Some guys don’t like to be pushed around, and there’s organized resistance that can result in a great deal of heat.
No, we’re not talking about labor unions. Maybe an arbitrator can help with unions, but there’s nothing short of being superconductive that stops the electrons in wire current from causing resistance. Whenever electrons are forced to travel longer distances or through smaller wire, resistance goes up. Since there’s no chemical change to the wire, and no physical movement, the only other place for the electrical energy to go is other forms of energy.
(Again, apart from superconductors,) that energy includes heat. Sometimes it includes radiation such as light, for example in an incandescent lightbulb.
If there’s enough heat, the insulation on the wire will melt or even catch fire. Sometimes enough heat is generated the wire itself is melted. This is the reason you want to be very careful not to add more appliances to an electrical plug at home than the power (in watts) that the plug supports. Extension cords with several additional plugs can be very dangerous this way. Extra plugs do not = more power!
If an electrical cord plugged into house current becomes very warm: THERE’S A PROBLEM. If the cord for a device is warm no matter where it’s plugged in, then the problem is not with the electrical load, but with the device itself. It should be watched carefully whenever it’s in use. If it’s something that isn’t constantly watched while in use: Throw the electronic device away, or have it repaired.
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