What is the resistance of a copper wire with a length of 1m and a cross section of 1mm

What is the resistance of a copper wire with a length of 1m and a cross section of 1mm

There is a formula r = ρ s / L, where ρ is the resistivity of copper (I go to the book to check), s is the cross-sectional area of the wire, l is the length of the wire, these data are in international units!

What are the symbols of aluminum cable and copper cable?

Aluminum cable is indicated by "L" in its model;
Copper cable is represented by "t", which is generally omitted

Since two 70 cables can replace one 150 cable, why not replace one 150 cable with three 35 square cables? Anyway, the current carrying capacity is enough

The principle of parallel use of power cables is: generally, no more than 2 cables should be used in parallel, and no more than 3 cables should be used in short distance. It is strictly forbidden to use more than 3 cables in parallel, because the safety will be seriously reduced
In addition, there is an important principle for parallel connection of cables: the type and specification of cables must be consistent, and the length must be equal (that is, the transmission impedance must be equal, otherwise the flow rate of each cable will be inconsistent, resulting in serious heating of cables with large flow rate, increasing the risk of insecurity)
In the case of laying in the air, through the pipe (iron pipe, PVC pipe), how many cables, the current carrying capacity will be inconsistent. If the number of cables in the pipe is more, the allowable current carrying capacity will drop greatly, so the actual current carrying capacity must be corrected according to the correction coefficient

How to connect a 150 square cable 200 meters long and a 35 square cable from the middle
How to connect a 4 * 150 + 1 * 70m2 cable 200m long to 25 cables (25 storey building) 3 * 35 + 2 * 16m2

Use the equipment clamp to jump directly. It's sold in the electricity market

Which of the two 95m2 four core cables is more safe than the single 185m2 four core cable

A 185 square contact point is connected, so it is larger than two 95 square contacts

What is the current carrying capacity of a 35 square meter cable?

Experience estimates that aluminum core is generally calculated as 3-5a per square meter, while copper core is generally calculated as 5-8a per square meter

100kW with how big leakage switch ah. How to calculate ah, there is a formula

Whether it is three-phase or single-phase, the current of three-phase 100kW is about 200A, and that of single-phase 100kW is about 450A

Resistance value of 0.51mm copper wire

85.9 ohm / km

How to identify wire and copper wire, grade three chemistry problem, urgent!

It's my honor to answer:
Method 1: put iron wire and copper wire into dilute hydrochloric acid or dilute sulfuric acid respectively
Method 2: put them into the copper chloride solution, the red solid on the surface of wire is iron wire
Method 3: magnetite, no explanation
Method 4: color reaction, copper wire is green
There are many methods, and the above are more convenient. I hope it can help

Put aluminum wire, iron wire and copper wire into dilute sulfuric acid. What are the phenomena on the surface?

The first two: there are bubbles, metal gradually disappear. Copper: no obvious phenomenon