Moving electrons
2008-06-16 1:52 am
When a current is conducted, is it true that the electrons only move at the outter layer of the metal? Why? Is it because of this, a thicker wire, increase circumferance, make the electrons easier to travel therefore less resistance? Thanks.
回答 (3)
2008-06-19 10:30 am
✔ 最佳答案
i think the density of electrons in conduction band is quite uniform, and not move at the outter layer. Because the positive ion background just cancel the columbic interaction.increasing the thickness = increase the charge flux when applying the same voltage, thus lowering the resistance.
2008-06-22 10:35 pm
補充一下， charge flux 的意思，是電流的流量
imagine 10 athlete running on a field court, and are going to pass through a [gate]
if just 2 lane, each time the [flux] is 2, it is slower for all of them to pass,
if there is 5 lane, the [flux] becomes 5, they can finish with just two unit of time
imagine 10 athlete running on a field court, and are going to pass through a [gate]
if just 2 lane, each time the [flux] is 2, it is slower for all of them to pass,
if there is 5 lane, the [flux] becomes 5, they can finish with just two unit of time
2008-06-16 2:52 am
Like charges repel. Free electrons are thus more abundant at metal surface.
Increasing the thickness of a wire defintely would decrease the resistance because more surface area for electrons to flow.
Increasing the thickness of a wire defintely would decrease the resistance because more surface area for electrons to flow.
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