How to distinguish copper wire from aluminum wire? The original title is: how do you distinguish the following substances in your daily life? (one of them is: aluminum wire and copper wire)

Color. Copper wire is red and yellow, aluminum wire is silver and white

Power and cable size calculation process, such as the total power of 240kw, with how much aluminum wire and how much copper wire can give the next process
A: I usually calculate it like this. When I know the power, I divide the power by the voltage to get the current. Then I divide the current by a constant of about 4-6a per square millimeter to get the cable diameter
B said: give you the most simple and fast algorithm, 1 square with 2 kilowatts~
Which one is right

The safe current carrying capacity of conductor per square millimeter is calculated as 5A. The safe current carrying capacity of conductor per square millimeter is calculated as 2A. The safe current carrying capacity of conductor per square millimeter is calculated as 2A. The safe current carrying capacity of conductor per square millimeter is calculated as 2A. The safe current carrying capacity of conductor per square millimeter is calculated as 4a. The safe current carrying capacity of conductor per square millimeter is calculated as 3a

A copper wire is 21 cm long and an aluminum wire is 16 cm long. Reduce the length of the two wires by the same length, so that the length of the remaining copper wire is exactly twice the length of the aluminum wire

Suppose we subtract the length of X
21-x＝2*（16-x）
x＝11

A copper wire is 2.1 meters long and an aluminum wire is 1.6 meters long. Cut off the two wires with the same length, so that the length of the remaining copper wire is exactly twice that of the aluminum wire
How many meters off each of the two lines?

The cut length is x m, the remaining copper wire is (2.1-x) m, and the remaining aluminum wire is (1.6-x) M
2.1-x=2(1.6-x)
x=1.1
Remaining copper wire 2.1-x = 2.1-1.1 = 1m
Remaining aluminum wire 1.6-x = 1.6-1.1 = 0.5m
A: the remaining copper wire is 1 meter, and the remaining aluminum wire is 0.5 meter

How to distinguish copper wire from aluminum wire? The original title is: how do you distinguish the following substances in your daily life? (one of them is: aluminum wire and copper wire)