Resistors offer opposition to the flow of current. Hence, the electric energy is dissipated in the form of heat.
Resistance coils are used to produce the heating effect of the current, hence they need the material of high resistance and low-temperature sensitivity.
Alloys have a high resistivity and a very small temperature coefficient (temperature sensitivity). Hence, they are used for making standard resistance.
Alloys like manganin, nichrome, etc. are used in the manufacture of resistors, particularly ammeter shunts, because of their virtually zero temperature coefficient of resistance and long-term stability.
Standard resistance coils are made from alloys like manganin and constantan because of their essentially temperature-independent properties.
Hence, standard resistance coils are made from alloys like manganin and constantan because of their high resistivity and low-temperature coefficient of resistance.
Alloys are used for making standard resistance coils because they have high value of resistivity and a very small temperature coefficient of resistivity.
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Hence, standard resistance coils are made from alloys like manganin and constantan because of their high resistivity and low-temperature coefficient of resistance.
Verified answer
Answer:
Alloys are used for making standard resistance coils because they have high value of resistivity and a very small temperature coefficient of resistivity.
Explanation:
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