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Electricity

Scorching goIITian

Joined:	26 Mar 2009
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18 Jul 2009 16:39:04 IST

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how does temperature aaffect the resistance of a metal .. semiconductor and a mettallic wire ? do th

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how does temperature aaffect the resistance of a metal .. semiconductor and a mettallic wire ? do these increase or decrease with increase in temp.?

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~Áß???????

Blazing goIITian

Joined: 31 Aug 2008

Posts: 982

18 Jul 2009 17:09:34 IST

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FOR CONDUCTOR (metals ) .. - AS TEMP INCREASES RESISTANCE INCREASES ..

AND AT SOME VERY LOW TEMP ..some bcome superconductors

FOR SEMICONDUCTOR ...........AD TEMP INCREASES RESISTANCE DECREASES

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Killer Kiran

Blazing goIITian

Joined: 6 Aug 2007

Posts: 1860

18 Jul 2009 17:38:55 IST

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Conductors- resistance increases as temperature increase

reason-As the temperature increases, the atoms that make up the lattice structure of conductors start to vibrate more vigorously [over greater distances]. As a result of this, mobile electrons in the conductor may collide more often with vibrating ions. Hence an increase in electrical resistance. Picture this, it is easier to walk in a street where people are only standing around, but if its busy [like rush hour Delhi], you'll find it harder to make your way through the crowd.

Semi conductors - Resistance decreases as temperature increases

reason- more kinetic energy for the elctron to jump from valence band to conduction band.. so when tempearture increases.. more electrons are in conduction band and hence less resistance

Sagar Saxena

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Joined: 8 Oct 2008

Posts: 7221

20 Jul 2009 18:08:11 IST

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hello dear

i advice u to remeber the key sentence::

semiconductor::resistance decreases as temperature increases

metal or conductor::resistance increases as temperature increases

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