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Constantan is a metal alloy made of 45 percent Nickel and 55 percent Copper, used chiefly in electrical instruments because of its constant resistance under variations of temperature.
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∙ 14y ago
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∙ 12y ago6.048 ohm meters
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Why are alloys constantan and Manganin used to make standard resistors?
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.
Why is constantan better than copper?
Better for what? Usually one material is better for some things, other materials for other things. The special feature of constantan is its low temperature coefficient for electrical resistance.
What change in resistivity if length is doubled?
Resistivity is a property of a substance, and doesn't depend on the dimensions of a sample. If the length of a conductor is doubled, then its resistance doubles but its resistivity doesn't change.
How do you convert conductivity to resistivity?
Conductivity is a measure of the ability of a substance to conduct electricity. Resistivity is a measure of how strongly a substance resists the flow of an electric current. So conductivity and resistivity are opposed to each other. A good conductor like copper has a low resistivity, and a good insulator like glass has a low conductivity and a high resistivity. Mathematically, conductivity and resistivity are inverses of each other, so it is quite easy to convert conductivity to resistance.
What is resistivity and what factor does it depend?
Electrical resistivity (also known as resistivity, specific electrical resistance, or volume resistivity) quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is theohm⋅metre (Ω⋅m)It defined as resistance offerde by a unit length and cross section area conductor.It depends on material used.it depends on relexation time and temperature.
Why are alloys constantan and Manganin used to make standard resistors?
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.
over what range of voltages does Nichrome wire follow Ohm,s law?
You can try to calculate the resistivity of nichrome? I mean the question is the resistivity of the material. Faughn, Jerry S., Raymond A. Serway. College Physics. Pacific Grove, CA: Thomson Learning Inc, 2003: 538. Resistivity: Constantan resistivity and temperature. Schlumberger Limited, 2007. The State Education Department. 2006 Edition Reference Table for Physical Science Setting/Physics. Albany, New York: DOE. 2006-2007.
Where is constantan used?
In many typical installations, it is used in strain gauges.
Why is constantan better than copper?
Better for what? Usually one material is better for some things, other materials for other things. The special feature of constantan is its low temperature coefficient for electrical resistance.
What is the resistivity of graphite?
The resistivity of graphite is 7.837 µΩm.
What is thermal resistivity of soils?
Resistivity is the opposite of conductivity. The thermal resistivity of soil is the degree to which soil impedes the flow of heat, or insulates against heat.
Do wires that have high resistivity have high conductivity also?
No. In fact it is the opposite. Conductivity is the reciprocal of resistivity so a high resistivity means low conductivity. peace.
What are the formulae of resistivity?
There is no 'formula' for resistivity. The resistivities of different conductors have been determined by experiment.
What change in resistivity if length is doubled?
Resistivity is a property of a substance, and doesn't depend on the dimensions of a sample. If the length of a conductor is doubled, then its resistance doubles but its resistivity doesn't change.
What is the value of resistivity of human skin?
The value of resistivity of human skin is 0.2 Ohm-meters
How do you convert conductivity to resistivity?
Conductivity is a measure of the ability of a substance to conduct electricity. Resistivity is a measure of how strongly a substance resists the flow of an electric current. So conductivity and resistivity are opposed to each other. A good conductor like copper has a low resistivity, and a good insulator like glass has a low conductivity and a high resistivity. Mathematically, conductivity and resistivity are inverses of each other, so it is quite easy to convert conductivity to resistance.
What is resistivity and what factor does it depend?
Electrical resistivity (also known as resistivity, specific electrical resistance, or volume resistivity) quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge. Resistivity is commonly represented by the Greek letter ρ (rho). The SI unit of electrical resistivity is theohm⋅metre (Ω⋅m)It defined as resistance offerde by a unit length and cross section area conductor.It depends on material used.it depends on relexation time and temperature.
