Thermal energy.
Any fuel will do.
Chemical Energy is what is released.
potential chemical energy
energy of fuel cell
Nuclear energy is produced using uranium as a fuel. The energy produced is in form of heat energy which is used to produce electrical energy.
chemical potential energy (in the fuel being burned) to heat (thermal) energy and a little light energy.
chemical potential.
Fossil fuel.
Chemical energy (from burning the fuel)
The chemical energy in whatever fuel is burning.
An energy efficient car can use gasoline, diesel, CNG, or electricity as a fuel.