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How to calculate the resistivity of aluminum clad steel
Two aluminum and steel conductors are connected in parallel and calculated according to the area ratio
What is the resistivity of 35m2 ACSR?
As the 2nd floor said, resistivity is a physical quantity to measure the conductivity of metal materials, which is determined by the properties of the materials and does not change due to external factors. For wires, it is "resistance". Resistivity divided by cross section equals resistance (of course, there are some coefficients). It is found in table E.2 on page 30 of GB / T 1179-2008 standard, The resistance of 35 / 8 ACSR (at 20 degrees) is not greater than 0.8230 ohm / km. This is the maximum value of the standard resistance, because the greater the resistance is, the worse the conductivity is. The actual resistance is required to be less than this value, for example, it may be 0.8030 ohm / km, 0.7910 ohm / km. The amount of the object must be measured by the resistance tester
Is the resistivity of copper 0.017241mm ^ 2 Ω / m or 0.01752mm ^ 2 Ω / m at 20 ℃? What is the formula for calculating the resistivity of copper at different temperatures?
The formula for calculating the resistivity of copper at different temperatures is
ρ=ρ0（1+αt）
When ρ 0 is 0 ℃, the resistivity of copper is 1.69 * 10 ^ (- 8) Ω M
α is the average temperature coefficient of copper: 3.9 * 10 ^ (- 3)
T is the temperature
Amol sodium and amol aluminum were put into m g water, the density of the solution was dg / ml, and the mass fraction of solute was ()
A:82A/46A+M% B:8200A/69A+M%
c；8200A/46A+M% D:8200/46A+2M%
From the reaction of 2Na + 2H2O = 2naoh + H2 -, 2Al + 2naoh + 2H2O = 2naalo2 + 3h2 -, we know that NaAlO2 amol is produced and H2 2amol is produced. From this, we can calculate the concentration of NaAlO2: the mass of solute is 82a, the mass of solution is 23a + 27a + m-4a = 46a + M
RELATED INFORMATIONS
- 1. When a mole of sodium and a mole of aluminum are put into m g of sufficient water, the density of the solution is d g / cm3, and the percent capacity of the solution is 0___
- 2. Molar mass problem When a certain amount of liquid compound XY2 is completely burned in a certain amount of oxygen, the equation is XY2 (L) + 3O2 (g) = xo2 (g) + 2yo2 (g). After cooling, the volume of the product is 672 ml and the density is 2.56 g / L under the standard condition?
- 3. How many moles of aluminum ions are there in 0.2 moles of aluminum sulfate
- 4. It is known that the density of iron is higher than that of aluminum, which indicates that the mass of iron and aluminum with equal volume is larger, and the volume of iron and aluminum with equal mass is larger
- 5. The mass ratio of C, O and h in an organic matter is 6:4:1. The relative density of vapor to air of the organic matter is 1, 518. The molar mass of the organic matter is calculated According to the title "the relative density of the organic matter vapor to air is 1, 518", the relative density of the organic matter is 44, and its molar mass is 44 Is molar mass equal to relative density?
- 6. The density ratio is equal to the molar mass of the substance How do you remember?
- 7. At a certain temperature, the density of the saturated solution of a substance with molar mass m is ρ, and the mass concentration of the substance is C? At a certain temperature, the density of the saturated solution of a material with a molar mass of M is ρ, and the mass concentration of the material is C. what is the mass fraction of solute in the solution? The answer of the exercise is (cm / 10 ρ)%, which is cm of 10 ρ, followed by a%,
- 8. The molar mass of copper is 63.5g/mol, and the density is 8.9 * 10 ^ 3kg / m ^ 3, It is estimated that the free electron number density of the copper dollar table is 4*10^28m^-3 I don't know how to get the answer
- 9. The density of copper is 8900 kg / M and the molar mass of copper is 0.064 kg / mol
- 10. A cuboid steel is 2 meters long and its cross section is a square with a side length of 5 cm. If there is 7.8 kg of steel per cubic decimeter, how much does the steel weigh Kilogram?
- 11. There is a bundle of wires of uniform thickness made of metal of density P. Xiao Ming measured its total length with a platform scale, pencil and scale Please help him write out the experimental steps and the mathematical expression of the total length of the wire
- 12. After the electric furnace is electrified, the electric furnace wire burns red, but the transmission wire connecting the electric furnace and the power socket is not hot. Why?
- 13. Why don't you use thick and straight wires for the furnace wire on the circuit?
- 14. Five equivalent resistors, if the equivalent resistance after series connection is 1K ohm, if they are connected in parallel, the equivalent resistance is 1K ohm____ Europe I hope you can do me a favor and help me analyze it
- 15. What is the resistance of 5.1k
- 16. A 5.1k resistor needs to be connected in parallel. How large is a resistor equal to 4.7K
- 17. 1K resistance connected to the two ends of 220V, equivalent to how many watts How to use in other voltage calculation, it is best to give a formula
- 18. How to calculate the resistance of two 10 ohm resistors in parallel?
- 19. The resistance values of two small bulbs L1 and L2 are 5 Ω and 10 Ω respectively. Connect them in series with a 6V power supply to calculate the current in the series circuit Speed, online, etc
- 20. 5. Bulbs L1 and L2 are connected in parallel in the circuit, and the power supply voltage applied to both ends of them is 12V. If L1 resistance is 8 Ω and L2 resistance is 4 Ω, the current passing through L1 is 8 Ω_