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==Key Stage 4==
===Meaning===
[[File:FuelCell.png|right|300px|thumb|A [[diagram]] of a simple '''fuel cell'''.]]
A '''fuel cell''' is a device which can combine [[Hydrogen]] and [[Oxygen]] to produce a [[Potential Difference]].
===About Fuel Cells===
: In a '''fuel cell''' [[Oxygen]] is combined with [[Hydrogen]] to produce [[Water]].
: '''Fuel cells''' are designed to combine [[Hydrogen Ion|Hydrogen ions]] and [[Hydroxide Ion|Hydroxide ions]] to produce a [[Potential Difference|potential difference]] between two [[electrode]]s.
: '''Fuel cells''' may be used in electric cars and were used on the [[Space Shuttle]].
===Advantages===
*No [[Carbon Dioxide]] is produced.
*Refilling with [[Hydrogen]] is quicker than recharging a [[battery]].
*They can be made in many different sizes for different uses.
===Disadvantages===
*[[Hydrogen]] must be stored as a [[Compressed Gas]].
*[[Hydrogen]] is highly [[flammable]].
*[[Hydrogen]] is made by [[electrolysis]] which requires [[electricity]], which is often made by power stations burning [[fuel]] and producing [[Carbon Dioxide]].