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==Key Stage 3==
===Meaning===
An [[ammeter]] is a measuring device used to [[measure]] [[Electrical Current|electrical current]].
===About Ammeters===
: [[Ammeter]]s are added in [[series]] to a [[circuit]].
: An ideal [[ammeter]] has zero [[Electrical Resistance|resistance]] because otherwise adding an [[ammeter]] to a [[circuit]] would change the [[current]].