NOVELTY - The method involves connecting two electrodes (122, 124) to a load such that electrical energy is output from the electrodes to the load when electrically polarizable material e.g. ferroelectric material, is in a portion of a thermal cycle of the electrically polarizable material. Thermal energy is extracted from combustion reaction, nuclear reaction, ocean water and the earth, recovered from industrial process, and generated from solar energy, where the thermal energy is transferred to the electrically polarizable material.    USE - Method for converting heat from a boiler to electric energy utilized for a vehicle such as electric vehicle and hybrid electric vehicle. Uses include but are not limited to a fire-tube boiler, a water-tube boiler, a sectional boiler and a flash boiler.    ADVANTAGE - The method enables ensuring that solar energy is converted to heat, and the heat is converted directly to electrical energy without an intermediate mechanical engine or electromagnetic generator, thus ensuring to generate electricity from lower temperature heat sources and ensuring that a higher combustion capacity can be obtained at a temperature below a limit of heat resistance, and size of a catalytic combustion apparatus can be reduced.    DETAILED DESCRIPTION - The combustion reaction is catalytic combustion reaction or reaction of fuel with oxidant. The oxidant is water. The fuel is selected from a group consisting of organic compound, hydrocarbon, hydrogen, aluminum, lithium and biomass. The nuclear reaction is nuclear fission reaction, nuclear fusion reaction or radioactive decay. The industrial process is selected from a group consisting of a chemical process, papermaking process, food production process, oil refining process, metal process, machinery production process, iron making process, steel making process, aluminum making process and cement manufacturing process. An INDEPENDENT CLAIM is also included for a vehicle comprising an apparatus for converting heat to electrical energy.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a ferroelectric device for converting heat to electric energy.    Ferroelectric layer (100)    Surfaces of ferroelectric layer (112, 114)    Electrodes (122, 124)    Heat exchangers (132, 134)    Electric leads (152, 154)