NOVELTY - A hydrogen generating apparatus has an electrolyzer (210) with an aqueous electrolyte solution (215); a first electrode (220) submerged in the solution and generating electrons; a second electrode (230) submerged in the solution and receiving electrons to generate hydrogen; a variable resistance (530) between the two electrodes; a flow rate meter (510) measuring an amount of hydrogen generation; and a variable resistance controller (520) comparing the measured amount of hydrogen generation with a received set value, and controlling a resistance value of the variable resistance.    USE - Hydrogen generating apparatus for a fuel cell power generation system (claimed).    ADVANTAGE - The hydrogen generating apparatus can control the amount of generation of hydrogen supplied to the fuel cell.    DETAILED DESCRIPTION - A hydrogen generating apparatus comprises an electrolyzer (210) filled with an aqueous electrolyte solution (215); a first electrode (220) accommodated in the electrolyzer, submerged in the aqueous electrolyte solution, and generating electrons; a second electrode (230) accommodated in the electrolyzer, submerged in the aqueous solution, and receiving the electrons to generate hydrogen; a variable resistance (530) located between the first and second electrodes; a flow rate meter (510) measuring an amount of hydrogen generation in the second electrode; and a variable resistance controller (520) receiving a set value, comparing the amount of hydrogen generation measured by the flow rate meter with the set value, and controlling a resistance value of the variable resistance. The variable resistance controller is inputted with the set value directly from a user through an input unit or a fuel cell being coupled to the hydrogen generating apparatus. The variable resistance controller decreases the amount of hydrogen generation by increasing a resistance value of the variable resistance or increases the amount of hydrogen generation by decreasing a resistance value of the variable resistance. INDEPENDENT CLAIMS are included for:    (1) a fuel cell power generation system, comprising the hydrogen generating apparatus; the fuel cell; and a load; and n    (2) a method of inputting an amount of hydrogen generation in the hydrogen generating apparatus controlling an amount of hydrogen generation by controlling a resistance value of the variable resistance located between the electrodes.    DESCRIPTION OF DRAWING(S) - The drawing is a block diagram of the hydrogen generating apparatus.    Electrolyzer (210)    Aqueous electrolyte solution (215)    First electrode (220)    Second electrode (230)    Flow rate meter (510)    Variable resistance controller (520)    Variable resistance (530)