof resistivity
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thank you sir
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As they have high resistivity
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Due to its ;ZERO TEMPERATURE COEFFICIENT OF RESISTANCE VALUE.
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Because they show very little variation in resiatance with temperature.
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Because even in large difference in temperatures the resistance of these alloys doesn't change much
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They have high resistivity power and is proportional to area ( that is length of the instrument)
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They conduct electricity
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Conducts the electricity
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Please find this answer

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Because manganin have high resistivity and low temperature co-effecient
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Please find this answer

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These alloys are chosen to made standard resistance coils because there resistivities are insensitive to temperature
Temperature dependence of resistivity-

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they have very small value of temperature coefficient of Resistivity and also have very high value of resistivity
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a very small value of temperature coefficient of Resistivity and also have very high value of resistivity
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Because their resistivities are relatively intensive to temperature.
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Because in them they have High capacity to withstand high voltage of current . They can balance the current coming from the wires
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Because they have a high resistance and there resistance almost does not change with change in temperature.
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Because even though the temperature changes, resistance remains the same
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They are used to make standard resistors because

i)they have high value of resistivity.
ii)temperature cofficient of resistance is less.
iii)they are least affected by temperature.
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Because they have high resistivity .. so they can resist the change in their resistance due to temperature
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Because it has very low temperature coefficient.
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Please find this answer

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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.
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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..
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This is bcoz they have small temperature coefficient of resistivity,they are least affected by atmospheric conditions,have high value of resistivity and the contact potential of alloy with copper is very small
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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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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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Bcz they have high resistivity and low temperature coefficient .
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Bcz it's resistance is invest proportional ot temperature
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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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X + 4=7 x=3
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because they have high resistivity and has weak dependence on temperature
 
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1) The temperature coefficient of resistance for alloys is low.
2) alloys have has a high value of resistivity.
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For these alloys Alpha(?) is nearly equal to zero therefore with change in temperature there is negligible change in resistance by the formula
R = R?(1 + ??T)
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Because of high temperature of coefficient
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They are not affected by the temperature changes in the
Surrounding and resistance remains constant
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Because
They have high resistivity
They are not affected by the atmospheric condition
Their resistance is not temperature dependent
Their contact potential with copper is less
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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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Co efficient of temperature is almost equal to zero for maganin
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Please find this answer

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