Why do wires and coils become hot when electricity flows through them?

The heat is a by product of the current flowing through the wires and the coil windings. In a perfect world there would be no heat loss and the wires and coil would remain cool.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.