Chemical cells and Fuel cells.

• chemical cells produce a voltage until one of the reactants is used up.
• in a hydrogen-oxygen fuel cell hydrogen and oxygen are used to produce a voltage and water is the only product.
• What are the advantages of using fuel cells?

  Efficient, clean and renewable.
• What are the disadvantages of using fuel cells?

  It is expensive to store Hydrogen and Hydrogen is explosive which means that it could be unsafe.