NOVELTY - Electrical power generator (10) comprises at least one fuel cell (14) comprising a water vapor permeable electrolytic membrane and capable of generating electricity and fuel cell water at the cathode by the reaction of hydrogen gas and oxygen gas; at least one fuel chamber (12) containing a fuel substance (44) which reacts with water vapor to generate hydrogen gas; at least one air inlet for admitting atmospheric air into the housing; and a water retention zone (22) within the housing extending from the air inlet to the fuel cell cathode.    USE - For producing electrical power at 1 muWatt to 100 milli Watts, and for powering miniature devices e.g. wireless sensors, cellular phones or other hand held electronic devices.    ADVANTAGE - A fuel cell reaction of hydrogen and oxygen produces electrical energy as well as by-product water that diffuses back into the power generator as water vapor to react with the hydrogen fuel, producing more hydrogen gas. This generated hydrogen gas is then used as a fuel which allows the fuel cell to generate additional electrical power and additional water. The process runs without any attached water source or water supply other than the water which is produced by the fuel cells themselves.    DETAILED DESCRIPTION - Electrical power generator (10) comprises:    (a) a housing;    (b) at least one fuel cell (14) mounted within the housing, and comprising a water vapor permeable electrolytic membrane positioned between an cathode and a anode, which fuel cell is capable of generating electricity and fuel cell water at the cathode by the reaction of hydrogen gas and oxygen gas;    (c) at least one fuel chamber (12) mounted within the housing, and containing a fuel substance (44) which reacts with water vapor to generate hydrogen gas;    (d) at least one air inlet for admitting atmospheric air into the housing;    (e) a water retention zone (22) within the housing extending from the air inlet to the fuel cell cathode, which zone deters the diffusion of generated fuel cell water out of the air inlet; and    (f) a cavity (24) within the housing extending from the fuel cell to the fuel chamber, which admits a flow of hydrogen gas from the fuel chamber to the fuel cell, and which admits a flow of water vapor from the fuel cell to the fuel chamber.    A porous vapor membrane (34) permeable to both hydrogen gas and water vapor is attached to the housing. A pneumatic valve (26) is positioned in the cavity for regulating the passage of hydrogen gas from the fuel chamber to the fuel cell. An oxygen permeable, water vapor impermeable membrane is united with the air inlet. An INDEPENDENT CLAIM is included for a process for producing electrical power.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional schematic representation of a power generator.    Electrical power generator (10)    Fuel chamber (12)    Fuel cell (14)    Water retention zone (22)    Cavity (24)    Pneumatic valve (26)    Porous vapor membrane (34)    Fuel substance (44)