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Why are alloys, manganin and constantan ...

Why are alloys, manganin and constantan used to make standard resistance coils ?

Text Solution

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Because their resistivity is high and temperature coefficient of resistance is extremely small.
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Knowledge Check

  • Assertion (A): The alloys manganin and constant on are used to make standard resistors. Reason (R) : Resistivity of nichrome is maximum amongst all alloys.

    A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
    C
    If assertion is true but reason is false.
    D
    If the assertion is false but reason is true.

  • The alloys constantan and manganin are used to make standard resistance due to they have

    A
    Low resistivity
    B
    High resistivity
    C
    Low temperature coefficient of resistance
    D
    Both (b) and (c)

  • Constantan wire is used in making standard resistance because its

    A
    melting point is high
    B
    density is high
    C
    specific resistance is low
    D
    temperature coefficient of resistance is negligible

    • Similar Questions

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    Why are constantan and manganin used for making standard resistances ?

    Why is Manganin one of the preferred materials to make standard resistances ?

    (i) Define the term drift velocity. (ii) On the basis of electron drift, derive an expression for resistivity of a conductor in terms of number density of free electron and relaxation time. On what factors does resistivity of a conductor depend ? (iii) Why alloys like constantan and manganin are used for making standard resistors ?

    Why alloys like constantun and manganin are used for making standard resistors?

    Constantan wire is used in making standard resistances, because its :–

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