Fuel Cell Technology..

Fuel cells are electrochemical devices that combine fuel with hydrogen and oxygen from the ambient air to produce electricity and heat, as well as water. 

In theory, a fuel cell will produce electricity as long as fuel is constantly supplied. 
The basic design of a fuel cell involves two electrodes on either side of an electrolyte. 

This is illustrated in a diagram given.Hydrogen and oxygen pass over each of the electrodes and through means of a chemical reaction, electricity, heat and water are produced. Hydrogen fuel is supplied to the anode (negative terminal), while oxygen is supplied to the cathode (positive terminal) of the fuel cell. Through a chemical reaction, the hydrogen is split into an electron and a proton. The electrons flow to the load producing electricity to the bulb. The protons passes through the electrolyte and both are reunited at the cathode. The electron, proton, and oxygen combine to form the harmless by product that is water.

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