What is the resistivity of copper?
To "copper resistivity is how much" this issue, we first need to understand what is copper resistivity?
Copper resistivity is defined as: made of copper in the length of 1 meter, cross-sectional area is 1 square meter at room temperature (20 ℃) copper wire resistance.
"What is the resistivity of copper" has nothing to do with the length and cross-sectional area of the copper itself, but rather with the electrical properties of the copper itself.
There is a difference between "what is the resistivity of copper" and "what is the resistance of copper", so don't get confused. What is "copper resistance" we all understand, then what is "copper resistance"? The so-called copper resistance is to reflect the copper on the current impediment to the ability to size. The two are different concepts, I hope you do not confuse.
Then about the "copper resistance is how much" knowledge, I will immediately for you to introduce in detail:
In the introduction of "copper resistivity is how much" before we first want to introduce the definition of copper: copper is a concept in physics, refers to an alloy metal with high resistivity. Is 40% nickel, 1.5% manganese copper alloy.
"What is the resistivity of copper?" Let's talk about that later. Knowing the definition of copper, let's talk about the characteristics of copper resistivity: copper has a low temperature coefficient of resistivity and medium resistivity, and can be used in a wide range of temperatures.
After the introduction of the characteristics of the electrical resistivity of copper, let's talk about the physical properties of copper:
1, specific gravity 8.9;
2, melting point 1200-1260 °;
3, annealing temperature 800 - 820 °;
4, Boundary working temperature 350 °;
5, Resistance coefficient 0.48 ohm mm2/meter;
6, temperature coefficient 0.000016.
Now you can introduce what is the resistivity of Kang copper:
Properties / grades: Kang copper 6J40, new Kang copper 6J11
Resistivity m, 20 ℃: 0.48 ± 0.03, 0.48 ± 0.03
BMn40-1.5 is also a grade of Kang copper, then this Kang copper resistivity is how much?
Properties/Grade: BMn40-1.5
Resistivity (20℃)/uΩ-m: 0.480
So let's talk about the comparison between Kang Copper and Neo-Cang Copper:
1, Kang copper: brand number 6J40. resistance alloy in the copper-based category, is a copper-nickel as the main component of the resistance alloy. In the current measurement is often used for sampling, the stability of the current plays a very important role. Now the domestic technology of the temperature of the copper wire has been very mature, the temperature coefficient can be ± 40PPM.
Characteristics: temperature drift is very small, there is a wide range of use temperature (480 degrees below). Strong resistance to oxidation, excellent welding performance.
2, the new copper: alloy grade 6J11, copper-iron based with the alloy, raw material prices for copper wire 1 / 3, and copper compared to the temperature drift, can not be tin welding, electroplating nickel or tin.
3, Kang Copper and new Kang Copper identification: Kang Copper and new Kang Copper are white, the new Kang Copper weight is much lighter than Kang Copper.
Let's introduce the comparison between Kang Copper and Manganese Copper:
1, the use of temperature: the use of Kang copper temperature range of 0-400 ℃; manganese copper temperature range of 5-50 ℃.
2,Resistivity：Constantan's resistivity is 0.48±0.03 at 20℃; Manganese copper resistivity is 0.47±0.03 at 20℃.
3, the main components: copper with more nickel components accounted for 39% -41%, manganese content is very little 1% -2%; manganese copper is the opposite of more manganese elements accounted for 11% -13%, nickel content of 2% -3%.
4, price: because of the nickel content of copper, so the price of copper relative to manganese copper is much more expensive.
