There is another way to explain this.
Heat is the movement of molecules, the hotter something is the more those molecules move, electrons are a physical thing, as they move through the circuit they occasionally smash in to molecules and destroy them, that generates heat, its the resistance part of the equation, the higher the voltage the more electrons are moving through the circuit the more opportunity to smash in to molecules, so more heat, resistance. and the more molecules are being destroyed, the degradation or breaking down of the circuit.
Only at absolute zero are those molecules completely still, minus 273c.