Take a mobile phone charger, cut the outlet wire. Attach electrodes. Insert the two electrodes into separate plastic tubes in such a way that the plastic tube is connected a tube that can reach a modified stove with two inlets. Connect the charger to the mains. The hydrogen and oxygen gasses achieved through electrolysis should result in spontaneous combustion in the stove. The two wires after insertion in the polymer pipes should be dipped in plastic vessel holding water in such a way as to enable them to be dipped in water.
2. Do the same for a laptop charger but this time connect the gas outlets to a modified gas generator. See how much power can be generated.
Please do not try this experiment at home without expert supervision