Why are alloys used to make standard resistors?
Answers
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
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:
Alloys are mixtures of metals or metals and different elements. positive other metals/elements may be introduced to the metals in specific ratios to form alloys to confer certain homes to metals or toughen a number of their present properties.
The properties of an alloy are special from the homes of the constituent metals:
Alloys are more potent than the metals from which they're made.
Alloys are tougher than their constituent metals.
Alloys are more immune to corrosion.
Alloys have decrease melting points than constituent metals.
Alloys have decrease electrical conductivity than pure metals.
Manganin is an alloy of copper (Cu), nickel (Ni), and manganese (Mn)
Constantan is an alloy of copper (Cu) and nickel (Ni).
Alloys like manganin and constantan are used for making trendy resistance coils as they have got excessive resistivity and a low-temperature coefficient of resistance.
consequently, those alloys are used for making wire-bound preferred resistors. Their resistance price would exchange very little with temperature.
In alloys, like constantan, atoms are in ailment so alloys have high resistivity.
Their extra ailment because of temperature growth is insignificant. this is why alloys haven't any temperature dependence of resistivity.
hence, alloys like manganin and constantan are used for making wellknown resistance coils as they have got high resistivity.
Why are alloys used to make standard resistors?
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