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===About Electrical Cells===
: '''Electrical cells''' contain a store of [[chemical]]s which can [[Chemical Reaction|react]] to produce a [[Potential Difference|potential difference]].
: In an '''electrical cell''' a [[Displacement Reaction|displacement reaction]] occurs between different [[metal]]s. The greater the difference between [[reactivity]] of the [[metal]]s the greater the [[Potential Difference|potential difference]] provided by the '''cell'''.
: The [[Chemical Reaction|reaction]] only takes place when there is a complete [[circuit]]. If the [[circuit]] is broken the [[Chemical Reaction|reaction]] will stop.
: Once all of the [[reactant]]s have been used, the '''electrical cell''' will stop providing a [[Potential Difference|potential difference]].