This morning a 1 - kw electric heater was switched on for one hour. Trace back as far as you can the various forms the energy had before it was used for heat. Assume a coal-fired power plant. Now trac

This morning a 1 - kw electric heater was switched on for one hour. Trace back as far as you can the various forms the energy had before it was used for heat. Assume a coal-fired power plant. Now trace the path the electric energy will take after it has been used for heat. What will be it’s unltimate destiny?