what opposes the flow of electrons in a conductor
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Resistance opposes the flow of electrons in a conductor..
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Resistance opposes the flow of electrons in a conductor. When the electrons drift through the metallic conductor when current is supplied, they collide with the fixed positive ions and with themselves which reduces their speed. They then again speed up and they again collide and this goes on and on.
Causes of resistance in a conductor:
1) Length: Resistance is directly proportional to length. More the length, more will be the collisions and hence, more the resistance.
2) Area: Resistance is inversely proportional to area. More the area, lesser the collisions and hence, less is the resistance.
3) Temperature: Resistance increases with the increase in temperature. This is again due to two reasons.
i) Increase in length(expansion) on heating.
ii) Increase in temperature increases the specific resiativity of a conductor which increases the resistance.
We also have an equation to show the dependence of resistance.
R = Specific resistance x length/ Area.
Causes of resistance in a conductor:
1) Length: Resistance is directly proportional to length. More the length, more will be the collisions and hence, more the resistance.
2) Area: Resistance is inversely proportional to area. More the area, lesser the collisions and hence, less is the resistance.
3) Temperature: Resistance increases with the increase in temperature. This is again due to two reasons.
i) Increase in length(expansion) on heating.
ii) Increase in temperature increases the specific resiativity of a conductor which increases the resistance.
We also have an equation to show the dependence of resistance.
R = Specific resistance x length/ Area.
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