<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> In physics and electrical engineering, a conductor is an object or type of material that allows the flow of an electrical current in one or more directions . Materials made of metal are common electrical conductors . Electrical current is generated by the flow of negatively charged electrons, positively charged holes, and positive or negative ions in some cases . </P> <P> In order for current to flow, it is not necessary for one charged particle to travel from the machine producing the current to that consuming it . Instead, the charged particle simply needs to nudge its neighbor a finite amount who will nudge its neighbor and on and on until a particle is nudged into the consumer, thus powering the machine . Essentially what is occurring here is a long chain of momentum transfer between mobile charge carriers; the Drude model of conduction describes this process more rigorously . This momentum transfer model makes metal an ideal choice for a conductor as metals, characteristically, possess a delocalized sea of electrons which gives the electrons enough mobility to collide and thus effect a momentum transfer . </P>

When can an object be described as a conductor
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