Why do electromagnetic relays use copper wires as wires instead of wires?
The resistivity of iron is high. After the current it will heat up a lot. And the conductivity and heat conduction of copper are also better. If you string iron in the line, you will find that he soon burns red
Copper wire resistance is small, small fever, wire resistance, fever.
Probably the following reasons: 1, iron resistivity than copper, aluminum are larger;2, iron corrosion resistance is poor, easy to rust;3, iron hardness is relatively large, not easy to bend;4, the wire will produce a magnetic field, the iron is a guide magnet, will produce hysteresis effect and eddy current effect, increase the loss, increase heat.
