Elektriese stroom: Verskil tussen weergawes

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== Stroom in 'n metaaldraad ==
In 'n soliede [[elektriese geleier|geleidende]] metaal is daar 'n groot aantal mobiele [[vrye elektron|vrye elektrone]]. Hierdie elektrone is aan die metaalraamwerk verbind maar nie tot enige indiwiduele atoom nie. Selfs sonder die toepassing van 'n eksterne elektriese veld, beweeg hierdie elektrone willekeurig rond as gevolg van [[termiese energie]];. daar Daar is egter geen netto stroom in die metaal nie, omdat die aantal elektrone wat vloei van een kant van 'n denkbeeldige vlak waardeur die draad loop na 'n ander kant daarvan in enige tydsinterval gelyk is aan die aantal elektrone wat in die teenoorgestelde rigting beweeg.
 
[[Beeld:Stranded lamp wire.jpg|thumb|'n Tipiese metaaldraad wat gebruik word vir elektriese geleiding is die gevlegde [[koper|koperdraad]].]]
 
 
 
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Given an imaginary plane through which the wire passes, the number of [[electron]]s moving from one side to the other in any period of time is exactly equal to the number passing in the opposite direction.
[[Image:Stranded lamp wire.jpg|thumb|A typical metal wire for electrical conduction is the stranded [[copper]] [[wire]].]]
When a metal wire is connected across the two terminals of a [[Direct current|DC]] [[voltage source]] such as a [[battery (electricity)|battery]], the source places an electric field across the conductor. The moment contact is made, the [[free electron]]s of the conductor are forced to drift toward the [[positive]] terminal under the influence of this field. The free electron is therefore the [[current carrier]] in a typical solid conductor. For an electric current of 1 ampere rate, 1 [[coulomb]] of [[electric charge]] (which consists of about 6.242 &times; 10<sup>18</sup> electrons) drifts every [[second]] through the imaginary plane through which the conductor passes.