The Fuel Cell
A fuel cell converts the chemical energy of a fuel directly into electrical energy. A typical cell contains two metal screens separated by a layer of material saturated with an alkaline or acid electrolyte. Hydrogen is fed to one side of the electrolyte layer, oxygen to the other side. As the gases react with the electrolyte, a voltage is produced between the screens. The hydrogen and oxygen used by the fuel cell can be supplied to the cell for continuous operation.