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: To compare the '''[[Electrical Conductivity|conductivity]]''' of different [[object]]s an [[ammeter]] can be added to the [[circuit]]. The higher the [[Electrical Current|current]] the better the [[object]] is at '''conducting'''. ==Key Stage 4=====Meaning===An '''electrical conductor''' is a [[material]] with a very low [[Electrical Resistance|resistance]] to the flow of [[electricity]]. ===About Electrical Conductors===: [[Metal]] [[element]]s are good '''electrical conductors'''.: [[Metal]]s make good '''conductors''' due to the [[Metallic Bond|metallic bonds]] in which a sea [[Delocalised Electrons|delocalised electrons]] is free to move past a [[lattice]] of [[Positive Ion|positive]] [[metal]] [[ion]]s.: [[Non-metal]] [[element]]s are usually poor '''electrical conductors''' as [[electron]]s are not free to move from one [[atom]] to another. [[Carbon]] in the form of [[graphite]] is an exception to this.: [[Salt]]s that are [[molten]] or [[dissolve]]d in [[water]] are '''electrical conductors'''.: [[Salt]]s make good '''conductors''' when the [[ion]]s are free to move through the [[substance]].: To determine if an [[object]] is a good '''electrical conductor''' the [[object]] can be added to a [[circuit]]. If the [[ratio]] of [[Potential Difference|potential difference]] to [[Electrical Current|current]] is low then it is a good '''conductor'''.: To compare the '''[[Electrical Conductivity|conductivity]]''' of [[Electrical Component|components]] in a [[circuit]] an [[ammeter]] can be added in [[Series Circuit|series]] with the [[Electrical Component|component]] and a [[voltmeter]] in [[Parallel Circuit|parallel]] to the [[Electrical Component|component]]. The smaller the [[Electrical Resistance|resistance]] the better the [[object]] is at '''conducting'''. {| class="wikitable"|-|[[File:ResistanceComponent.png|center|500px]]|-| style="height:20px; width:200px; text-align:center;" |A [[Circuit Diagram|circuit diagram]] showing how to find the [[Electrical Resistance|resistance]] of an unknown [[Electrical Component|component]].|}